• Sys_auto_sql_tuning_task Schedule Tonight

1. SYSAUTOSQLTUNINGTASK is the default name of the Automatic SQL Tuning task. You can use this query DBAADVISORLOG to check the execution time of the same. You can also use Enterprise Manager to manage the features regarding Automatic SQL Tuning.
2. Oct 31, 2012  EXECUTE dbmssqltune.acceptsqlprofile (taskname = 'SYSAUTOSQLTUNINGTASK', objectid = 62464, REPLACE = TRUE, profiletype = DBMSSQLTUNE.PXPROFILE); Executing this query parallel WITH DOP 64 will improve its response TIME 98.27% over the original PLAN. However, there IS some COST IN enabling parallel execution.

Disable and Enable Auto task Job for 11g and 12c version in Oracle

In 10g, many diagnostic tools like ASH and AWR were embedded into the database. In 11g they were automated to collect the data into a central location. In 12c reports were automated so that DBAs did not need to schedule the jobs and generate reports late at night to look at in the morning.

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.

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
Automatic SQL Tuning Advisor – Tune high load SQL

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:

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);

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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);

SQL> EXEC DBMS_AUTO_TASK_ADMIN.ENABLE(client_name=>'auto space advisor', operation=>NULL, window_name=>NULL);

SQL> EXEC DBMS_AUTO_TASK_ADMIN.ENABLE(client_name=>'auto optimizer stats collection', operation=>NULL, window_name=>NULL);

Sys_auto_sql_tuning_task Schedule Tonight

PL/SQL procedure successfully completed.