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通过绑定变量优化OLTP系统性能

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Release： 2016-06-07 16:44:24
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之前给南京某客户优化一套OLTP数据库，其数据库中在某个时间段，会执行大量结构非常相似的查询语句，造成shared_pool被大量占用，

分析：刚才的那段PL/SQL的语句被硬解析了10000次，并且执行了10000次，CPU总共消耗了6.26+0.23=6.50，花费时间6.53+0.26=6.79，可以看到，在trace文件中共有90068行，由于同样结构的SQL语句，未使用绑定变量，使Oracle认为每个语句都不同，因此产生了非常多的SQL语句，，zlm01.log日志文件大小约为12M。

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