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If I don't already have any logging in place, is there any way to use the DMVs or anything else on SQL Server to determine which query / event caused my database's last grow operation?

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You could use the undocumented function sys.fn_dblog filtering by the collumn transaction name like this:

SELECT [Transaction Name] 
FROM sys.fn_dblog(NULL,NULL) 
WHERE [Transaction Name] IS NOT NULL;

On the query result you should look for SetFileSize

Query result

The line before the SetFileSize will show the last event that occured to cause the growth.

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