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There is a set of 11g database alert.log error ORA-16957: SQL Analyze time limit interrupt on production.

Troubleshooting: ORA-16957: "SQL Analyze time limit interrupt" Errors (Doc ID 1275248.1)

The ORA-16957 error is an internal error code used to indicate that SQL Tuning Task has reached the time limit for tuning a specific sql.

The default time limit is 3600 seconds.

1. Check the current timing:

COLUMN parameter_value FORMAT A30 SELECT parameter_name, parameter_value FROM dba_advisor_parameters WHERE task_name = 'SYS_AUTO_SQL_TUNING_TASK' AND parameter_name IN ('TIME_LIMIT', 'DEFAULT_EXECUTION_TYPE', 'LOCAL_TIME_LIMIT');

Then, increase the time:

Using:

BEGIN DBMS_SQLTUNE.SET_TUNING_TASK_PARAMETER(task_name => 'SYS_AUTO_SQL_TUNING_TASK', parameter => 'TIME_LIMIT', value => 7200); END;/

This means that background automatic sql analysis takes more than the default time limit of 3600s, and you need to use the DBMS_SQLTUNE.SET_TUNING_TASK_PARAMETER package to increase the time limit.

Generally, SQL TUNING ADVISOR is not enabled by default in production. Automatic SQL TUNING ADVISOR can be turned off using the following code:

SYS@db2> select client_name,status from DBA_AUTOTASK_CLIENT;CLIENT_NAME STATUS---------------------------------------------------------------- --------auto optimizer stats collection ENABLEDauto space advisor ENABLEDsql tuning advisor ENABLED--disable sql tuning advisorSYS@db2> BEGIN 2 dbms_auto_task_admin.disable( 3 client_name => 'sql tuning advisor', 4 operation => NULL, 5 window_name => NULL); 6 END; 7 /PL/SQL procedure successfully completed.-- SYS@db2> select client_name,status from DBA_AUTOTASK_CLIENT;CLIENT_NAME STATUS---------------------------------------------------------------- --------auto optimizer stats collection ENABLEDauto space advisor ENABLEDsql tuning advisor DISABLED--enable sql tuning advisorBEGINdbms_auto_task_admin.enable( client_name => 'sql tuning advisor', operation => NULL, window_name => NULL);END;

Reference: blog.chinaunix.net/uid-25528717-id-3172008.html

Reference: www.cnblogs.com/suredandan/p/3200157.html

Reference: blog.itpub.net/235507/viewspace-1137629/

Official Document: docs.oracle.com/cd/E11882_01/server.112/e25494/tasks.htm#ADMIN12332

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