How mirror database

@omid_student,

You can use replication which will keep the master and slave databases in sync or you can use the manual process which is every create/update/delete query is tracked and sent to multiple databases simultaneously.

Replication: https://www.toptal.com/mysql/mysql-maste...n-tutorial
Manual process is not the ideal solution but it does work if maintained.
You could also consider a cloud based database which should have the replication process built in which should be easy to turn on.

Thank you so much