How to check stale stats in oracle

x2 Automated statistics collection eliminates many of the manual tasks associated with managing the query optimizer, and significantly reduces the chances of getting poor execution plans because of missing or stale statistics. However, Oracle will re-generate these statistics in order on objects believes need it the most, and it only has a certain ...SQL to check Stale statistics Many times Oracle SQL plan get change which will cause abnormal behavior, most probable reason could be stale statistics marked by Oracle. Below is useful queries to identify the Objects and gather stats for those Objects. Oracle do have auto jobs which takes care stats gather requirement in defined Windows.Oracle Optimizer Statistics Advisor in Oracle Database 12.2.0.1. The Oracle Optimizer Statistics Advisor in Oracle Database 12.2.0.1 is something I planned to write about for quite a while. Roy and I include this topic in the New Features section in our Upgrade / Migrate / Consolidate to Oracle Database 12.2 slide deck for some time.Oracle implicitly determines which objects need new statistics, and determines how to gather those statistics. When GATHER AUTO is specified, the only additional valid parameters are stattab, statid, objlist and statown; all other parameter settings are ignored.Check the Information of Statistics table in Oracle. NUM_ROWS: Number of rows present in object. LAST_ANALYZED : Date when last stats gather or analyzed. USER_STATS: If user entered stats then value will be YES otherwise NO. NUM_ROWS: Number of rows present in object. LAST_ANALYZED : Date when last stats gather or analyzed.(stale stats) Check statistics for both tables/indexes should not be Stale and PCT analysed must be greater than 10%atleast. Check fragmentation it should not be more than 80 % if it is try to rebuild the table/index. Also check for clustering factor as well. c) Check the data Volume differences for the job/ Sql which may be causing plan changeUsername: raj/[email protected] Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options Master table "RAJ"."SYS_IMPORT_TABLE_01" successfully loaded/unloaded Starting "RAJ"."SYS_IMPORT_TABLE_01": raj/*****@orcl dumpfile=stats.dmp ...10. SQL Health Check 11. SQL Plan Flip 12. Find Stale Stats 13. Gather Stats 14. PIN Optimal Plan 15. Find Fragmentation 16. De-Fragmentation _____ 1. Flow Chart *** Please click on each box in flow chart below to take you to respective script section. 2. Logon to Database Note that if autovacuum is not gathering stats reliably, you should consider changing autovacuum settings to be more aggressive (by default, autovacuum will limit its activity to avoid interfering with your query workload, but if it's de-prioritizing itself too much you may have chronically stale statistics and runaway dead tuple bloat, which can affect performance).Starting from Oracle 10g, Oracle introduced an automated task gathers statistics on all objects in the database that having [stale or missing] statistics, To check the status of that task: SQL> select status from dba_autotask_client where client_name = 'auto optimizer stats collection';ANALYZE INDEX. The next way the ANALYZE command is used is to analyze an index. There are actually two versions of this command, ANALYZE INDEX and ANALYZE TABLE FOR ALL INDEXES. When you use this command, Oracle calculates information about the B-tree depth and the distribution of leaf and branch blocks.Due to Oracle bug 19897084, you must make sure that the oratab contains the corresponding entry for the database you want to upgrade, <DBSID>:<Oracle_home>:N. This is especially necessary if you run DBUA in non-silent mode. (AUTOFIXUP) Gather stale data dictionary statistics prior to database upgrade in off-peak time using: EXECUTE DBMS_STATS.GATHER_DICTIONARY_STATS; Dictionary statistics do not exist or are stale (not up-to-date). Dictionary statistics help the Oracle optimizer find efficient SQL execution plans and are essential for proper upgrade timing ...DBMS_STATS package was introduced in Oracle 8i and used to gather Database,table,Schema,dictionary and fixed object statistic in Oracle database. Statistic of objects should be up to date in Oracle database for Oracle optimizer. Because Oracle optimizer uses database statistics to generate lots of execution plans in same time and If statistics ...A well maintained database is required for Blue Yonder applications to perform well. Recommendations are to rebuild all indexes once per week and gather statistics daily. Goal is to avoid indexes/stats from being declared as "STALE" by Oracle and the execution plan for queries changing to less optimal plans.sql execute the command dbms_session.set_sql_trace_in_session (sid, seria#, FALSE); This will generate a .trc file in the database's trace directory. 2. Get the session trace file. Trace file lives on database server. 3 Steps to get it: 2a: figure out the database server host name you are connecting.Overview. Oracle's cost-based optimizer (COB) uses statistics to calculate the selectivity (the fraction of rows in a table that the SQL statement's predicate chooses) of predicates and to estimate the "cost" of each execution plan.The COB will use the selectivity of a predicate to estimate the cost of a particular access method and to determine the optimal join order.In Oracle 11g we have option to put newly collect stats in pending state and published latter once satisfied by performance testing based on new statistics. In 10g we have face performance issue when collected stats on OLTP (24 X 7 ) database, probably because stats of one index/ table published before other.Several mechanisms are available to refresh server statistics including the ANALYZE command, the DBMS_UTILITY package and the DBMS_STATS package. The DBMS_STATS package allows you to refresh only those statistics that are out of date, or stale. Hi everybody, A new week, almost a new month, and for all of you, a new article. This will be so much more objective, but, I believe will help a lot of dba's.Media Speed Running: 1000 Mbps Full Duplex. Question : How to get network statistic of ethernet adapter in AIX. Answer : "entstat -d <interface>" command can be used to display statistic of specific ethernet adapter in AIX. Alternative, "netstat -v" command can be used to display statistic of all ethernet adapter in AIX.Starting from Oracle 10g, Oracle introduced an automated task gathers statistics on all objects in the database that having [stale ormissing] statistics, To check the status of that task: SQL> select status from dba_autotask_client where client_name = 'auto optimizer stats collection';To see if Oracle thinks the statistics on your table are stale, you want to look at the STALE_STATS column in DBA_STATISTICS. If the column returns "YES" Oracle believes that it's time to re-gather stats. However, if the column returns "NO" then Oracle thinks that the statistics are up-to-date. How do you resolve stale stats in Oracle?The relevant call using brconnect (see 863811) is as follows: brconnect -u / -c -f stats -t oradict_stats. Create the statistics when the database is carrying a typical and representative load. Deleting dictionary statistics: The commands for deleting Oracle dictionary statistics are as follows: SQL>begin.Patching Oracle Enterprise Manager 13c Release 4 Update 12 For OMS And Weblogic; Patching Oracle 19c Grid Infrastructure for a Standalone server-Oracle Restart; Apply Patching 32904851 Oracle 19c Database Release Update 19.12...0; Oracle Database Critical Patch Update Advisory - July 2021; Oracle Database Security Assessment Tool-Version 2.2.2Oracle Application Integration Architecture (AIA) Foundation Pack 11gR1: Essentials Book Released. The book "Oracle Application Integration Architecture (AIA) Foundation Pack 11gR1: Essentials" has been released. Having been one of the reviewers for this book, I can easily say that this is the book for those who want a head start on Oracle AIA!You should carry out your own virus checks before opening the e-mail or attachment. Infosys reserves the right to monitor and review the content of all messages sent to or from this e-mail address. Messages sent to or from this e-mail address may be stored on the Infosys e-mail system.DBMS_STATS package was introduced in Oracle 8i and used to gather Database,table,Schema,dictionary and fixed object statistic in Oracle database. Statistic of objects should be up to