EXECsp_GetRowSize'sysmail_mailitems','mailitem_id' 原因倒也不复杂,就是生成邮件的SQL出现逻辑错误,导致邮件的Body变得无比巨大,导致msdb.dbo.sysmail_allitems变得非常大,与之相关的SQL语句IO性能变差,出现ASYNC_NETWORK_IO等待。其实以前也遇到过类似案例,请见SQL Server
DPA监控发现一台SQL Server服务器最近两天执行系统存储过程msdb.dbo.sp_MailItemResultSets中的某个SQL时,出现较严重的ASYNC_NETWORK_IO等待。如下截图所示 进一步分析发现,主要是执行存储过程msdb.dbo.sp_MailItemResultSets中下面这段SQL语句出现ASYNC_NETWORK_IO等待 SELECT 1. mi.mailitem_id, 1. mi.profile_i...
The “async network io” (in SQL 2005/2008) and “networkio” (in SQL 2000) wait types can point to network related issues, but most often are caused by a client application that is not processing results from the SQL Server quickly enough. This will result in filling the network buffers...
SQL 研讨会 2016年6月6日 在SQL Server 中,由于网络速度缓慢,ASYNC_NETWORK_IO等待时间可能很高,例如数据库在云中且应用程序位于本地时。 此外,当应用程序服务器中的 CPU 使用率较高,导致无法及时提取所有行,或者在大多数情况下,当应用程序读取行时,会执行一些工作来处理该行,然后再读取下一行。 服务器发送数据...
ASYNC_NETWORK_IO 或NETWORK_IO翻译自:https://mssqlwiki.com/sqlwiki/sql-performance/async_network_io-or-network_io/什么是 ASYNC_NETWORK_IO 或NETWORK_IO ?当查询执行时,SQL Server处理结果,并将它放到输出缓存,发送给客户端或应用程序。客户端或应用程序然后从 ...
WHERE [wait_type] NOT IN ( N'CLR_SEMAPHORE', N'LAZYWRITER_SLEEP', N'RESOURCE_QUEUE', N'SQLTRACE_BUFFER_FLUSH', N'SLEEP_TASK', N'SLEEP_SYSTEMTASK', N'WAITFOR', N'HADR_FILESTREAM_IOMGR_IOCOMPLETION', N'CHECKPOINT_QUEUE', N'REQUEST_FOR_DEADLOCK_SEARCH', ...
As you may already be aware, the ASYNC_NETWORK_IO (seen in SQL 2005) and NETWORKIO (seen in SQL 2000) wait types are associated with either a calling application that is not processing results quickly enough from SQL Server or is associated with a network performance issue. As I received...
Satish Kartan www.sqlfood.comSunday, February 8, 2015 9:52 PM | 1 voteCan anyone please explain how is NOLOCK hint useful in reducing ASYNC_NETWORK_IO wait ?Kalman was confused when he said that. Adding the NOLOCK hint can possibly mitigate the damage caused by a slow client, but it...
ASYNC_NETWORK_IO name is adopted starting from SQL Server 2005, while in SQL Server 2000 this wait type is known as NETWORKIO. The original name of this wait type originates from the period of the slow Ethernet speeds of 10 Megabits and 100 Megabits that are commonly in use until the ...
What is ASYNC_NETWORK_IO or NETWORK_IO ? When a query is fired, SQL Server produces the the results ,place it in output buffer and send it to client/Application. Client/Application then fetch the result from the Output buffer, process data and send ac