If the table in your query are pretty small (usually fewer than 1,000 rows) or clustered tables, and your query is not selective at all, it would be beneficial to use a table scan.
如果查询中的表极其小(通常少于1,000行)或者是群集表，而且查询根本没有选择性的话，那么使用表扫描会更好一些。
This is usually the second worst performing strategy due to its cache lock requirement and the heavy "push" update policy for clustered caches.
这通常是性能倒数第二的策略，因为它要求有缓存锁，缓存集群中使用重量级的“推”更新策略。
Logging in a clustered environment, however, requires more planning because messages are generated from different sources (usually different machines).
然而，集群环境中的日志需要更多规划，因为消息都是从不同的源头生成的(通常是不同的机器)。
Aggregate fruit Usually applied to a cluster or group of small fleshy fruits originating from a number of separate pistils in a single flower, as in the clustered drupelets of the raspberry.
聚合果通常指由单花的许多离生雌蕊形成的一簇或一组小型肉质果，如悬钩子的簇生小坚果。
Aggregate fruit Usually applied to a cluster or group of small fleshy fruits originating from a number of separate pistils in a single flower, as in the clustered drupelets of the raspberry.
聚合果通常指由单花的许多离生雌蕊形成的一簇或一组小型肉质果，如悬钩子的簇生小坚果。
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