優化sql的利器SQLT是怎么樣的

優化sql的利器SQLT是怎么樣的，相信很多沒有經驗的人對此束手無策，為此本文總結了問題出現的原因和解決方法，通過這篇文章希望你能解決這個問題。

優化sql的利器SQLT

Sqlt適用環境：

1、sql優化功底不是很深的同學

2、sql太復雜（2000行以上的SQL）

3、快速優化sql，不考慮業務邏輯

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

優化SQL的又一利器SQLT（SQLTXPLAIN），SQLT把收集的信息和建議方法都形成了html（main.html;readme.html;lite.html）格式，方便用戶查看！

Main.html：SQLT給出了收集的信息和調優建議

Readme.html：SQLT給出了具體優化的方法

Lite.html:SQLT給出了簡易的PLANS信息 

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