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Executing a select statement in batches

Posted on 2012-04-12
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Last Modified: 2012-04-12
Hi,

I would like to take this statement:

delete from table where date <= '12/31/2000'

This coudl result in over 10,000,000 rows or more.

I want to do this in batches of 20,000 in a script. Any suggestions on the best way to do this?

Thanks,

Basil
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Question by:Auerelio Vasquez
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3 Comments
 
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Accepted Solution

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lcohan earned 2000 total points
ID: 37839964
You should look at SET ROWCOUNT = xxx and use that to build your batch delete
http://msdn.microsoft.com/en-us/library/ms188774(SQL.105).aspx

smething like:

SET ROWCOUNT 2000
      DECLARE @rc int
      SET @rc=2000
      WHILE @rc=2000
BEGIN
      delete from orders with (rowlock) where chargestatus = 8
    SELECT @rc=@@rowcount
END
SET ROWCOUNT 0
0
 
LVL 40

Expert Comment

by:lcohan
ID: 37839976
Or to be more speciffic:


SET ROWCOUNT 20000
      DECLARE @rc int
      SET @rc=20000
      WHILE @rc=20000
BEGIN
     delete from table where date <= '12/31/2000'
     SELECT @rc=@@rowcount
END
SET ROWCOUNT 0

and m,ake sure you have a index on table.date column and you could include a

UPDATE STATISTICS table in above batch delete after each 1 000 000 rows for instance
0
 
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Author Closing Comment

by:Auerelio Vasquez
ID: 37840010
Perfect!
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