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Free Disk Space by Clearing Columns ?


Free Disk Space by Clearing Columns ?

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homebrew01
homebrew01
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I have a huge archive table in a lightly used archive database. We really don't need all the data in each row, and I was considering updating a lot of columns to NULL. Will that free up space for reuse, either with or without shrinking the database file ? I don't want to actually drop the unneeded columns because I might break applications that populate & use the table, but I would like to reclaim space.

(SQL 2008 R0, std ed.)



GilaMonster
GilaMonster
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You'll definitely need to rebuild the clustered index to release the free space into the data file for reuse by other tables, may need to run DBCC CleanTable as well


Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
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Jeff Moden
Jeff Moden
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I also believe that type of thing will only work on variable length columns, as well.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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arnipetursson
arnipetursson
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You might want to consider table/index compression.

Edit: Sorry did not notice it was standard edition. Data compression not available
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