如何捕捉process中引起performance issue的sql的execution plan

jacksan

我這裡有個Jasper Report機能，sql是通過Java提交到Oracle，
然後就發現有個Oracle進程佔用100%的cpu，大概會持續1分
多鐘，才能返回結果，有時候會需要更長時間，導致apache
timeout。

本來正常情況下，只需要幾秒鐘的時間，可是從2個禮拜前，
就開始變得很慢。客戶也開始有抱怨發出來了，客戶的環境
是Redhat Linux 64bit+Oracle 64bit EE。

但是在我們開發環境下Redhat Linux 64bit+Oracle 64bit SE1，
無法再現。

我想通過分析現場的execution plan來判斷一下問題的根源。
如何捕捉這個問題sql的execution plan?

可以用ALTER SYSTEM SET events '10046 trace name context forever, level 8'嗎？
（這樣的做的話，會有很多trace產生）

有沒有其他好的方法？


補充：
即使發現客戶現場的execution plan不是很好，也不能把開發
環境的execution plan應用到現場吧？

xin_chy

建议 ：
    1、做oracle AWR 报表，根据awr报表中的SQL Statistics 部分找到性能差的SQL ；
    2、使用select plan_table_output from table (dbms_xplan.display_awr(‘&sql_id’,null,null,‘ADVANCED +PEEKED_BINDS’));查看执行计划；

jacksan

以前做過AWR，但是SQL Statistics部份沒有數據，估計我這裡的Oracle是SE1的原因。
是不是需要安裝statpack？？

SQL Statistics

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