date in Oracle database for Oracle optimizer. Because Oracle optimizer uses database statistics to generate lots of execution plans in same time and If statistics ...How to Enable or Disable Automated Statistics Collection in Oracle Database. by admin. What kind of statistics do the Automated tasks collect? The statistics jobs automatically gather Missing and Stale statistics on tables, indexes and partitions for use by the Cost Based Optimizer (CBO) in determining the most optimal access paths for queries. ...Apr 08, 2011 · When you issue GATHER_TABLE_STATS with GATHER STALE, the procedure checks the USER_TAB_MODIFICATIONS view. If a monitored table has been modified more than 10%, then statistics are gathered again. The information about changes of tables, as shown in the USER_TAB_MODIFICATIONS view, can be flushed from the SGA into the data dictionary with the ... Therefore, Oracle will automatically estimate the sample size, detect skewed columns that would benefit from histograms, and refresh the schema statistics when they become stale. You can disable automated statistics collection job using the code below: Using the REST API to add a new Oracle DB monitor: Click here. Follow the given steps to create a Oracle database server monitor: Click on New Monitor link. Select Oracle DB Server. Enter the IP Address or hostname of the host. Enter the Subnet Mask of the network. Enter the port number in which the Oracle is running. Enter the polling interval ...Note ID 419728.1: Concurrent Processing - How To Gather Statistics On Oracle Applications Release 11i and/or Release 12 - Concurrent Process,Temp Tables, Manually. Note ID 394555.1: FND_STATS concurrent program does not PICK UP seemingly properly REGISTERED CUSTOM SCHEMAS. Note ID 228186.1: Differences between GATHER STALE and GATHER AUTORecently a customer raised a question whether there are differences between the Automatic Statistics Gathering job and a manual creation of stats via the GATHER_SCHEMA_STATS procedure.. The results in performance were quite interesting. Performance after an upgrade from Oracle Database 11.2.0.3 to Oracle Database 11.2.0.4 was not good when the automatic stats job got used.Since Oracle 12c, table statistics are gathered automatically for some bulk operations. This inconspicuous new feature called "Online Statistics Gathering for Bulk Loads" is very practical for ETL jobs in Data Warehouses.I remember an interesting discussion during Oracle OpenWorld 2009 in the Thirsty Bear Pub in San Francisco. Thanks to my Trivadis colleague Chris Antognini, we…In case data are being modified / purged which result in significant change to the datashape, manually stats collection is necessary. When investigating slow SQL, use SQL trace or capture execution plan for detailed analysis, for example, check if the sub-optimal operation is related to stale / unrepresentitive stats.In Oracle 11g we have option to put newly collect stats in pending state and published latter once satisfied by performance testing based on new statistics. In 10g we have face performance issue when collected stats on OLTP (24 X 7 ) database, probably because stats of one index/ table published before other.The "dark art" of SQL Server has just gone wrong, as we have stale statistics! Opening the "Statistics" section of the table within the Object Explorer shows tons of them. A thought goes through your head, "Why does SQL Server create so many statistics automatically". Well, that's the least of our problems at this point in time.Check any critical table statistics became stale select count(*),owner from dba_tab_statistics where stale_stats='YES'; Make sure that no highly accessed tables are in stale stats and gather the stats if any.Using the REST API to add a new Oracle DB monitor: Click here. Follow the given steps to create a Oracle database server monitor: Click on New Monitor link. Select Oracle DB Server. Enter the IP Address or hostname of the host. Enter the Subnet Mask of the network. Enter the port number in which the Oracle is running. Enter the polling interval ...Check any critical table statistics became stale select count(*),owner from dba_tab_statistics where stale_stats='YES'; Make sure that no highly accessed tables are in stale stats and gather the stats if any.Jan 11, 2021 · statistics of objects of a specific sql id: set lines 300 set pages 300 col table_name for a40 col owner for a30 select distinct owner, table_name, STALE_STATS, last_analyzed, stattype_locked from dba_tab_statistics where (owner, table_name) in (select distinct owner, table_name from dba_tables where ( table_name) in ( select object_name from ... Incremental statistics reduce the time to gather global statistics for a partitioned table. Really? In some situations it may happen that incremental statistics slow down statistics calculation dramatically. An example of a real project in Oracle 12.1 and how it can be improved with Oracle 12.2.Gathering global statistics of a partitioned table is time-consuming.Indeed, the spinand_mtd_read() call was incrementing the ecc_stats counters depending on the outcome of spinand_check_ecc_status() directly. So now let's split the logic like this: - spinand_check_ecc_status() is specific to the SPI-NAND on-die engine and is kept very simple: it just returns the ECC status (bonus point: the content of this ... Oracle EBS Database clone using RMAN; How to stop and start redo transport in oracle Dat... Query for sanity check in Primary and Standby Orac... Sending mail in Linux using mutt; How to check Oracle ASM Diskspace; Oracle Notes for platform migration from EBS 11i t... Oracle Data Pump Performance Tuning; How to move SQL Profile from one ...In case data are being modified / purged which result in significant change to the datashape, manually stats collection is necessary. When investigating slow SQL, use SQL trace or capture execution plan for detailed analysis, for example, check if the sub-optimal operation is related to stale / unrepresentitive stats.If you want to update statistics using T-SQL or SQL Server management studio, you need ALTER database permission on the database. See the T-SQL code example to update the statistics of a specific table: UPDATE STATISTICS <schema_name>.<table_name>. Let us consider the example of updating the statistics of the OrderLines table of the ...(AUTOFIXUP) Gather stale data dictionary statistics prior to database upgrade in off-peak time using: EXECUTE DBMS_STATS.GATHER_DICTIONARY_STATS; Dictionary statistics do not exist or are stale (not up-to-date). Dictionary statistics help the Oracle optimizer find efficient SQL execution plans and are essential for proper upgrade timing ...Dec 30, 2013 · In 07/11/2012 my theme of: “Orneklerle Oracle 11g R2 ve Genel Kavramlar / Oracle 11g R2 General Concepts with Examples ” was published as a book. The book was published: 07.11.2012, edition 356 copies, order was 50. “This books was freely distributed to the Oracle beginners in Turkey and Azerbaijan” Aug 15, 2015 · How Oracle decide if the stats has become stale. Stats are considered stale when #(INSERTS + UPDATES + DELETES) >= 10% of NUM_ROWS from dba_tables: Parameter setting required to Track the table changes. Prior to Oracle 10g, automated collection of statistics for objects that had become stale was controlled by the setting of the MONITORING flag on table. In conclusion, implicit index statistics gathering through, for example index creation or rebuild, doesn't set STALE_STATS. A subsequent gather empty schema statistics then wrongly sets the index STALE_STATS to 'YES'. Updates. January 14, 2016 - Oracle filed the Bug 22544615 : GATHER EMPTY OPTION OF GATHERING STATS MARKS THE INDEX STALEPatching Oracle Enterprise Manager 13c Release 4 Update 12 For OMS And Weblogic; Patching Oracle 19c Grid Infrastructure for a Standalone server-Oracle Restart; Apply Patching 32904851 Oracle 19c Database Release Update 19.12...0; Oracle Database Critical Patch Update Advisory - July 2021; Oracle Database Security Assessment Tool-Version 2.2.2The Oracle automatic maintenance tasks were introduced in version 11g in order to automate tasks that Oracle DBAs used to do manually in the past (i.e. in earlier versions such as 9i, 10g). This includes the following predefined automated maintenance tasks: Automatic Optimizer Statistics Collection - Collecting optimizer statistics for objects ...department_id a no_stats b 27 .037037037 no 0 4 c10b c2034 27 department_name a no_stats b 27 .037037037 no 0 12 41636 54726 27 location_id a no_stats b 7 .018518518 yes 0 3 c20f c21c 27 manager_id a no_stats b 11 .090909090 no 16 3 c202 c2030 11 ~~~~~ index / (sub)partition statistics difference: .....Sometimes, you need to modify the statistics of a table. There are various reasons: either for the performance analysis or because the execution plan changed. Oracle offers two methods: statistics restore or statistics export. Both are in the dbms_stats package.Create single-column statistics with default options. To create statistics on a column, provide a name for the statistics object and the name of the column. This syntax uses all of the default options. By default, 20 percent of the table is sampled when creating statistics. SQL.Oracle Optimizer Statistics Advisor in Oracle Database 12.2.0.1. The Oracle Optimizer Statistics Advisor in Oracle Database 12.2.0.1 is something I planned to write about for quite a while. Roy and I include this topic in the New Features section in our Upgrade / Migrate / Consolidate to Oracle Database 12.2 slide deck for some time.