端点选择、接口端点和订阅缓存还未使用，因此我们当前将不优化它们的参数。

The endpoint selection, interface endpoints, and subscription caches are not yet used, so we will not tune their parameters at this time.

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一旦理解了自己的选择，就可以通过调整OPTCOMPIND参数，或者通过添加查询指示或索引，来影响优化器，从而选择最佳的查询执行计划。

Once you understand your options, you can influence the optimizer to select the best query execution plan, either by adjusting the OPTCOMPIND parameter or by adding query directives or indexes.

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正如我们在本文讨论的，如果sql语句中存在主机变量或参数标记，那么DB 2优化器可能会选择一个次优化的存取计划。

As we've discussed in this article, the DB2 optimizer may choose a sub-optimal access plan when there are host variables or parameter markers in the SQL statement.

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