Disable and Enable Auto task Job for 11g and 12c version in Oracle
Automated database maintenance tasks is used by oracle to auto tune the SQL Queries, stale stats gather and space advisory. Some time this jobs change the execution plan and caused performance issue.
How to Run Oracle 12c’s SQL Tuning Advisor. Related Book. Oracle 12c For Dummies. By Chris Ruel, Michael Wessler. Oracle 12c offers a useful utility called the SQL Tuning Advisor. You can use this built-in tool to provide suggestions or recommendations about certain SQL statements. Although it may not always give perfect advice, just like. The DBMSAUTOSQLTUNE package is the interface to SQL Tuning Advisor (DBMSSQLTUNE) when run within the Autotask framework. The database creates the automated system task SYSAUTOSQLTUNINGTASK as part of the catalog scripts. This task automatically chooses a set of high-load SQL from AWR and runs the SQL Tuning Advisor on this SQL. Feb 17, 2012 DBA-Village contains news, tips, scripts and much more information for Oracle Database Administrators.
Following jobs is configured default by Oracle:
Automatic Optimizer Statistics Collection- Gathers stale or missing statistics
Automatic Segment Advisor – Identifies segments that reorganized to save space
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Automatic Optimizer Statistics Collection- Gathers stale or missing statistics
Automatic Segment Advisor – Identifies segments that reorganized to save space
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Disable all three jobs, you can used following command:
For Disable:
EXEC DBMS_AUTO_TASK_ADMIN.disable;
For Enable:
EXEC DBMS_AUTO_TASK_ADMIN.enable;
Disable one by one follow following commands: Oracle auto stats sql tuning advisor from command line.
1. Check the enabled job present in oracle database
SQL> SELECT client_name, status FROM dba_autotask_client;
2. Disable the following jobs
SQL> EXEC DBMS_AUTO_TASK_ADMIN.DISABLE(client_name=>'sql tuning advisor', operation=>NULL, window_name=>NULL);
SQL> EXEC DBMS_AUTO_TASK_ADMIN.DISABLE(client_name=>'auto space advisor', operation=>NULL, window_name=>NULL);
SQL> EXEC DBMS_AUTO_TASK_ADMIN.DISABLE(client_name=>'auto optimizer stats collection', operation=>NULL, window_name=>NULL);
PL/SQL procedure successfully completed.
3. Check the status again for auto task jobs
SQL> SELECT client_name, status FROM dba_autotask_client;
4. Enable the auto task jobs:
SQL> EXEC DBMS_AUTO_TASK_ADMIN.ENABLE(client_name=>'sql tuning advisor', operation=>NULL, window_name=>NULL);
Sys_auto_sql_tuning_task Schedule Tonight
SQL> EXEC DBMS_AUTO_TASK_ADMIN.ENABLE(client_name=>'auto space advisor', operation=>NULL, window_name=>NULL);
Sys_auto_sql_tuning_task Schedule Printable
SQL> EXEC DBMS_AUTO_TASK_ADMIN.ENABLE(client_name=>'auto optimizer stats collection', operation=>NULL, window_name=>NULL);
PL/SQL procedure successfully completed.