(AUTOFIXUP) Gather stale data dictionary statistics prior to database upgrade in off-peak time using: EXECUTE DBMS_STATS.GATHER_DICTIONARY_STATS; Dictionary statistics do not exist or are stale (not up-to-date). Dictionary statistics help the Oracle optimizer find efficient SQL execution plans and are essential for proper upgrade timing.For more information, see Statistics and Cardinality Estimation (SQL Server). DBCC SHOW_STATISTICS displays the header, histogram, and density vector based on data stored in the statistics object. The syntax lets you specify a table or indexed view along with a target index name, statistics name, or column name.ANALYZE INDEX. The next way the ANALYZE command is used is to analyze an index. There are actually two versions of this command, ANALYZE INDEX and ANALYZE TABLE FOR ALL INDEXES. When you use this command, Oracle calculates information about the B-tree depth and the distribution of leaf and branch blocks.Feb 21, 2015 · ORACLE SQL to check Stale statistics SQL to check Stale statistics---Using Anonymous PL/SQL block SQL> SET SERVEROUTPUT ON DECLARE ObjList dbms_stats.ObjectTab; Dec 27, 2020 · Dictionary statistics do not exist or are stale (not up-to-date). ... 13. Check the Oracle Backup and Recovery User's Guide for information on how. Tutorial Table Statistics: Databases for Developers: Performance #2; Description When choosing an execution plan, the optimizer uses the table statistics to decide how to access tables and in which order. This tutorial shows you how to view database statistics, spot when they are out-of-date, and how to update them. Tags performance, dbms_stats; Area Performance and TuningStarting from Oracle 10g, Oracle introduced an automated task gathers statistics on all objects in the database that having [stale or missing] statistics, To check the status of that task: SQL> select status from dba_autotask_client where client_name = 'auto optimizer stats collection';How to check Stale Stats: ... Step 6: Lastly if nothing helps Better to have a Sev-1 SR case opened with Oracle and let the oracle experts look into this performance issue. So here was the high-level steps to look into a long running Query in Oracle. Thank you for visiting us,Due to Oracle bug 19897084, you must make sure that the oratab contains the corresponding entry for the database you want to upgrade, <DBSID>:<Oracle_home>:N. This is especially necessary if you run DBUA in non-silent mode. Media Speed Running: 1000 Mbps Full Duplex. Question : How to get network statistic of ethernet adapter in AIX. Answer : "entstat -d <interface>" command can be used to display statistic of specific ethernet adapter in AIX. Alternative, "netstat -v" command can be used to display statistic of all ethernet adapter in AIX.Figure 1: Sample Results - ALL Tables in Database. If you only want to look at how stale the statistics are for a particular table, then you can just apply a filter to the name in the sys ...2 BEST PRACTICES FOR GATHERING OPTIMIZER STATISTICS WITH ORACLE DATABASE 12C RELEASE 2 To check what preferences have been set, you can use the DBMS_STATS.GET_PREFS function. It takes three arguments; the name of the parameter, the schema name, and the table name: select dbms_stats.get_prefs('STALE_PERCENT',user,'SALES') stale_percent from dual;To check for tables with stale statistics: declare mystaleobjs dbms_stats.objecttab; begin — check whether there is any stale objects dbms_stats.gather_schema_stats(ownname=>'SYSTEM', options=>'LIST STALE',objlist=> mystaleobjs); for i in 1 .. mystaleobjs.count loop dbms_output.put_line(mystaleobjs(i).objname); end loop; end; / The ...And i had nothing else to say. So once interview was finished i decided to check how i can find out if my stats are stale. Check dba_tables last analyzed column. LIST STALE==>Works similar to option 2. Returns list of stale objects by query dba_tab_modifications table). Query DBA_TAB_COL_STATISTICS to check for stale column statistics.With Oracle Database Cache, your applications can process several times as many requests as their original capacity. How do you know if a statistical table is stale? To see if Oracle thinks the statistics on your table are stale, you want to look at the STALE_STATS column in DBA_STATISTICS. If the column returns "YES" Oracle believes that ...If Oracle is using stale statistics to select the most efficient way of retrieving data from the database, performance is a likely casualty. For example, a typically costly operation like a full table scan does not impair performance gravely on a small table.Description. This script list the top 10 columns most used in equality predicates or equijoin predicates and which are not indexed. If you want to be more precise in your analyze you can limit the list to table containing more than a defined number of rows by adding the dba_tables table and filter on the num_rows column.If it finds any stale statistics it will give the recommended commands to remove those stale statistics. Run the script as sys user take the spool for the same. Script kept at : /oracle/check_stale_stats.sqlIn previous Database releases you had to use the DBMS_STATS.SET_PARM procedure to change the default value for the parameters used by the DBMS_STATS.GATHER_*_STATS procedures. The scope of any changes that were made was all subsequent operations. In Oracle Database 11g, the DBMS_STATS.SET_PARM procedure has been deprecated and it has been replaced with a set of…I recently had an interesting support case that shows how the cause of a problem can sometimes be where you would least suspect it. About table bloat After an UPDATE or DELETE, PostgreSQL keeps old versions of a table row around.An interesting technique to speed things up is to gather only "stale" stats. There is an excellent article here for 9i and before. In Oracle 10g, by default stale statistics for the database are gathered once a day.To see if Oracle thinks the statistics on your table are stale, you want to look at the STALE_STATS column in DBA_STATISTICS. If the column returns "YES" Oracle believes that it's time to re-gather stats. However, if the column returns "NO" then Oracle thinks that the statistics are up-to-date. How do you resolve stale stats in Oracle?Should use the DBMS_STATS.GATHER_SCHEMA_STATS procedure to gather statistics for your 9.2.0.X database. To verify the schema with stale statistics, refer Note 560336.1 Script to Check Schemas with Stale Statistics How to check Export/Import data pump job status Monitor export/Import with the data pump views - The main view to monitor Export/Import jobs are dba_datapump_jobs and dba_datapump_sessions. set line 190 col OWNER_NAME for a30 col JOB_NAME for a30 col OPERATION for a20 col JOB_MODE for a20 select OWNER_NAME,JOB_NAME,OPERATION,JOB_MODE,STATE ...Real-Time Statistics Oracle Database automatically gathers online statistics during conventional DML operations. Statistics can go stale between execution of DBMS_STATS statistics gathering jobs. By gathering some statistics automatically during DML operations, the database augments the statistics gathered by DBMS_STATS.check_oracle_health is a plugin for the Nagios monitoring software that allows you to monitor various metrics of an Oracle database. It includes connection time, SGA data buffer hit ratio, SGA library cache hit