优化sql的利器SQLT是怎么样的

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：

sql优化功底不是很深的同学

sql太复杂（2000行以上的SQL）

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

…

DefineSQLTXPLaiN password (hidden and case sensitive).

PassWordfor user SQLTXPLAIN:

Re-enterpassword:

…

Defaulttablespace [UNKNOWN]: USERS  <== hidden and case sensitive

…

Temporarytablespace [UNKNOWN]: TEMP  <== hidden and case sensitive

…

Mainapplication user of SQLT: doudou    <==administrator;grant SQLT_USER_ROLE

…

oraclePack license [T]: T  <==choose

…

SQCREATEcompleted. Installation completed successfully.

Remove SQLT Method：

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

SQL> start sqltxtract.sql 0w6uydn50g8c <=SQLsql_id

Administrator privilege

grantconnect,resource to doudou;

grantSQLT_USER_ROLE to doudou;

Whatis different SQLT XECUTE Method and SQLT XTRACT Method ?

SQLT XECUTE Method

? Pros

?Accurate 10053 (considers bind peeking)

? Planexecution statistics (sets STATISTICS_LEVEL=ALL)

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

?Invokes SQL Tuning Advisor

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

?10046 trace and Trace Analyzer (if installed)

? Cons

? SQLis executed (may take long time)

? Needto 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

? SQLis not executed

? Noneed to know the values of bind variables

? Easyto execute (if hash_value or sql_id are known)

? Cons

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

beaccurate 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 

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