The database session stores these query logs in memory and periodically commits the local history to disk.

数据库会话在内存中保存这些查询日志，并定期将本地历史写入磁盘。

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We first issue the main query from one session (SESSION1 in this example) that we would like to see the runtime section explain for.

我们首先在第一个会话中(本例中是SESSION1)发出主查询，这样我们就能够得到运行时片段解释的目标。

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If star join directives are used in a query, directives override session environment setting.

如果查询中使用星型连接指令，指令会将会话环境设置覆盖。

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