ratio, SGA dictionary cache hit ratio, SGA shared pool free, PGA in memory sort ratio, tablespace usage, tablespace fragmentation, tablespace I/O balance, invalid objects, and many more.Note that if autovacuum is not gathering stats reliably, you should consider changing autovacuum settings to be more aggressive (by default, autovacuum will limit its activity to avoid interfering with your query workload, but if it's de-prioritizing itself too much you may have chronically stale statistics and runaway dead tuple bloat, which can affect performance).Linux Shell Script to gather statistics of a whole schema or a table and its indexes in nohup mode - gather_stats.shAug 18, 2009 · Gather_stats_job was introduced with Oracle 10g to gather statistics for database objects which has stale statistics (10% of data has changed, you can query dba_tab_modifications) or the tables for which the statistics has not been gathered (new tables created/truncated). Check any critical table statistics became stale select count(*),owner from dba_tab_statistics where stale_stats='YES'; Make sure that no highly accessed tables are in stale stats and gather the stats if any.If you delete the global stats and gather stats on all partitions, you see the values appear at table level too. Oracle is a bit funny about partitions without statistics. It will manage the stats but not create them. It does not harm to tell the optimizer that a partition is empty. This works from v11 and up. (Did not check v19) -Mar 07, 2015 · Starting from Oracle 10g, Oracle introduced an automated task gathers statistics on all objects in the database that having [stale or missing] statistics, To check the status of that task: SQL> select status from dba_autotask_client where client_name = 'auto optimizer stats collection'; One important aspect of a healthy Oracle database is database statistics. It's the main data on which CBO feeds to generate good execution plans for SQLs. Implementing a periodic and consistent gather statistics procedure in Oracle E-Business Suite is every Applications DBA's duty.ORACLE SQL to check Stale statistics SQL to check Stale statistics---Using Anonymous PL/SQL block SQL> SET SERVEROUTPUT ON DECLARE ObjList dbms_stats.ObjectTab; BEGIN dbms_stats.gather_database_stats(objlist=>ObjList, options=>'LIST STALE'); FOR i in ObjList.FIRST..ObjList.LASTStale Statistics. Now to make the statistics stale, I have modified the data in the table and have not refreshed statistics. Note that there are no rows for MM = 1 or 2, so that actual NDV = 10. Although there are 8388 rows in table, dictionary statistics still shows NUM_ROWS = 10000 and NDV = 12Here we are going to demonstrate how to find the last analyzed date on tables in Oracle. Some time due to performance issues, statistics locked on the table, disable statistics in the database, before/after manual analyze on tables or gather statistics, before/after migration, etc. We need to know the last analyzed of tables, partitions, and ...Oracle Database 12c: Enterprise Manager Database Express. Posted on June 27, 2013. Oracle Database 12c says goodbye to a tool being around after the 10gR1: the Database Console. OC4J for the 10g and weblogic for the 11g, both have had a non-negligible overhead on the systems, especially with many configured instances. Oracle SQL optimization relies on accurate database statistics. The dbms_stats utility makes the gathering of useful data easier. Examine the options available with this utility and form your best ...Oracle does track how many inserts, updates, and deletes are performed on a table in the DBA_TAB_MODIFICATIONS view. It is not kept real-time so if you need to examine it over a small time period then you have to flush the stats so you can see (easy).After running this procedure, check whether statistics are stale by querying the STALE_STATS column in DBA_TAB_STATISTICS and DBA_IND_STATISTICS. This column is based on data in the DBA_TAB_MODIFICATIONS view and the STALE_PERCENT preference for DBMS_STATS. The STALE_STATS column has the following possible values: YESTo check tables and indexes last analyzed date and Database stats. set pages 200. col index_owner form a10. col table_owner form a10. col owner form a10. spool checkstat.lst. PROMPT Regular Tables. select owner,table_name,last_analyzed, global_stats. from dba_tables.New objects will pick up the GLOBAL_PREF values for all parameters. It is also possible to include the Oracle owned schemas (sys, system, etc) by setting the ADD_SYS parameter to TRUE. exec DBMS_STATS.SET_DATABASE_PREFS('STALE_PERCENT','2'); We can change the default values of the parameters by using DBMS_STATS.SET_GLOBAL_PREFS.What Are Database Statistics Oracle? Optimizer statistics describe the objects in a database and the database itself. Optimizers use these statistics to determine the best execution plan for each SQL statement based on their analysis. Data dictionary views, such as those available for accessing statistics, are stored in the data dictionary.Sep 04, 2008 · The Data Pump export utility provides a mechanism for transferring data objects. between Oracle databases. The utility is invoked with the following command: Example: expdp scott/tiger DIRECTORY=dmpdir DUMPFILE=scott.dmp. You can control how Export runs by entering the ‘expdp’ command followed. by various parameters. One important aspect of a healthy Oracle database is database statistics. It's the main data on which CBO feeds to generate good execution plans for SQLs. Implementing a periodic and consistent gather statistics procedure in Oracle E-Business Suite is every Applications DBA's duty.New objects will pick up the GLOBAL_PREF values for all parameters. It is also possible to include the Oracle owned schemas (sys, system, etc) by setting the ADD_SYS parameter to TRUE. exec DBMS_STATS.SET_DATABASE_PREFS('STALE_PERCENT','2'); We can change the default values of the parameters by using DBMS_STATS.SET_GLOBAL_PREFS.10. SQL Health Check 11. SQL Plan Flip 12. Find Stale Stats 13. Gather Stats 14. PIN Optimal Plan 15. Find Fragmentation 16. De-Fragmentation _____ 1. Flow Chart *** Please click on each box in flow chart below to take you to respective script section. 2. Logon to Database Before checking all , Generally we check on the stats of tables and indexes whether they are stale or not but this becomes a tedious job , to check all the tables and indexes involved in the query. From OEM we can run tuning advisor and get the details of the stats of tables and indexes (or) we can use a script to get the details.Stale statistics---> Owner: SYS--Object name: MON_MODS$--Object type: TABLE. Posted by horia.berca at 12:53 PM 1 comment: Email This BlogThis! Share to Twitter Share to Facebook Share to Pinterest. Tuesday, July 2, 2013. Oracle Database check what features are used. To check which features are used you shall check: select name,version,detected ...Stats can become stale when the data in the table changes substantially.Up to date statistics are important to generate good execution plans. How Oracle decide if the stats has become stale. Stats are considered stale when #(INSERTS + UPDATES + DELETES) >= 10% of NUM_ROWS from dba_tables: Parameter setting required to Track the table changesApplies to: Oracle Server - Enterprise Edition - Version: 9.2.0.1 to 10.2.0.2 This problem can occur on any platform. Symptoms When running the pre-upgrade script utlu102i.sql , the following warning occurs : WARNING: --> Database contains stale optimizer statistics. .... Refer to the 10g Upgrade Guide for instructions to update .... statistics prior to upgrading…statistics are stale or missing, the optimizer does not have the necessary information it needs and can generate poor execution plans. The Automatic Tuning Optimizer checks each query object for missing or stale statistics, and produces two types of output: Recommendations to gather relevant statistics for objects with stale or no statistics. How to find the tables that have stale statistics? Using the code below one can find the tables/indexes that have stale statistics in a database, when options=>'GATHER AUTO' is used oracle gathers statistics analyzes the tables/indexes that have stale statistics.Blog on Oracle Middleware Technologies - Oracle AIA, Oracle BAM, Oracle FMW, BPEL, XSLT, XML and more. Tuesday, October 11, 2011 View stale Instances in SOA 10g/11g - UpdateStatistics | Good Stats During Upgrade Upgrade duration for Oracle