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delete rows


delete rows

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riya_dave
riya_dave
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hi

i need to move data to another table and then remove from old one ,which i needs to delete 30 millions of rows,

i know its taking time but any idea i can do it faster like in a batch
Luis Cazares
Luis Cazares
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You should do it in several batches. If you give us the code you're using, we might be able to help more. A simple example could be this.

SELECT 1
WHILE @@ROWCOUNT > 0
BEGIN
DELETE TOP (1000000)
FROM MyTable
WHERE MyCondition = 'Delete this row'
END




Luis C.
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If you can, instead just truncate the old table, then re-insert only the kept rows.

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sampath66999
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copy the table to another table and then truncate the old table
Voide
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Before modifying data it is always a good idea to create a temp table as a backup. Once you delete it all, there's no going back.
kapil_kk
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Hi Riya, its better if you keep of your old data in some temp table and then insert the new data....
first insert the old data into a temp table then truncate old table and insert new ones into that....

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ChrisM@Work
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riya_dave (7/16/2013)
hi

i need to move data to another table and then remove from old one ,which i needs to delete 30 millions of rows,

i know its taking time but any idea i can do it faster like in a batch


After deleting 30 million rows from the old table, how many rows are left?
How similar are the two tables?

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For fast, accurate and documented assistance in answering your questions, please read this article.
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riya_dave
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total i have 60 millions rows from there i need to insert 30 millions to some another table.

once it is insert i need to delete it from original table
ChrisM@Work
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riya_dave (7/17/2013)
total i have 60 millions rows from there i need to insert 30 millions to some another table.

once it is insert i need to delete it from original table


You can do the delete/insert in the same statement like so:
   
DELETE TOP (100000) FROM LiveTable
OUTPUT deleted.* INTO ArchiveTable
WHERE ...



--batched up so it doesn't choke up your resources.

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
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