mysql - data replication and master -

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i have web based system in php works locally in multiple places , in each place has local database in mysqli.

also system in every place connect remotely database of information specific tables of local systems example when insert record in place,this record insert remote database ,too. , on ,to tell summary sync information local remote database.

schema of system

now know replication can idea this.

but don't know when remote database has problem , system can't connected remote database how apply changes in local database remote database?


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