TempDB on Andy M Mallon - AM²

Stop trying to shrink tempdb files

Tue, 28 Apr 2020 09:00:24 -0400

Every time someone shrinks a database, a kitten dies.

Stop shrinking your tempdb data files

I recently wrote about growing, shrinking, and removing tempdb files. In that article I explained that SQL Server won’t move a page that contains an internal worktable object, and thus trying to shrink tempdb files can be futile. Today, I’m going to explain how attempting to shrink tempdb files can actually be harmful.

Fixing tempdb: Growing, shrinking, and removing data files

Tue, 21 Apr 2020 09:00:37 -0400

Dropping tempdb files like they're hot

I recently came across a server where tempdb was breaking all the rules.

Data files were all different sizes. I want all data files to be the same size so that proportional fill uses them evenly.
There were 10 tempdb files, with 8 files on a dedicated disk, and 2 on a slower disk shared with other data files. And free space was sky high, so the extra files aren't needed anymore! (They were probably added to fix a short-term emergency, and never cleaned up.)
The log file was tiny, and didn't have room to grow. For a 500GB tempdb, the log file was only 4GB!

Three fixes

There are three problems I’ve got to fix. I need to (1) remove those two extra files, (2) grow the tempdb log file, and (3) even out the size of the data files (and shrink them a little to make room for the larger log file. We’re going to tackle these in the reverse order than I listed them–partially out of necessity, and partially because it’s going to be easier.

Is it possible for master, tempdb, model and msdb to have a database_id other than 1,2,3,4 respectively?

Wed, 12 Feb 2020 12:25:11 -0500

Question

SQL Server System Databases, as far as I know, always have those same IDs and I have seen lots of maintenance scripts on the internet relying on the predicate WHERE database_id > 4 to exclude them from the actions of the script.

Cannot connect to my SQL Management studio after moving a tempDB

Fri, 01 Nov 2019 22:27:39 -0400

Question

In quite a bad position here. This afternoon on my tempDB I ran the query: sp_helpfile to locate where my MDF and LOG file were. My MDF was on my C: drive and my LOG file was on a D: drive so I've run the following query to move this Log file from the D: drive back to C: drive. (This may not have been exactly the query I run as I don't remember what it was precisely!)