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oracle穩定執行計劃1

時間：2014-04-28 02:58:22 阅读：678 評論：0 收藏：0 [點我收藏+]

標簽：strong line int rac sql oracle file ase 應用統計信息執行計劃

稳定執行計劃 1

策略：

　　

Oracle的sql 執行計劃在一些场景下会发生变化，导致系统会发生不可知的情况，影响系统的稳定性，特别是关键业务的sql。

比如下面的場景：　　

統計信息过老，重新收集了統計信息。
爲表添加了新的分區，刪除分區。

而oracle提供的稳定執行計劃的策略也大致有：

存储纲要（stored outlines）
Sql 基线（sql baseline 11g）
Sql profile
Hint

在这几种方式中，在應用端任何的sql变动都会使stored outlines， sql baseline， sql profile的方式失效。

Hint的方式虽然没有这个问题，但每一次的使用都要更改應用程序代码，應用的场景也会受限。

下面的系列文章主要从統計信息的角度去讨论稳定執行計劃。

oracle穩定執行計劃1,码迷,mamicode.com

oracle穩定執行計劃1

標簽：strong line int rac sql oracle file ase 應用統計信息執行計劃

原文地址：http://www.cnblogs.com/xpchild/p/3694993.html

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