I have several databases located in different locations and a central database which is in a data center. All have the same schema. All of them are changed(insert/update/delete) in each location with different data including the central database.
I would like to synchronise all the data in the central database. I would also like all data in the central database synchronise to all locations. What I mean is that database change in location 1 should also be reflected in location 2 database.
Any ideas on how to go about this?
Just look at SymmetricDS. It is a data replication software that supports multiple subscribers and bi-directional synchronization.
You will have to implement a two-way replication scheme between the databases. Every new record created should have a unique identifier (eg. a GUID), so that data from the different databases does not conflict. (See the mysql replication howto).
MySql only supports one-way replication, so you will need to set up each database as a master, and make each database a slave of all the other database instances. Good luck with that.
I went to SymmetricDS
I think it is the top quality also just to mention I found in sourceforge (php mysql sync)
and found many links on the internet.
Unfortunately, MySQL replication capabilities won't allow you to do exactly what you want.
Usually, to synchronize two servers the master-master replication scheme can be used. See http://www.howtoforge.com/mysql_master_master_replication
The problem is that each MySQL server can have ONLY ONE master.
The only way I know to keep several servers synchronized, would be a circular replication (see http://onlamp.com/pub/a/onlamp/2006/04/20/advanced-mysql-replication.html?page=2), but won't exactly fit your needs ("star" configuration)
Maybe this configuration could be close enough : all the "distant" (non central) databases would be only be readable slaves (synchronized though a basic master-slave replication), and writings would only occur on the central server (which would be master).
来源：https://stackoverflow.com/questions/4804972/strategy-on-synchronizing-database-from-multiple-locations-to-a-central-database