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Delete 29 million rows from 1 billion rows table. (SQL Server 2008)

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Last Modified: 2012-05-10
I need suggestions from experts.
I need to delete 29 million rows from 1 billion rows table.  This is SQL Server 2008.
I am sure foillowing query will work. I know that it will take an couple of hours or more to run it.
Does anybody have any suggestions/improvments in following queries? My main aim is to have these queries consume minimum resources and avoid 'transaction log full' error.


      Declare @rows int
      set @rows= 1

      WHILE @rows > 0
      begin
             DELETE TOP (100000) FROM HugeTable
             Where Key < 29660822
                   
             set @rows = @@ROWCOUNT

             CHECKPOINT
      end
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Guy Hengel [angelIII / a3]Billing Engineer
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Commented:
it will only avoid that error if you put a WAITFOR DELAY into the loop, and ensure you have transaction log backups running during that "time" ...otherwise, you could also "delete at once ..."
Lara FEA
CERTIFIED EXPERT

Commented:
If you don't need maintain txn log for this DB
you can add this after update to avoid tempdb full error.
backup log databaseName with truncate_only


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