If Prepares are frequent, try a lower optimization class.

如果经常要准备语句，那么可以试着调低优化级别。

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The query optimization class is used to direct the optimizer to use different degrees of optimization when compiling SQL queries

查询优化类用于在编译 SQL 查询时指导优化器使用不同的优化级别。

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An operator class is used in conjunction with the access method to specify the operators used for building the index and during query optimization.

将操作符类与访问方法结合使用，可以指定创建索引和优化查询时使用的操作符。

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You can see how content marketing and conversion rate optimization are at the head of the class.

FORBES: Content Marketing And E-Commerce Tops Digital Marketers Priority List For 2013