E-Business Suite DURATION REDUCTION No dictionary and fixed objects stats 10 hrs 56 min 52 sec Gathered dictionary and fixed objects stats 52 min 42 sec 93 % Gathered schema and cluster index stats 52 min 25 sec 0.5 % to previous Total downtime saved 10 hrs 4 min 14 sec 93.5 % ...Linux Shell Script to gather statistics of a whole schema or a table and its indexes in nohup mode - gather_stats.shThere is a Metalink Note 560336.1 that includes an sql script to check schemas to find only those with stale statistics. This script then outputs the needed sql statements to clean up only the schemas that have stale statisics. In our case there was only 1 schema that had stale statistics.Oracle: Oracle has last_analyzed column in user_tables and user_indexes table which is accessible to schema owner. One can check for both tables and indexes when statistics was last collected. SQL> SELECT table_name, last_analyzed 2 FROM user_tables 3 WHERE temporary = 'N' 4 / TABLE_NAME LAST_ANAL ----- ----- NEW_TEST 07-MAR-07 PADTEST 08-MAR-07 TEST_COMPUTE 02-APR-07 INPT_CITY 09-APR-07…Oracle automatically gathers statistics for stale objects, unless the task has been manually disabled. This is usually good enough for OLTP systems. Use this query to find the status of the task: select status from dba_autotask_client where client_name = 'auto optimizer stats collection'; STATUS ------ ENABLEDFeb 08, 2022 · The Oracle database collects statistics for database objects that are missing statistics or have “stale” (out of date) statistics. This is done by an automatic task that executes during a predefined maintenance window. What is a stale index? Statistics are likely to be stale if the number of distinct values in an index has changed ... Those statistics are specific to the Oracle Database release that generates them, and can be stale upon database upgrade. For information on managing optimizer statistics, refer to the 11.2.0.4 Oracle Database Performance Tuning Guide. Upgrade the database timezone file. Connect to sqlplus and start the database in upgrade modeWhat are statistics? Ans: Input to the Cost-Based Optimizer, Provide information on User Objects Table, Partition, Subpartition Columns Index, Index Partition, Index Subpartition System Dictionary Memory structure (X$) Statistics on a table are considered stale when more than STALE_PERCENT (default 10%) of the rows are changed (total number of inserts, deletes, updates) in the table.·Gather optimizer statistics for objects with no or stale statistics ·Rewrite queries based on the advisor's advice Using the SQL Tuning Advisor Using the DBMS_SQLTUNE Package The DBMS_SQLTUNE package is the main Oracle Database 10g interface to tune SQL statements. Following are the required steps: 1.Create a task.2 BEST PRACTICES FOR GATHERING OPTIMIZER STATISTICS WITH ORACLE DATABASE 12C RELEASE 2 To check what preferences have been set, you can use the DBMS_STATS.GET_PREFS function. It takes three arguments; the name of the parameter, the schema name, and the table name: select dbms_stats.get_prefs('STALE_PERCENT',user,'SALES') stale_percent from dual;Check your database statistics on the instance that is having issues. If the statistics are stale, then the optimizer will often come up with a different execution plan, including not using indexes where it normally would if it had current stats. One way to quickly check is to compare the explain plan output for the same query on both databases.With Oracle Database Cache, your applications can process several times as many requests as their original capacity. How do you know if a statistical table is stale? To see if Oracle thinks the statistics on your table are stale, you want to look at the STALE_STATS column in DBA_STATISTICS. If the column returns "YES" Oracle believes that ...What Are Table Statistics In Oracle? These data are used by Oracle to identify tables that have not changed. DBMS_STATS can then be invoked to generate automated statistics by setting up recurring jobs (such as using job queues). You can use the GATHER STALE option at the appropriate interval for your application to display GATHER_TABLE_STATS.Applies to: Oracle Server - Enterprise Edition - Version: 9.2.0.1 to 10.2.0.2 This problem can occur on any platform. Symptoms When running the pre-upgrade script utlu102i.sql , the following warning occurs : WARNING: --> Database contains stale optimizer statistics. .... Refer to the 10g Upgrade Guide for instructions to update .... statistics prior to upgrading…In previous Database releases you had to use the DBMS_STATS.SET_PARM procedure to change the default value for the parameters used by the DBMS_STATS.GATHER_*_STATS procedures. The scope of any changes that were made was all subsequent operations. In Oracle Database 11g, the DBMS_STATS.SET_PARM procedure has been deprecated and it has been replaced with a set of…Oracle Database 19c introduces real-time statistics, which extend online support to conventional DML statements. Because statistics can go stale between DBMS_STATS jobs, real-time statistics helps the optimizer generate more optimal plans. Checking for real-time statistics gathering. 1. Generate explain plan/execution plan for the operation.Remember that if you are using incremental statistics in Oracle Database 11g, a single DML operation on a partition or sub-partition will make it a target for a statistics refresh - even if it is not marked stale. In other words, we might update one row in a partition containing 1 million rows. There is no need to gather stats for all the partition because oracle internally distribute the data based on the partitioned key. STEPS TO MAINTAIN STATISTICS ON LARGE PARTITION TABLES. STEP 1: Gather stats for any one partition say P185.How to find the tables that have stale statistics? Using the code below one can find the tables/indexes that have stale statistics in a database, when options=>'GATHER AUTO' is used oracle gathers statistics analyzes the tables/indexes that have stale statistics.upgrade in off-peak time using: EXECUTE DBMS_STATS.GATHER_DICTIONARY_STATS; Dictionary statistics do not exist or are stale (not up-to-date). Dictionary statistics help the Oracle optimizer find efficient SQL execution plans and are essential for proper upgrade timing. Oracle recommends gathering dictionary statistics in the last 24 hours ...Since Oracle 12c, table statistics are gathered automatically for some bulk operations. This inconspicuous new feature called "Online Statistics Gathering for Bulk Loads" is very practical for ETL jobs in Data Warehouses.I remember an interesting discussion during Oracle OpenWorld 2009 in the Thirsty Bear Pub in San Francisco. Thanks to my Trivadis colleague Chris Antognini, we…RUNNING GATHERSTATS Description: In this blog, we are going to see what has gathered stats and various levels of gather stats. What is GATHERSTATS: To gather stats in oracle we require to use the DBMS_STATS package. It will collect the statistics in parallel with collecting the global statistics for partitioned objects.Stale statistics---> Owner: SYS--Object name: MON_MODS$--Object type: TABLE. Posted by horia.berca at 12:53 PM 1 comment: Email This BlogThis! Share to Twitter Share to Facebook Share to Pinterest. Tuesday, July 2, 2013. Oracle Database check what features are used. To check which features are used you shall check: select name,version,detected ...Incremental statistics reduce the time to gather global statistics for a partitioned table. Really? In some situations it may happen that incremental statistics slow down statistics calculation dramatically. An example of a real project in Oracle 12.1 and how it can be improved with Oracle 12.2.Gathering global statistics of a partitioned table is time-consuming.Those statistics are specific to the Oracle Database release that generates them, and can be stale upon database upgrade. For information on managing optimizer statistics, refer to the 11.2.0.4 Oracle Database Performance Tuning Guide. Upgrade the database timezone file. Connect to sqlplus and start the database in upgrade modeI have a requirement where i need to check before our nightly batch begins to check all the stale table and run a loop to run gather stats on all of those stale tables. Could you please help me with the same.According to Oracle a table is called STALE from time t1 till time t2 if the total number of inserts, deletes and updates for the table exceeds 10% of the number of rows