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What are some of the good options to sync two or more MySQL databases of the same schema, situated at different locations; reliably?

We have four database in four different locations.

we tried using the generic master master replication but the link breaks again and again leading to inconsistencies.

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    Not a MySQL expert, but you'll want to include more info here for others: MySQL Version, where are the different locations, do you need master-master functionality or is read-only secondary fine, what type of load does your system have, hosted in the cloud or internally, etc. - these are all important factors – LowlyDBA Sep 12 '16 at 14:52
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There are many things that can go wrong in Master-Master. Use Master-Master, but do not write to both masters. Pick one for all writes; leave the other one for failover.

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