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优化sql的利器SQLT

原创 Linux操作系统 作者:lovehewenyu 时间:2013-10-15 10:48:48 0 删除 编辑

优化sql的利器SQLT

 

Sqlt适用环境:

1、 sql优化功底不是很深的同学

2、 sql太复杂(2000行以上的SQL

3、 快速优化sql,不考虑业务逻辑

 

Setup SQLT Method

SQL> conn /as sysdba

SQL> @/home/oracle/sqlt/install/sqcreate.sql

Define SQLTXPLAIN password (hidden and case sensitive).

Password for user SQLTXPLAIN:

Re-enter password:

Default tablespace [UNKNOWN]: USERS  <== hidden and case sensitive

Temporary tablespace [UNKNOWN]: TEMP  <== hidden and case sensitive

Main application user of SQLT: doudou    <==administrator;grant SQLT_USER_ROLE

Oracle Pack license [T]:<==choose

SQCREATE completed. Installation completed successfully.

 

Remove SQLT Method

@/home/oracle/sqlt/install/sqdrop.sql

 

使用方法:

SQL> start sqltxtract.sql 0w6uydn50g8c <=SQL sql_id

 

附表:

Administrator privilege

grant connect,resource to doudou;

grant SQLT_USER_ROLE to doudou;

 

What is different SQLT XECUTE Method and SQLT XTRACT Method ?

 

SQLT XECUTE Method

? Pros

? Accurate 10053 (considers bind peeking)

? Plan execution statistics (sets STATISTICS_LEVEL=ALL)

? Actual Execution Plan (may be different than explain plan)

? Invokes SQL Tuning Advisor

? No need to know, or get before hand, hash_value or sql_id

? 10046 trace and Trace Analyzer (if installed)

? Cons

? SQL is executed (may take long time)

? Need to know the values of bind variables

 

SQLT XTRACT Method

? Pros

? Child plans and plan statistics (if STATISTICS_LEVEL=ALL)

? Actual Execution Plan (may be different than explain plan)

? Invokes SQL Tuning Advisor

? SQL is not executed

? No need to know the values of bind variables

? Easy to execute (if hash_value or sql_id are known)

? Cons

? 10053 is generated based on EXPLAIN PLAN FOR (may not

be accurate due to binds peeking)

? Requires to know, or get before hand, hash_value or sql_id

 

 

总结:

优化SQL的又一利器SQLTSQLTXPLAIN),SQLT把收集的信息和建议方法都形成了htmlmain.html;readme.html;lite.html)格式,方便用户查看!

Main.htmlSQLT给出了收集的信息和调优建议

Readme.htmlSQLT给出了具体优化的方法

Lite.html:SQLT给出了简易的PLANS信息 

 

参考文献:Document 215187.1

来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/26442936/viewspace-774380/,如需转载,请注明出处,否则将追究法律责任。

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