sql tuning advisor使用
DB tuning advisor是创建优化任务,对某些sql数据库进行分析,并尽量给出优化建议的一个强大的数据库工具。
自己平时几乎没用过这玩意,所以来测一测用法,其实对于一些sql一筹莫展的时候跑跑这个,看看数据库的建议也是一个突破点。
一般利用database tuning advisor的顺序:
- 找出要去优化调整的sql_id,创建优化任务
Login as SYSTEM (or any other user) at sqlplus and create the tuning task:
SET SERVEROUTPUT ON
declare
stmt_task VARCHAR2(40);
begin
stmt_task := DBMS_SQLTUNE.CREATE_TUNING_TASK(sql_id => 'gf27vxf3rz2x7',time_limit=>600);
DBMS_OUTPUT.put_line('task_id: ' || stmt_task );
end;
/
task_id: TASK_43083
注:time_limit以秒为单位,就是这个优化任务最多跑多久,最大3600S,但一般都很快可以跑完,当然在跑这个优化任务的时候,数据库会去模拟执行sql或者其中一部分。
当然也可以直接把sql text作为输入
2. Run the SQL TUNING TASK
begin
DBMS_SQLTUNE.EXECUTE_TUNING_TASK(task_name => 'TASK_43083');
end;
/
3. monitor the processing of the tuning task with the statement
SELECT TASK_NAME, STATUS FROM DBA_ADVISOR_LOG WHERE TASK_NAME = 'TASK_43083';
SELECT status FROM dba_ADVISOR_TASKS WHERE task_name ='TASK_43083';
4. When the task has a status=COMPLETED, then run:
SELECT DBMS_SQLTUNE.REPORT_TUNING_TASK('TASK_43083') AS recommendations FROM dual;
5. Examine the recommendations from Oracle, in case you agree, then accept the best SQL profile.
begin
DBMS_SQLTUNE.ACCEPT_SQL_PROFILE(task_name => 'TASK_43083', task_owner => 'SYSTEM', replace => TRUE);
end;
/
6. You can check the database sql profiles with the statement:
select * from dba_sql_profiles;
In case you want to disable an sql profile use the statement:
begin
DBMS_SQLTUNE.ALTER_SQL_PROFILE('SQL_PROFILE','STATUS','DISABLED');
end;
/
========================================================
如下是实际在sqlplus和OEM下的操作:
SQL> SET SERVEROUTPUT ON
SQL> declare
2 stmt_task VARCHAR2(40);
3 begin
stmt_task := DBMS_SQLTUNE.CREATE_TUNING_TASK(sql_id => 'gf27vxf3rz2x7',time_limit=>600);
DBMS_OUTPUT.put_line('task_id: ' || stmt_task );
end;
/ 4 5 6 7
task_id: TASK_43083
PL/SQL procedure successfully completed.
SQL> begin
2 DBMS_SQLTUNE.EXECUTE_TUNING_TASK(task_name => 'TASK_43083');
3 end;
/ 4
PL/SQL procedure successfully completed.
SQL> SELECT status FROM dba_ADVISOR_TASKS WHERE task_name ='TASK_43083';
STATUS
-----------
COMPLETED
SQL> SELECT TASK_NAME, STATUS FROM DBA_ADVISOR_LOG WHERE TASK_NAME = 'TASK_43083';
TASK_NAME STATUS
------------------------------ -----------
TASK_43083 COMPLETED
SQL> SELECT DBMS_SQLTUNE.REPORT_TUNING_TASK('TASK_43083') AS recommendations FROM dual;
RECOMMENDATIONS
--------------------------------------------------------------------------------
GENERAL INFORMATION SECTION
----------------------------------------------------
在这里没有recommend推荐,所以没内容
SQL> SELECT * FROM DBA_ADVISOR_TASKS T WHERE TASK_NAME='TASK_43083';
OWNER TASK_ID TASK_NAME DESCRIPTION ADVISOR_NAME CREATED LAST_MODI PARENT_TASK_ID PARENT_RXEC_ID LAST_EXECUTION EXECUTION_TYPE EXECUTION_TYPE# EXECUTION_DESCRIPTION EXECUTION EXECUTION STATUS
----------------------------------------------------------------- ------------------------------ --------- --------- -------------- -------------- ------------------------------ ------------------------------ --------------- ---------------------------------------STATUS_MESSAGE
PCT_COMPLETION_TIME PROGRESS_METRIC METRIC_UNITS ACTIVITY_COUNTER RECOMMENDATION_COUNT
------------------- --------------- ---------------------------------------------------------------- ---------------- --------------------
ERROR_MESSAGE
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------SOURCE HOW_CREATED READ_ SYSTE ADVISOR_ID STATUS#
------------------------------ ------------------------------ ----- ----- ---------- ----------
SYS 43083 TASK_43083 SQL Tuning Advisor 21-DEC-16 21-DEC-16 0 0 EXEC_43064 TUNE SQL 1 21-DEC-16 21-DEC-16 COMPLETED
0 0 0 0
CMD FALSE FALSE 4 3
从这里也可以看到RECOMMENDATION_COUNT为0,说明tuning advisor没啥建议。Task name为TASK_43083,task id为43083.
