Queries can be of two types: recursive and non-recursive.

查询可以具有两种类型：递归和非递归。

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There are two types of non-recursive locks: fast and slow.

有两种类型的 非递归锁：快的和慢的。

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There are two types of non-recursive locks: fast and slow.

有两种类型的 非递归锁：快的和慢的。

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