Re: [PHP-DEV] Sessio variables and Load Balancing From: Chris Adams (chris <email protected>)
Date: 06/30/00

> How do we all know that NFS is unreliable under Linux? Why is it
> unreliable and were do I find documentation to support this? I've heard
> people say this, but never with any information to back that up.. seems
> more of a "feeling".

Search around if you want to see reports of unreliability and performance
problems with NFS. There've been a couple Ask Slashdots about it, with the
general conclusion that recent kernels are much better than the old ones.

> It might be an *easier*solution to use the database to store sessions, but
> if you have thousands of visitors per day.. you will begin to drag your
> database server to the pits of hell with the number of queries you will be
> making just to retrieve session data, not counting the queries you would
> already be making to serve various dynamic content. Not recommended for a

If you're using MySQL or a well-tuned Oracle install, this won't be a big
deal at all. Retrieving a record on an indexed column is extremely fast. If
the single query necessary to retrieve a session's data measurably affects
your site performance, your database is either severely underspeced or your
DBA should be fired for gross incompetence. 

-- 
PHP Development Mailing List <http://www.php.net/>
To unsubscribe, e-mail: php-dev-unsubscribe <email protected>
For additional commands, e-mail: php-dev-help <email protected>
To contact the list administrators, e-mail: php-list-admin <email protected>