Comments on: SQL Server T-SQL Tuning – Temp Tables, Table Variables and Union

By: Shehap El-Nagar

Shehap El-Nagar — Fri, 12 Apr 2013 10:50:03 +0000

Yes ,it is better to create clustered indexes on #TempDB table before insert to avoid any heap table case and thus avoid any table scan but you can defer creating non clustered indexes after insertion to avoid any additional IO cost for clustered indexes that can impact negatively on DML performance and this is an ultimate abstract should be considered largely for DBs having intensive OLTP transactions (DML transactions)

Let me know if any further help is needed

By: Mark Freeman

Mark Freeman — Thu, 11 Apr 2013 14:43:07 +0000

Is it better for performance to create the indexes on a #temp table before or after populating the table using an INSERT?

Of course, creating the indexes first is not an option if you create the temp table using a CTAS (Create Table as Select) statement.

By: Mhady

Mhady — Sun, 07 Apr 2013 08:22:12 +0000

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By: Hany

Hany — Mon, 18 Mar 2013 07:20:06 +0000

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By: DBA

DBA — Sun, 17 Mar 2013 04:48:06 +0000

Quite useful!

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Anas — Sun, 10 Mar 2013 07:13:07 +0000

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By: Eric

Eric — Sat, 23 Feb 2013 07:48:11 +0000

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By: Rizky

Rizky — Wed, 13 Feb 2013 05:51:59 +0000

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By: Rizky

Rizky — Wed, 23 Jan 2013 07:10:15 +0000

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