生产上有一套11g数据库alert.log报错ORA-16957: SQL Analyze time limit interrupt。

查询MOS相关文档Troubleshooting: ORA-16957: "SQL Analyze time limit interrupt" Errors (文档 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:

COLUMNparameter_valueFORMATA30SELECTparameter_name,parameter_valueFROMdba_advisor_parametersWHEREtask_name='SYS_AUTO_SQL_TUNING_TASK'ANDparameter_nameIN('TIME_LIMIT','DEFAULT_EXECUTION_TYPE','LOCAL_TIME_LIMIT');


Then, increase the time:

Using:

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

意思是后台自动分析sql耗时超过了默认的时间限制3600s，需要使用DBMS_SQLTUNE.SET_TUNING_TASK_PARAMETER包增长时间限制。

一般在生产上不默认是不开启SQL TUNING ADVISOR。可以使用下面代码关闭自动SQL TUNING ADVISOR。

--查询当前任务状态SYS@db2>selectclient_name,statusfromDBA_AUTOTASK_CLIENT;CLIENT_NAMESTATUS------------------------------------------------------------------------autooptimizerstatscollectionENABLEDautospaceadvisorENABLEDsqltuningadvisorENABLED--禁用sqltuningadvisorSYS@db2>BEGIN2dbms_auto_task_admin.disable(3client_name=>'sqltuningadvisor',4operation=>NULL,5window_name=>NULL);6END;7/PL/SQLproceduresuccessfullycompleted.--再次查询状态SYS@db2>selectclient_name,statusfromDBA_AUTOTASK_CLIENT;CLIENT_NAMESTATUS------------------------------------------------------------------------autooptimizerstatscollectionENABLEDautospaceadvisorENABLEDsqltuningadvisorDISABLED--启用sqltuningadvisorBEGINdbms_auto_task_admin.enable(client_name=>'sqltuningadvisor',operation=>NULL,window_name=>NULL);END;

参考文档：http://blog.chinaunix.net/uid-25528717-id-3172008.html

参考文档：http://www.cnblogs.com/suredandan/p/3200157.html

参考文档：http://blog.itpub.net/235507/viewspace-1137629/

官方文档：http://docs.oracle.com/cd/E11882_01/server.112/e25494/tasks.htm#ADMIN12332