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Issue:Mirroring Sync in Asynchronous Mode


Issue:Mirroring Sync in Asynchronous Mode

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Robert Davis
Robert Davis
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houming1982 (4/12/2013)
If data loss happened when failed over to the mirror server, and there were lots of transactions happened on the mirror server during the downtime of principal server, HOW TO FAILOVER back to the principal server on keeping Consistency of data?


If a fail over is issued either manual or automatic, there is no chance for data loss. Data loss will not occur. Data loss is only possible when you use FORCE_SERVICE_ALLOW_DATA_LOSS to force the mirror to come online. When the mirroring session is resumed after forcing service, and data that was on the principal and not yet synched to the mirror at time of failure will be lost and the new mirror (original principal) will be synched with the new principal.



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Neeraj Dwivedi
Neeraj Dwivedi
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I agree with Robert Davis, once mirroring is suspended, it is not started automatically, you have to issue "ALTER DATABASE DBName SET PARTNER RESUME", then only the mirroring will start again.
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