Oracle 等待事件之 db file parallel read

标签：oracle 等待事件之 db file parallel read

db file parallel read

官网解释：

    This happens during recovery. It can also happen during buffer prefetching, as an optimization (rather than performing multiple single-block reads). Database blocks that need to be changed as part of recovery are read in parallel from the database.

Wait Time: Wait until all of the I/Os are completed

解释：

    db file parallel read 这在恢复期间发生。 它也可能在缓冲区预取期间发生，作为优化（而不是执行多个单块读取）。 从数据库并行读取需要作为恢复一部分进行更改的数据库块。

本文出自 “Linux Oracle MariaDB” 博客，请务必保留此出处http://wangergui.blog.51cto.com/8504247/1912804

Oracle 等待事件之 db file parallel read

标签：oracle 等待事件之 db file parallel read

原文地址：http://wangergui.blog.51cto.com/8504247/1912804