SQL> SELECT * FROM DBA_SQLTUNE_STATISTICS;
TASK_ID OBJECT_ID PARSING_SCHEMA_ID MODULE ACTION ELAPSED_TIME CPU_TIME BUFFER_GETS DISK_READS DIRECT_WRITES ROWS_PROCESSED FETCHES EXECUTIONS END_OF_FETCH_COUNT OPTIMIZER_COST OPTIMIZER_ENV COMMAND_TYPE
---------- ---------- ----------------- ---------------------------------------------------------------- ---------------------------------------------------------------- ------------ ---------- ----------- ---------- ------------- -------------- ---------- ---------- ------------------ -------------- --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ------------
43083 1 JDBC Thin Client 4.3835E+10 1879546000 143899706 143034103 0 20730472 20732 4 4 657055 E289FB89E426A8004E011000AEF5C3E2CFFA331056414551519521105555551545545558591555449665851D5511058555555155515122555415A0EA0C55514542654554544490A1566E021696C6A75545150502541552441615579110A8456E820A5000030020000000000100001000000002002080007D000000000032000 3
SQL> SELECT * FROM DBA_SQLTUNE_BINDS;
no rows selected
SQL> SELECT * FROM DBA_SQLTUNE_PLANS WHERE TASK_ID='43083';
SQL> SELECT TO_CHAR(execution_start,'dd-mon-yyyy hh24:mi:ss') || ' -> ' || TO_CHAR(execution_end,'dd-mon-yyyy hh24:mi:ss') AS execution_time,
2 status,status_message,pct_completion_time
3 FROM DBA_ADVISOR_LOG
WHERE task_name='TASK_43083'; 4
EXECUTION_TIME STATUS
-------------------------------------------------------------- -----------
STATUS_MESSAGE
------------------------------------------------------------------------------------
PCT_COMPLETION_TIME
-------------------
21-dec-2016 08:45:18 -> 21-dec-2016 08:45:33 COMPLETED
0
================================================
USED SQL SUMMARY:
SELECT * FROM DBA_ADVISOR_TASKS T WHERE TASK_NAME='TASK_43083';
SELECT * FROM DBA_SQLTUNE_STATISTICS
SELECT * FROM DBA_SQLTUNE_BINDS
SELECT * FROM DBA_SQLTUNE_PLANS WHERE TASK_ID='43083'
SELECT TO_CHAR(execution_start,'dd-mon-yyyy hh24:mi:ss') || ' -> ' || TO_CHAR(execution_end,'dd-mon-yyyy hh24:mi:ss') AS execution_time,
status,status_message,pct_completion_time
FROM DBA_ADVISOR_LOG
WHERE task_name='TASK_43083';
==============================================================
OEM下的就简单很多了,点几下就够了:
选择sql tuning adviser:
这里的name可以自己定义,系统也会生成,即task name
总的时间限制30mins,comprehensive的分析范围,立即分析。这些都默认的就可以。
等待一下,正在执行优化任务
这里没什么推荐的所以为空,点击SPA Validation results看看是什么
如果有recommend生成的话,这个SPA是可以给新的优化来做测试的。
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