Is mysql cluster aware?: cluster, mysql, 2003, aware

Is mysql cluster aware?

Asked by: balrom

Hi,
we are developing an intranet web portal for a customer that own two servers with windows 2003 cluster edition.

If possible, we want to use iis with php and mysql.

Is mysql cluster aware?
Pay attention, i don't want to do a MySQL cluster installation, i want to install mysql on a windows 2003 cluster environment.

regards.

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Although it's not supported out of the box you still can do it if you really really need it. I've done this in several projects. For simplicity sake I'll assume you have 2 boxes.

There are several things to consider in such scenario
1- All the servers need to have the same data all the time
2- There must be a way to failover in case of a failure
3- Auto increment primary keys should be transparent. That means regardless in which box you insert, you should be able to get a consistent auto incremented PK value.

Let me start by saying this is perfectly possible, however requires careful configuration and testing.

Solving problem #1 is simple. MySQL supports two way replication, a.k.a circular replication. Two or more boxes are configured to be masters and slaves of each other.

Solving problem #3 is also simple. MySQL lets you set auto increment values for servers. This is achieved simply, Box_1 inserts 1,3,5,7,9 for consequtive inserts and Box_2 inserts 2,4,6,8,10. There's a server variable where you set the offset and increment for auto increment values.

Solving #2 is a bit complex. If your web app connects to localhost on both boxes, that in case of a failure you should be connecting to the other box. MySQL does not support this out of the box. You must either put a load balancer in front, which is the safest evasion for every consultant :) but not very practical and costly. However if you're using java, the jdbc driver at the client side can help much. There's however a new piece of software called MySQL proxy, which sits in between your client (web app) and mysql server. It's lightweight and you can easily handle connection to other MySQL servers in this lightweight software. The bad news is it's very very new and not tested much.

I suggest you read

http://www.onlamp.com/pub/a/onlamp/2006/04/20/advanced-mysql-replication.html

and

http://www.mysql.com/news-and-events/newsletter/2003-05/a0000000127.html

Hope this helps.

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Is mysql cluster aware?

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cluster

mysql

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aware

MySQL Server

Microsoft Server

PHP for Windows

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