优化sql的利器SQLT是怎么样的-创新互联
优化sql的利器SQLT是怎么样的，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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]: T <==choose
…
SQCREATE completed. Installation completed successfully.
Remove SQLT Method：
@/home/oracle/sqlt/install/sqdrop.sql
SQL> start sqltxtract.sql 0w6uydn50g8c <=SQL sql_id
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
优化SQL的又一利器SQLT（SQLTXPLAIN），SQLT把收集的信息和建议方法都形成了html（main.html;readme.html;lite.html）格式，方便用户查看！
Main.html：SQLT给出了收集的信息和调优建议
Readme.html：SQLT给出了具体优化的方法
Lite.html:SQLT给出了简易的PLANS信息
Document 215187.1
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