This isn't a constraint, this is a limit, the goal is to have a bi-directional replication but I've not found solutions to my problem using mysql. I've a control access system with 9 minitowers which controls people access via RFID, each minitower is provided with linux and mysql synchronized with a main server, each machine is identical to others and can alive without connecting to main server if any problem hardware or software close the connection with the rest of the network and align again datas if connection go up, something like a survivor system. So now you can understand that with this scenario mysql actual replication MASTER/SLAVE isn't a solution. (Perhaps I'll think to modify sources :)) )
The only constraint you'll have here is that there can only be one MASTER
that has to accept all the INSERT/UPDATE/DELETE (or anything that will
make the data change).  All other nodes would be considered SLAVEs and
be READ-ONLY.

Hope this helps.

a



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