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-Original Message-
From: phark...@gmail.com [mailto:phark...@gmail.com] On Behalf Of Perrin Harkins
Sent: Friday, January 15, 2010 6:08 AM
To: Johan Machielse
Cc: Baron Schwartz; mysql@lists.mysql.com
Subject: Re: When using "FOR UPDATE" whole the table seems to lo
On Fri, Jan 15, 2010 at 2:54 AM, Johan Machielse
wrote:
> The problem is that multiple users can read and update the same field
> simultaneously (worse case) which could lead to unpredictable problems.
There are other ways to do handle most cases. For example:
UPDATE table SET value = value + 1
such a problem?
Thank you in advance.
Regards,
Johan Machielse
- Original Message -
From: "Baron Schwartz"
To: "Johan Machielse"
Cc:
Sent: Friday, January 15, 2010 3:14 AM
Subject: Re: When using "FOR UPDATE" whole the table seems to lock instead
of s
Johan,
I don't see a valid need for using FOR UPDATE here. In fact, FOR
UPDATE is the cause of many grievances, and I would advise you to
avoid it by any means possible. Among other things, it will cause
serious performance problems when your server gets busy. And as you
can see, it's hard to f
