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Re: Double indexes on one field
From: Martijn Tonies (m.tonies
upscene.com)
Date: Mon Oct 03 2005 - 05:29:21 CDT
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> Using PhpMyAdmin, I seldom get the warning message:
> PRIMARY and INDEX keys should not both be set for column `ID`
>
> I understand its meaning, but I was wondering to what extent having a
> field indexed AND being a primary key might slow down/speed up my
> queries.
>
> Is that gonna take twice the time if I am searching on the ID field,
> just because there are two indexes?
>
> I'd like to have a rough idea of how serioulsy I need to avoid these.
Creating a PRIMARY KEY will automatically create an index.
Why would you create a second index for that field?
With regards,
Martijn Tonies
Database Workbench - tool for InterBase, Firebird, MySQL, Oracle & MS SQL
Server
Upscene Productions
http://www.upscene.com
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