in the table at momemnt t1. So if a table has 100 rows, it will become STALE after the 11th DML operation. Oracle Certified Master.Remember that if you are using incremental statistics in Oracle Database 11g, a single DML operation on a partition or sub-partition will make it a target for a statistics refresh - even if it is not marked stale. In other words, we might update one row in a partition containing 1 million rows.As for the refreshing, if there's going to be a lot of changes to the MV (due to changes in the base tables), the indexes you've created would get inefficient, due to stale statistics which can influence the Oracle optimizer on whether the index gets used.Recently in one of the webcast, while I was presenting about statistics and performance tuning, I was asked by one of the attendees that if there is anyway to find out all the outdated statistics based on the dates from the server. This is indeed a very interesting question and I will be happy to explain you here.You can use this package to gather, modify, view, export, import, and delete statistics. You can also use this package to identify or name statistics gathered. The DBMS_STATS package can gather statistics on indexes, tables, columns, and partitions, as well as statistics on all schema objects in a schema or database.Check any critical table statistics became stale select count(*),owner from dba_tab_statistics where stale_stats='YES'; Make sure that no highly accessed tables are in stale stats and gather the stats if any.Related Articles Gathering Statistics in Release 11i and R12 Incremental Statistics Gathering in 11g ora-20001 in Gather schema stats on 11g(FND_HISTOGRAM_COLS) How to set Table Monitoring in Oracle and Relationship with STATISTICS_LEVEL Oracle Tutorial: How to check Stale statistics Oracle Optimizer Mode Oracle documentation on statisticsORACLE SQL to check Stale statistics SQL to check Stale statistics---Using Anonymous PL/SQL block SQL> SET SERVEROUTPUT ON DECLARE ObjList dbms_stats.ObjectTab; BEGIN dbms_stats.gather_database_stats(objlist=>ObjList, options=>'LIST STALE'); FOR i in ObjList.FIRST..ObjList.LASTDec 30, 2013 · In 07/11/2012 my theme of: “Orneklerle Oracle 11g R2 ve Genel Kavramlar / Oracle 11g R2 General Concepts with Examples ” was published as a book. The book was published: 07.11.2012, edition 356 copies, order was 50. “This books was freely distributed to the Oracle beginners in Turkey and Azerbaijan” UPDATE STATISTICS in SQL Server. Statistics store information about the data distribution of the column value (s) in your tables as well as the total number of rows. For indexes it stores the distribution of key values. A histogram is created for the first table column in each statistics object which stores this data distribution or cardinality.Starting from Oracle 10g, Oracle introduced an automated task gathers statistics on all objects in the database that having [stale or missing] statistics, To check the status of that task: SQL> select status from dba_autotask_client where client_name = 'auto optimizer stats collection'; Data Entry page in OAF. First create one workspace and project. Create the AM. Create the page and attach the AM to the main region of the page. For Data Entry or any DML operation we need to create the Entity Object. Steps to create the EO. Right click on the project select new and then ADF Business Component And Entity Object. In Oracle 11g we have option to put newly collect stats in pending state and published latter once satisfied by performance testing based on new statistics. In 10g we have face performance issue when collected stats on OLTP (24 X 7 ) database, probably because stats of one index/ table published before other.Patching Oracle Enterprise Manager 13c Release 4 Update 12 For OMS And Weblogic; Patching Oracle 19c Grid Infrastructure for a Standalone server-Oracle Restart; Apply Patching 32904851 Oracle 19c Database Release Update 19.12...0; Oracle Database Critical Patch Update Advisory - July 2021; Oracle Database Security Assessment Tool-Version 2.2.2There is a Metalink Note 560336.1 that includes an sql script to check schemas to find only those with stale statistics. This script then outputs the needed sql statements to clean up only the schemas that have stale statisics. In our case there was only 1 schema that had stale statistics.Solution: To resolve the issue first we need to lay down 12.2 software using rapidwiz, then create the upgrade file system by running rapid install. Once above steps are done , now run checkMTpatch.sh script after sourcing 12.2 environment it will complete successfully. $ cd /fs1/EBSapps/appl.— Use below script How to Check Stale Stats of Schema in Oracle Database SET SERVEROUTPUT ON DECLARE ObjList dbms_stats.ObjectTab; […]This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.The platform concentrates on all Database Technologies like Oracle Database Administration(DBA), Oracle RAC, Oracle GoldenGate, MySQL, SQL Server Database Administration, Cassandra, AWS and DevOps. This page consists of all the well-developed articles of the Technologies.Introduction. dbms_stats.gather_schema_stats is equiped with the option gather auto.The Oracle documentation says that "Oracle implicitly determines which objects need new statistics" without exactly exposing the criteria for selecting objects. However, gather auto seems to be the concatenation of gather stale and gather empty, which can be verified by running the test case below.To check for tables with stale statistics: declare mystaleobjs dbms_stats.objecttab; begin — check whether there is any stale objects dbms_stats.gather_schema_stats(ownname=>'SYSTEM', options=>'LIST STALE',objlist=> mystaleobjs); for i in 1 .. mystaleobjs.count loop dbms_output.put_line(mystaleobjs(i).objname); end loop; end; / The ...In previous Database releases you had to use the DBMS_STATS.SET_PARM procedure to change the default value for the parameters used by the DBMS_STATS.GATHER_*_STATS procedures. The scope of any changes that were made was all subsequent operations. In Oracle Database 11g, the DBMS_STATS.SET_PARM procedure has been deprecated and it has been replaced with a set of…ORACLE SQL to check Stale statistics SQL to check Stale statistics---Using Anonymous PL/SQL block SQL> SET SERVEROUTPUT ON DECLARE ObjList dbms_stats.ObjectTab; BEGIN dbms_stats.gather_database_stats(objlist=>ObjList, options=>'LIST STALE'); FOR i in ObjList.FIRST..ObjList.LASTStep 2: Change the permission for the shell script. $ chmod 744 sql.sh. Step 3: Create a sql script file to generate the scripts for gather statistics command. Make necessary changes to the table names mentioned in red color below. $ cat cr_gather.sql. set pages 100.RUNNING GATHERSTATS Description: In this blog, we are going to see what has gathered stats and various levels of gather stats. What is GATHERSTATS: To gather stats in oracle we require to use the DBMS_STATS package. It will collect the statistics in parallel with collecting the global statistics for partitioned objects.Create single-column statistics with default options. To create statistics on a column, provide a name for the statistics object and the name of the column. This syntax uses all of the default options. By default, 20 percent of the table is sampled when creating statistics. SQL.The platform concentrates on all Database Technologies like Oracle Database Administration(DBA), Oracle RAC, Oracle GoldenGate, MySQL, SQL Server Database Administration, Cassandra, AWS and DevOps. This page consists of all the well-developed articles of the Technologies. This is an effort of many dedicated professionals for a better IT world.How to check if you have empty or stale statistics? I have created and one can use this simple script. set serveroutput on. declare. obj_empty dbms_stats.objecttab; obj_stale dbms_stats.objecttab; begin. dbms_stats.gather_database_stats (OPTIONS=>'LIST EMPTY',OBJLIST=>obj_empty); for i in 1 .. obj_empty.count.Apr 27, 2021 · Find the Index Stale Statistics. select owner,INDEX_NAME,TABLE_NAME,STALE_STATS from DBA_IND_STATISTICS where owner='&SCHEMA_NAME' and index_name='&INDEX_NAME'; OR select LAST_ANALYZED,index_name,STALE_STATS from dba_ind_statistics where owner='SCOTT' and stale_stats ='YES'; If it finds any stale statistics it will give the recommended commands to remove those stale statistics. Run the script as sys user take the spool for the same. Script kept at : /oracle/check_stale_stats.sqlOracle implicitly determines which objects need new statistics, and determines how to gather those statistics. When GATHER AUTO is specified, the only additional valid parameters are ownname, stattab, statid, objlist and statown; all other parameter settings are ignored. Returns a list of processed objects.The "dark art" of SQL Server has just gone wrong, as we have stale statistics! Opening the "Statistics" section of the table within the Object Explorer shows tons of them. A thought goes through your head, "Why does SQL Server create so many statistics automatically". Well, that's the least of our problems at this point in time.