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。
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。
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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