P000、P001、P002和P003进程称为并行执行服务器（parallel execution server），有时也称为并行查询（parallel query，PQ）从属进程。
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如果使用并行处理，服务器可以按照任何顺序执行成批请求。
In case of parallel processing, the server can execute the batched requests in any order.
主服务器的日志写入和对于备用服务器的发送在主服务器上是并行执行的。
The log write at the primary and the send to the standby are performed in parallel on the primary server.
哪怕是最简单的一个对象，都有可能需要执行一些脚本——服务器也因此要对其进行大量的并行运算。
Even the simplest objects may have some scripting attached to them and a given server may be running hundreds of them simultaneously.
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