— Use below script How to Check Stale Stats of Schema in Oracle Database SET SERVEROUTPUT ON DECLARE ObjList dbms_stats.ObjectTab; […]Mar 07, 2015 · Starting from Oracle 10g, Oracle introduced an automated task gathers statistics on all objects in the database that having [stale or missing] statistics, To check the status of that task: SQL> select status from dba_autotask_client where client_name = 'auto optimizer stats collection'; 3.How To Check Tables With Stale/Empty Stats? Ever wondered how you can check what tables are candidates for new statistics? By default Oracle considers the statistics to be stale if the table data has changed by 10% or more. The stale percent can be changed, at the database level, schema level or table level, with dbms_stats.Stale stats on tables. You should always keep this clean. Killer Indexes that will actually blow up your system and confuse Oracle query optimizer. You need to get rid of those indexes and rewrite queries that you thought will hit those indexes for better performance. They won't.Apr 14, 2021 · How to List the Objects with Stale Statistics Using dbms_stats.gather_schema_stats options=>'LIST STALE' (Doc ID 457666.1) Last updated on APRIL 14, 2021 Applies to: Oracle Database - Enterprise Edition - Version 10.1.0.2 and later Oracle Database Cloud Schema Service - Version N/A and later Feb 01, 2018 · First check how many inactive session are present , check fragmentation details , blocking sessions. stale statistics , index usable or unsable. check listeners logs if there is any client time out issues. Optimization in SQL: Determining Stale Statistics in Oracle. You can determine whether statistics are stale in Oracle using two methods. The first is to make Oracle tell you if it considers the stats are stale. The second involves a comparison of the statistics of what the DBMS assumes a table to be - and what it really is.How to check Compatibility Initialization Parameter: ... SQL> SELECT DBMS_STATS.GET_PREFS('STALE_PERCENT', 'HR', 'JOBS') STALE_PERCENT 2 FROM DUAL; ... Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options ...This entry was posted in Statistics and tagged dbms_stats, export, import, statistics. Bookmark the permalink. 0 people found this article useful This article was helpful. This article was helpful. 0 people found this article useful. Post navigation; How to lock / unlock statistics; Check stale stats for table and indexAug 18, 2009 · Gather_stats_job was introduced with Oracle 10g to gather statistics for database objects which has stale statistics (10% of data has changed, you can query dba_tab_modifications) or the tables for which the statistics has not been gathered (new tables created/truncated). Oracle EBS Database clone using RMAN; How to stop and start redo transport in oracle Dat... Query for sanity check in Primary and Standby Orac... Sending mail in Linux using mutt; How to check Oracle ASM Diskspace; Oracle Notes for platform migration from EBS 11i t... Oracle Data Pump Performance Tuning; How to move SQL Profile from one ...Sep 22, 2014 · Actually I'm not in favor of the approach of gathering statistics on the whole database, unless you are doing so for the purpose of gather statistics on the tables having stale statistics, starting with Oracle 10g Oracle introducing an auto-tune job to gather statistics on tables that have missing or stale statistics: You can check the status ... With Oracle Database Cache, your applications can process several times as many requests as their original capacity. How do you know if a statistical table is stale? To see if Oracle thinks the statistics on your table are stale, you want to look at the STALE_STATS column in DBA_STATISTICS. If the column returns "YES" Oracle believes that ...Home / DATABASE / Useful gather statistics commands in oracle. Useful gather statistics commands in oracle. 10972 views 4 min , 59 sec read 0 This article contains all the useful gather statistics related commands. 1. Gather dictionary stats: ... --Check stale stats for index: select owner,INDEX_NAME,TABLE_NAME from DBA_IND_STATISTICS where ...Check_oracle_health plugin needs sqlplus oracle client on the Shinken server, you can download packages on the Oracle Technology Network website. ... stale-statistics ... And this was the situation on HP-UX Oracle 10.2.0.4 64bit: Oracle did a TRUNCATE of the MV; Oracle set the indexes to unusable AND set the statistics of the GLOBAL indexes to zero! Oracle did the Direct Path Insert; Oracle rebuilt the indexes -> automatic analyze of the LOCAL partitioned indexes, but not of the GLOBAL onesRelated Articles Gathering Statistics in Release 11i and R12 Incremental Statistics Gathering in 11g ora-20001 in Gather schema stats on 11g(FND_HISTOGRAM_COLS) How to set Table Monitoring in Oracle and Relationship with STATISTICS_LEVEL Oracle Tutorial: How to check Stale statistics Oracle Optimizer Mode Oracle documentation on statisticsFeb 21, 2015 · ORACLE SQL to check Stale statistics SQL to check Stale statistics---Using Anonymous PL/SQL block SQL> SET SERVEROUTPUT ON DECLARE ObjList dbms_stats.ObjectTab; ORACLE : GET RECORD COUNTS OF ALL TABLES IN A SCHEMA. ORACLE : GET RECORD COUNTS OF ALL TABLES IN A SCHEMA. Admin September 19, 2019 PL/SQL TUTORIAL, SQL TUTORIAL. METHOD-1: The below query will give a number of rows for the required tables but these are not accurate until we ANALYZE(gather stats) the tables. So we can not depend on the ALL ...Applies to: Oracle Server - Enterprise Edition - Version: 9.2.0.1 to 10.2.0.2 This problem can occur on any platform. Symptoms When running the pre-upgrade script utlu102i.sql , the following warning occurs : WARNING: --> Database contains stale optimizer statistics. .... Refer to the 10g Upgrade Guide for instructions to update .... statistics prior to upgrading…Oracle recommends that all tables without the statistics collection is data is default value is important than collecting statistics will oracle: in incremental stats are not. These can also be known as frequency histograms. We need to use FORCE option to gather the statistics while creating index for locked objects.This script was written and tested on Oracle Enterprise RDBMS 11.2.0.3. The reason this script was written was because the database could not keep up to date statistics while relying on the maintenance windows.Indeed, the spinand_mtd_read() call was incrementing the ecc_stats counters depending on the outcome of spinand_check_ecc_status() directly. So now let's split the logic like this: - spinand_check_ecc_status() is specific to the SPI-NAND on-die engine and is kept very simple: it just returns the ECC status (bonus point: the content of this ... Trace flag 2371 was first introduced in SQL 2008 R2 SP1 and has been turned on by default in SQL 2016 (with compatibility 130). Using trace flag 2371, SQL will now use a threshold that adjusts dynamically to the number of rows in the table to determine when statistics are stale. With this change, statistics in large tables are updated much more ...After running this procedure, check whether statistics are stale by querying the STALE_STATS column in DBA_TAB_STATISTICS and DBA_IND_STATISTICS. This column is based on data in the DBA_TAB_MODIFICATIONS view and the STALE_PERCENT preference for DBMS_STATS. The STALE_STATS column has the following possible values: YESSince Oracle 12c, table statistics are gathered automatically for some bulk operations. This inconspicuous new feature called "Online Statistics Gathering for Bulk Loads" is very practical for ETL jobs in Data Warehouses.I remember an interesting discussion during Oracle OpenWorld 2009 in the Thirsty Bear Pub in San Francisco. Thanks to my Trivadis colleague Chris Antognini, we…Apr 27, 2021 · Find the Index Stale Statistics. select