Is a Temporary Table Really Necessary?

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Is a Temporary Table Really Necessary?

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ramoha SSCommitted Points: 1909 More actions · Answer 1

Hi Randy,

Thanks for the article. We also had similar issues joining two three tables with over 200 Million rows with WHERE condition, the O/P was dying if we used derived tables or JOINS. But once we started using #temp tables pre-populated with where conditions the queries executed in seconds.

I think execution manager in SQL Server 2005 in not efficiently managing the worker tables or derived tables when the dataset is huge.

Regards,

Razi, M.
http://questivity.com/it-training.html

Steve Jones - SSC Editor SSC Guru Points: 734416 More actions · Answer 2

SQL Server 2005 handles most code better, but not all.

If you are having performance issues, I suggest you post a more details explanation in the SQL Server 2005 Performance Tuning Forum.

alex-746374 SSC Eights! Points: 922 More actions · Answer 3

> I am not fond of cursors and advocate doing anything possible to replace the cursor

What do you gain by handling the looping yourself rather than just using a cursor? I try and get rid of cursors by replacing with a single sql statement. Obviously this won't work if you have to call a stored procedure for every record in a table (for example), but if you have to do this then why is using your own looping mechanism preferable to using a cursor?

Jeff Moden SSC Guru Points: 1003851 More actions · Answer 4

alex (5/15/2009)
> I am not fond of cursors and advocate doing anything possible to replace the cursor
What do you gain by handling the looping yourself rather than just using a cursor? I try and get rid of cursors by replacing with a single sql statement. Obviously this won't work if you have to call a stored procedure for every record in a table (for example), but if you have to do this then why is using your own looping mechanism preferable to using a cursor?

I agree... a good "firehose" cursor makes sense here.

--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.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
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