Session Wait Stats

SQL Server 2016 has a per-session wait stats DMV:  sys.dm_exec_session_wait_stats.  That’s exciting; wait stats are extremely interesting, but until now, impossible to use on a per-item level in a busy production system (where you’d most want to use them).

Daniel Farina looks at how the new DMV relates to sys.dm_exec_wait_stats (via Database Weekly):

[R]esetting the data of sys.dm_os_wait_stats operating system view doesn’t affect the values of sys.dm_exec_session_wait_stats view.

Based on my MSDN reading, the sys.dm_exec_session_wait_stats DMV resets if the connection pool context is re-used or if the session closes.  This is why DBCC SQLPERF doesn’t include a reset option for session-specific wait stats.

Related Posts

Access Violation Error In SQL Server 2016 SP2 CU4

Lonny Niederstadt tracked down an ugly bug in SQL Server 2016 SP2 CU4: When I started investigating, the error was known only as an access violation, preventing some operations related to data cleansing or fact table versioning. It occurred deep within a series of stored procedures.  The execution environment included cross-database DELETE statements, cross-database synonyms, […]

Read More

Tooling For SQL Server Automation With Powershell

Max Trinidad shares some tools you can use to automate SQL Server processes with Powershell: For script automation we could install either or both version of PowerShell Core: (As of February 19th, 2019)PowerShell Core GA version 6.1.3PowerShell Core Preview 6.2.0 Preview 4 Here are some important PowerShell Modules to use for SQL Server management scripting:*SQLServer – […]

Read More

Categories

November 2015
MTWTFSS
« Jan Dec »
 1
2345678
9101112131415
16171819202122
23242526272829
30