This is precisly the problem that I'm sitting with. It look like unless MySQL AB desides to build such a feature into one of the future releases this would beable to work.
Mnr Cecil J.C. Brand Computer Services/ RekenaarDienste University of the Free State/ Universiteit van die Vrystaat PO Box 339 Bloemfontein 9300 South Africa Tel :401 2940 Email :[EMAIL PROTECTED] >>> Simon Garner <[EMAIL PROTECTED]> 5/26/2005 8:56:14 AM >>> On 26/05/2005 6:40 p.m., Cecil Brand wrote: > Hi, > > I was wandering if anyone know of a stable and reliabile way to sync 2 > live mysql databases, both ways. > I know I can use a master and slave, and yes have setup a few without > any problem, but as all > of us know this is just a one way downstream sync. I need to sync both > ways and basicly live, the every > 5 or 10 min cronjob sync with a perl/php/c++ app just won't cut it. > Unfortunately, the simple answer is you can't. While it is possible to set up multi-master replication with MySQL, this is not useful for the vast majority of applications. If you are sending write queries to both masters then you have the possibility of the two servers becoming out of sync. This is particularly true with auto_increment primary keys - if you have a table and you send one insert statement to each server, both at the same time, then they might both assign the same auto_increment number to each row, and then they will both be forced to ignore the replicated inserts they receive from each other - screwing your table. Your options are to use MySQL Cluster (not an option for a lot of people as your entire database has to be stored in RAM), or if you're just after high availability, set up one-way replication with dynamic master failover (which I am currently trying to figure out how to do myself). -Simon -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] _____________________________________________________________________ University of the Free State: This message and its contents are subject to a disclaimer. Please refer to http://www.uovs.ac.za/disclaimer for full details. Universiteit van die Vrystaat: Hierdie boodskap en sy inhoud is aan 'n vrywaringsklousule onderhewig. Volledige besonderhede is by http://www.uovs.ac.za/vrywaring beskikbaar. _____________________________________________________________________
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