Re: drupal.org MySQL database issues

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От Lukas Kahwe Smith
Тема Re: drupal.org MySQL database issues
Дата
Msg-id 464AD39E.2040402@pooteeweet.org
обсуждение исходный текст
Ответ на drupal.org MySQL database issues  (John DeSoi <desoi@pgedit.com>)
Ответы Re: drupal.org MySQL database issues  ("Jonah H. Harris" <jonah.harris@gmail.com>)
Список pgsql-advocacy
John DeSoi wrote:
> Maybe they could be convinced to use the "other" database supported by
> Drupal :).
>
>
> http://drupal.org/node/144228
>
> What's the deal?
>
> The root of the problem that our database server is overloaded. This is
> causing table locks:
>
> Table locking is also disadvantageous under the following scenario:
> * A client issues a SELECT that takes a long time to run.
> * Another client then issues an UPDATE on the same table.
> This client waits until the SELECT is finished.
> * Another client issues another SELECT statement on the same
> table. Because UPDATE has higher priority than SELECT, this
> SELECT waits for the UPDATE to finish, and for the first
> SELECT to finish.

Also by moving from MyISAM to InnoDB, they not only get row level
locking, they also get MVCC ..

regards,
Lukas

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