Oracle 11g 禁用 SQL Tuning Advisor

2017-01-10 10:02:39来源:作者:Linux公社人点击

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:

1234567 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;

/

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> select client_name,status from DBA_AUTOTASK_CLIENT;

CLIENT_NAME STATUS

---------------------------------------------------------------- --------

auto optimizer stats collection ENABLED

auto space advisor ENABLED

sql tuning advisor ENABLED

--禁用sql tuning advisor

SYS@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.

--再次查询状态

SYS@db2> select client_name,status from DBA_AUTOTASK_CLIENT;

CLIENT_NAME STATUS

---------------------------------------------------------------- --------

auto optimizer stats collection ENABLED

auto space advisor ENABLED

sql tuning advisor DISABLED

--启用sql tuning advisor

BEGIN

dbms_auto_task_admin.enable(

client_name => 'sql tuning advisor',

operation => NULL,

window_name => NULL);

END;

更多Oracle相关信息见 Oracle 专题页面 http://www.linuxidc.com/topicnews.aspx?tid=12

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