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 SQL 2008 DROP Index Overhead?
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Posted - 01/10/2011 :  17:07:16  Show Profile  Reply with Quote
Should I expect there to be any large overhead with actually running a drop index statement? I'm just planning ahead before I run it but want to make sure it won't affect any users when I'm running it. The indexes I will be removing are no longer used and exist on a very large table (187 million rows).

Almighty SQL Goddess

38200 Posts

Posted - 01/10/2011 :  17:10:35  Show Profile  Visit tkizer's Homepage  Reply with Quote
Are you running Enterprise edition? If so, then you can use ONLINE=ON option.

Otherwise, blocking is going to occur. ONLINE=OFF is the default. Here is what BOL says about offline mode:


Table locks are applied and the table is unavailable for the duration of the index operation.

See DROP INDEX in BOL for more details.

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server

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