owner,INDEX_NAME,TABLE_NAME,STALE_STATS from DBA_IND_STATISTICS where owner='&SCHEMA_NAME' and index_name='&INDEX_NAME'; OR select LAST_ANALYZED,index_name,STALE_STATS from dba_ind_statistics where owner='SCOTT' and stale_stats ='YES'; Tutorial Table Statistics: Databases for Developers: Performance #2; Description When choosing an execution plan, the optimizer uses the table statistics to decide how to access tables and in which order. This tutorial shows you how to view database statistics, spot when they are out-of-date, and how to update them. Tags performance, dbms_stats; Area Performance and TuningTUNING: scripts to aid with tuning dbms-sqltune-sqlid.sql - call with SQL_ID, create and execute a tuning task, run the report profile_from_awr.sql - create a SQL Profile from plan in AWR APEX: Anything to do with Apex apex-version.sql - Get the version of Apex. For CDB/PDB, run from both. LIB ADMIN: distribution.sh - the script that builds the linux tar and windows zips filesReal-Time Materialized Views in #Oracle 12c. In 12cR2, a Materialized View that is STALE can still speed up queries while delivering correct results. The data from the stale MV is then on the fly combined with the change information from MV logs in an operation called ON QUERY COMPUTATION.Oracle recommends that all tables without the statistics collection is data is default value is important than collecting statistics will oracle: in incremental stats are not. These can also be known as frequency histograms. We need to use FORCE option to gather the statistics while creating index for locked objects.The Optimizer Statistics Advisor is a new Advisor in Oracle 12.2. The goal of this Advisor is to check the way you gather the statistics on your database, and depending on what is found, it will makes some recommendations on how you can improve the statistics gathering strategy in order to provide more efficient statistics to the CBO.Check any critical table statistics became stale select count(*),owner from dba_tab_statistics where stale_stats='YES'; Make sure that no highly accessed tables are in stale stats and gather the stats if any.In this case, SQL Server updates the Statistics object if you have done 20.500 (20% + 500) data changes in the underlying column. If you have a table with 1.000.000 rows, you need 1.000.500 (20% + 500) data changes. So the algorithm here is exponential and not linear. There is also the trace flag 2371 in SQL Server that influences this behavior.(Oracle) Instructs Extract to issue a report about the statistics that are related to the processing of data from the Oracle redo log files. Extract uses an asynchronous logreader that reads ahead of the current record that Extract is processing, so that the data is available without additional I/O on the log files.• 12c introduced online statistics gathering for CREATE TABLE AS SELECT statements and direct-path inserts. • 19c introduces real-time statistics, which extend online support to conventional DML statements. • Because statistics can go stale between DBMS_STATS jobs, real-time statistics helps the optimizer generate more optimal plans.I recently had an interesting support case that shows how the cause of a problem can sometimes be where you would least suspect it. About table bloat After an UPDATE or DELETE, PostgreSQL keeps old versions of a table row around.Oracle Database Monitoring Tools. Oracle Corporation is a global computer technology corporation that primarily specializes in developing and marketing database software and technology, cloud engineered systems and enterprise software products, particularly its own brands of database management systems. While Oracle will not automatically update statistics, the percentage of stale rows is tracked on an index by index basis. When the percentage of stale rows goes beyond the STALE_PERCENT value, the statistics are considered to be stale and need to be collected again. Although the statistics update will not happen automatically, it is possible ...Jul 28, 2020 · If Oracle is using stale statistics to select the most efficient way of retrieving data from the database, performance is a likely casualty. For example, a typically costly operation like a full table scan does not impair performance gravely on a small table. DB ORG - Database Administration, Knowledge Base for DBA Mail: [email protected] WhatsApp: (+91) 9306440957 Monday to Friday: EST - 11:30 AM to 06:30 PM (IST - 9:00 PM to 4:00 AM)Statistics | Good Stats During Upgrade Upgrade duration for Oracle E-Business Suite DURATION REDUCTION No dictionary and fixed objects stats 10 hrs 56 min 52 sec Gathered dictionary and fixed objects stats 52 min 42 sec 93 % Gathered schema and cluster index stats 52 min 25 sec 0.5 % to previous Total downtime saved 10 hrs 4 min 14 sec 93.5 % ...3. Take a look at the help screen for the check_oracle_health plugin to see if it can monitor what you are looking for. You may have to create a simple Query and use the --mode sql option below to get some of the data you are looking for. Code: Select all. Check various parameters of Oracle databases.Oracle automatically gathers statistics for stale objects, unless the task has been manually disabled. This is usually good enough for OLTP systems. Use this query to find the status of the task: select status from dba_autotask_client where client_name = 'auto optimizer stats collection'; STATUS ------ ENABLEDThanks. I had a look at that page. It explains about how to gather stats of STALE tables? and various options around it. Basically, in my case, the table which I am testing on, is not getting marked as STALE. Or, possibly, I don't know, where to check if a table is marked as stale by Oracle? ThanksThe GATHER_DATABASE_STATS or GATHER_SCHEMA_STATS procedures gather new statistics for tables with stale statistics when the OPTIONS parameter is set to GATHER STALE or GATHER AUTO. If a monitored table has been modified more than STALE_PERCENT (default 10%), then these statistics are considered stale and gathered again.Oracle does track how many inserts, updates, and deletes are performed on a table in the DBA_TAB_MODIFICATIONS view. It is not kept real-time so if you need to examine it over a small time period then you have to flush the stats so you can see (easy).Since Oracle 12c, table statistics are gathered automatically for some bulk operations. This inconspicuous new feature called "Online Statistics Gathering for Bulk Loads" is very practical for ETL jobs in Data Warehouses.I remember an interesting discussion during Oracle OpenWorld 2009 in the Thirsty Bear Pub in San Francisco. Thanks to my Trivadis colleague Chris Antognini, we…Step 2: Change the permission for the shell script. $ chmod 744 sql.sh. Step 3: Create a sql script file to generate the scripts for gather statistics command. Make necessary changes to the table names mentioned in red color below. $ cat cr_gather.sql. set pages 100.Oracle implicitly determines which objects need new statistics, and determines how to gather those statistics. When GATHER AUTO is specified, the only additional valid parameters are ownname, stattab, statid, objlist and statown; all other parameter settings are ignored. Returns a list of processed objects.2 BEST PRACTICES FOR GATHERING OPTIMIZER STATISTICS WITH ORACLE DATABASE 12C RELEASE 2 To check what preferences have been set, you can use the DBMS_STATS.GET_PREFS function. It takes three arguments; the name of the parameter, the schema name, and the table name: select dbms_stats.get_prefs('STALE_PERCENT',user,'SALES') stale_percent from dual;SQL to check Stale statistics Many times Oracle SQL plan get change which will cause abnormal behavior, most probable reason could be stale statistics marked by Oracle. Below is useful queries to identify the Objects and gather stats for those Objects. Oracle do have auto jobs which takes care stats gather requirement in defined Windows.The platform concentrates on all Database Technologies like Oracle Database Administration(DBA), Oracle RAC, Oracle GoldenGate, MySQL, SQL Server Database Administration, Cassandra, AWS and DevOps. This page consists of all the well-developed articles of the Technologies.Create single-column statistics with default options. To create statistics on a column, provide a name for the statistics object and the name of the column. This syntax uses all of the default options. By default, 20 percent of the table is sampled when creating statistics. SQL.