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ALTER TABLE ALTER COLUMN failed because one or more objects access this column

2018-07-19 · by Hannah Vernon · in Internals, performance

There are a variety of causes for the message shown in the title of this post. Manually creating statistics for a column is one such cause. This post shows how that works, and what you…

Can statistics be updated for objects in read-only filegroups?

2016-04-14 · by Hannah Vernon · in Internals

DBA.StackExchange.com has an interesting question about the benefits of filegroups and setting filegroups to read-only which I recently answered. I made several assumptions about read-only filegroups that turned out to be incorrect, one of which…

SQL Server Timer Source

2015-06-09 · by Hannah Vernon · in Internals

Recently, I’ve been looking for a way to better understand timings on SQL Server, and have been intrigued to see that SQL Server can use one of several different mechanisms to determine precision and resolution…

Use DBCC PAGE to identify rows involved in blocking operations in SQL Server

2015-03-03 · by Hannah Vernon · in Internals

Recently, one of my customers complained about a BizFlow database that was “running slowly”. BizFlow uses SQL Server to store data used in business processes – in this implementation there is a main BizFlow database,…

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