iRant - Latest Comments in Load Balancing Two MySQL Servers for PHP Applications

Re: Load Balancing Two MySQL Servers for PHP Applications

tieh — Sun, 21 Jun 2009 10:32:22 -0000

Thanks for posting the code. It's really helpful although this was posted 2 years ago.

Re: Load Balancing Two MySQL Servers for PHP Applications

Chris — Sat, 18 Apr 2009 02:05:16 -0000

For anyone trying this.. don't forget
$stream = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

Put that above the socket_bind...

Re: Load Balancing Two MySQL Servers for PHP Applications

fgh — Tue, 22 Jul 2008 01:08:57 -0000

hfgh

Re: Load Balancing Two MySQL Servers for PHP Applications

Sat, 21 Jun 2008 21:58:03 -0000

Re: Load Balancing Two MySQL Servers for PHP Applications

Php Database Script — Mon, 02 Jun 2008 03:49:40 -0000

I found your site on faves.com bookmarking site.. I like it ..gave it a fave for you..ill be checking back later

Re: Load Balancing Two MySQL Servers for PHP Applications

jploh — Thu, 31 Jan 2008 04:15:28 -0000

You're lucky I still have the PDF file stored somewhere. Here it is:
http://rapidshare.com/files/88019396/03-11.pdf....

Re: Load Balancing Two MySQL Servers for PHP Applications

sam — Wed, 30 Jan 2008 20:19:58 -0000

http://davh.dk/projects/mysql-load-balance/

this link is not working.can you provide me any other link which has more information about algorithm.

Re: Load Balancing Two MySQL Servers for PHP Applications

jploh — Wed, 20 Jun 2007 16:29:01 -0000

The link I gave in my last comment is for clustering. But the one used in my post is replication.

I also extended my daemon script that's running in production. I just wanted to give a basic idea of how it works.

For performance, refer to the image below. The one in blue was when it wasn't rotating between servers. The one in red, when rotation was in effect.

<img src="http://img458.imageshack.us/img458/4946/jppniccmysqlqueriesweekyi4.png" alt="QPS before/after"></img>

Re: Load Balancing Two MySQL Servers for PHP Applications

fred — Wed, 20 Jun 2007 12:42:05 -0000

Hi, i wanna know how much about performance do you get with this trick?

Re: Load Balancing Two MySQL Servers for PHP Applications

Marcus — Wed, 20 Jun 2007 11:55:26 -0000

There is a difference between MySQL Cluster and MySQL replication. What you seem to be describing is replication, in which case I don't think that the linked article will help you.

It seems to me that your approach should work out just fine. Just don't try to get into master-master replication... it's a pain and it can only lead to tears. :)

If you want to make it more robust, you could add a couple of features to your daemon. For example, you should pull your config information from a file. Then you could implement a simple protocol. For example, the client could send "REQ" to request a DB handle. Or the client to send "RELOAD" to cause the daemon to reload it's config file. This way you wouldn't have to stop the daemon...

Then again, PHP probably isn't the best language to use for the daemon, since it will block on each request. If you have two requests coming in at the same time, the second one will have to wait for the first to get done. This might be an issue over time.

Re: Load Balancing Two MySQL Servers for PHP Applications

jploh — Tue, 19 Jun 2007 08:11:41 -0000

It's possible to have a cluster with two servers. You'll initially need three servers then you can turn off the third one once it's running (not recommended). See this article.

Re: Load Balancing Two MySQL Servers for PHP Applications

Andrew Blake — Tue, 19 Jun 2007 07:56:11 -0000

"I found out that a MySQL cluster needs to have at least three servers to get full redundancy."

I'm thinking of implementing cluster over two servers - could you tell me about the issues you found that make it require three machines ?

Thanks

Andy