在执行长时间的IO密集的操作时,SQL Server进程经常会发生ASYNC_IO_COMPLETION等待,同时会在Error Log中记录 “I/O requests are taking longer than 15 seconds to complete” 消息,IO密集的操作主要有:backup/restore操作,新建一个大的数据库文件,和数据库文件增长。长时间执行IO密集操作,本来就需要大量的IO才能完...
总之:在数据库备份或还原的过程中,出现长时间的ASYNC_IO_COMPLETION 等待,表示backup/restore操作正在等待获取IO资源,导致backup/restore 进程处于挂起状态(suspended),只有获取到IO资源,该操作才会继续进行下去。 在执行长时间的IO密集的操作时,SQL Server进程经常会发生ASYNC_IO_COMPLETION等待,同时会在Error Log中记录 ...
ASYNC_IO_COMPLETION和ASYNC_NETWORK_IO。 前一个是等待I/O操作完成的等待,后一个是等待I/O在网络上完成的等待 SQL Server 数据页缓冲区的内存瓶颈分析 http://www.jb51.net/article/30992.htm 日志原理与优化.pdf https://files.cnblogs.com/lyhabc/%E6%97%A5%E5%BF%97%E5%8E%9F%E7%90%86%E4%B8%...
在执行长时间的IO密集的操作时,SQL Server进程经常会发生ASYNC_IO_COMPLETION等待,同时会在Error Log中记录 “I/O requests are taking longer than 15 seconds to complete” 消息,IO密集的操作主要有:backup/restore操作,新建一个大的数据库文件,和数据库文件增长。长时间执行IO密集操作,本来就需要大量的IO才能完...
We have a consultant who is suggesting that our long running backup is surely tied to a poorly set up storage/disk/infrastructure because we're seeing this ASYNC_IO_COMPLETION lastwaittype. But you're saying that isn't true. This lastwaittype is normal for a backup job. If that is the...
在SQL Server 2012(11.0.7001.0)下面在还原一个数据库(备份文件40多G大小,实际数据库大小300G),在还原过程中,出现一直等待ASYNC_IO_COMPLETION,如下测试截图所示,已经等待了72分钟了,但是还原比例依然为0% SELECT r.session_id , 1. r.command , 1. ...
IO Completion Port: IO Completion Port is a kernel object which can be associated with a number of I/O objects like file, socket or a pipe. When an asynchronous operation is started on the I/O objects that have been associated with the IO Completion Port, the calling thread returns immedi...
IWDTFSimpleIOStressAction2::WaitAsyncCompletion method (wdtfinterfaces.h) Article 02/22/2024 Feedback In this article Syntax Parameters Return value Requirements See also Waits for the completion of any of the asynchronous events. Syntax C++ ...
HRESULT WaitAsyncCompletion( [out, retval] VARIANT_BOOL *pResult ); 参数[out, retval] pResult如果最后一个异步事件成功,则为 True;否则为 false。返回值如果该方法成功,则返回 S_OK。 否则,将返回 HRESULT 错误代码。要求展开表 要求值 最低受支持的客户端 Windows XP Professi...
Waits for the completion of any of the asynchronous events. Syntax C++ Copy HRESULT WaitAsyncCompletion( [out, retval] VARIANT_BOOL *pResult ); Parameters [out, retval] pResult True if the last asynchronous event succeeded; otherwise, false. Return value If this method succeeds, it returns...