Updating statistics sql 2016 r2
He demos the trace flag in a video for the SQL Skills Insider Newsletter where he shows the changes in locking behavior this flag introduces.
Download the video in WMV format or MOV format to watch. If I had a really good reason to run concurrent statistics updates against one table after exhausting other options to avoid the maintenance, I’d consider using this.
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If you’re interested in that, head on over and read the fahhhbulous white paper, Statistics Used by the Query Optimizer in SQL Server 2008. Unfortunately, Aristotle was right when it comes to statistics maintenance in SQL Server. This is because you didn’t do any proactive work at all.
Statistics will continue to be created on single columns when queries run as long as the “Auto Create Statistics” database property remains on.
You can check that setting on your databases with the query: You should leave auto_create_stats_on set to 1 unless an application is specifically designed to manually create its own statistics.
If you have multiple SQL Servers using shared storage, that maintenance may hit the storage at the same time. ⇒ The moderate approach: One widely used free script is Ola Hallengren’s SQL Server Index and Statistics Maintenance script.
If you’re managing lots of SQL Server instances and want ultimate customization, there is a free version of Minion Reindex. The answers to both of these questions impact what it does to GROUP those rows and SUM the Name Count column.
The thresholds for when auto-update statistics kicks in are a little complicated.