How to re-sync the master MySQL DB with Slave DB changes if master goes offline?

Question

4.00/5 (1 vote)

See more:

Mysql Server 1 is running as master. Mysql Server 2 is running as slave.

So with both DBs online, they are in "perfect sync". If slave goes offline there's no problem if master still online - they sync once slave becomes online.

Beside the server configuration, I redirected the connection (with JSP code) for the slave DB if the master goes offline (I tested of course with /etc/init.d/mysqld stop).

When the master goes back online, there's any automatic method to sync the master with slave updates?

Posted 14-May-11 12:08pm

Maxdd 7

Updated 15-May-11 6:17am

v4

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Kim Togo · Accepted Answer · 2011-05-14T22:19:00

What you what, is not how master-slave works. Master can only replicate to any number of slaves. But salves cannot update master. That is the idea in "master-slave".

What you are asking is called MySQL Cluster, it is a synchronous solution that enables multiple MySQL instances to share database information. Unlike replication (master-slave), data in a cluster can be read from or written to any node within the cluster, and information is distributed to the other nodes.

Try read this good link from MySql - High Availability and Scalability[^]

---------------
There is a program called MySql Proxy[^], that act as man-in-the-middle. One endpoint and many MySql servers.

But the point in master-slave, I think, is that you do SELECT query's on the slaves and updates/delete on the master. This way you off-load the master.