When tempdb Spills Attack

Josh Darnell ran into a problem with a SQL Agent job:

One of my colleagues reached out to me recently about a production issue where a SQL Server Agent job had failed with this error message:

Msg 1105, Level 17, State 2, Line 15
Could not allocate space for object ‘dbo.SORT temporary run storage: 140737513062400’ in database ‘tempdb’ because the ‘PRIMARY’ filegroup is full. Create disk space by deleting unneeded files, dropping objects in the filegroup, adding additional files to the filegroup, or setting autogrowth on for existing files in the filegroup.

I fully expected this to be a scheduled maintenance task, like index rebuilds or statistics updates. I’ve seen this error before in those contexts (rebuilding large indexes in tempdb, or updating statistics with FULLSCAN).

But watch as SQL Server subverts Josh’s expectations.

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