Re: Problems with system locking
Hi Brian,
Brian O'Donnell wrote:
...
> I guess MySQL will go and examine all the
> underlying tables for each query?
>
> We were thinking that if we set the MERGE table to
> use the first table
...
> However I'm not sure this will
> make any difference as it probably has to go to
> the other tables to ensure the data isn't in them
> - unless it builds a separate index?
MERGE cannot make any assumptions about the contents of the tables. It has to scan all indexes.
But you can create multiple MERGE tables. Create one for the last two tables, one for the last three, and so on, whatever you need.
Regards
Ingo Strüwing, Senior Software Developer - Storage Engines
MySQL AB, www.mysql.com
Subject
Views
Written By
Posted
9446
April 26, 2006 05:37AM
9945
April 27, 2006 04:36AM
3921
April 27, 2006 07:41AM
3345
May 02, 2006 06:13AM
3359
May 02, 2006 07:49AM
3000
May 02, 2006 10:46AM
2780
May 12, 2006 04:10AM
Re: Problems with system locking
2909
May 15, 2006 02:57AM
2991
April 28, 2006 03:23AM
2674
May 02, 2006 06:27AM
4123
June 13, 2006 09:59PM
2725
June 14, 2006 08:04AM
2999
June 14, 2006 10:22AM
2779
June 15, 2006 09:26AM
3232
June 15, 2006 11:18AM
3030
June 16, 2006 03:18AM
3120
July 14, 2006 03:52PM
2999
July 31, 2006 04:16AM
2971
August 22, 2006 11:34AM
2962
July 19, 2006 04:07AM
Sorry, you can't reply to this topic. It has been closed.
Content reproduced on this site is the property of the respective copyright holders.
It is not reviewed in advance by Oracle and does not necessarily represent the opinion
of Oracle or any other party.