It specifies a sequence of operations that involve resources, such as databases.

它指定包括资源(如数据库)的一系列操作。

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The UNION operator reads data from each SHIP buffer, one buffer at a time. The sequence of operations is as follows

而 UNION 操作符则从每个 SHIP 缓冲区中读取数据，每次读取一个缓冲区。

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The performance test code first reads the documents to be used in the test into memory, then runs through a sequence of operations on the documents.

性能测试代码首先将测试中使用到的文档读入到内存中，然后对文档进行一系列的操作。

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