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Transaction log backp - 15 Mins Frequency


Transaction log backp - 15 Mins Frequency

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ArjunaReddy
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Hi ,

If i set my Txn log backup frequency for 15 mins, what is the worse data loss? Is it for 14 mins 59 Secs? (Assuming disaster happens immediately after the txn log backup is taken.

Thanks,
Nagarjun.
SQL_Bob
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I'd say the absolute worst-case for data loss would be 15 minutes, but that's assuming that the transaction log is totally destroyed and unable to be recovered, and your log backups are on a disk or tape that is not affected by the disaster.

The far more likely scenario is that you'll be able to take a tail-log backup and restore up until the point of failure, making your probable data loss considerably smaller - much closer to zero.

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bommaka.nagarjun (11/19/2012)
Hi ,

If i set my Txn log backup frequency for 15 mins, what is the worse data loss? Is it for 14 mins 59 Secs? (Assuming disaster happens immediately after the txn log backup is taken.

Thanks,
Nagarjun.


What are you defining as a disaster? The drive where the databases fails? The server fails? The building where your servers are hosted from is destroyed?

If your not shipping your backups offsite or to a device which is external from your server every 15 minutes in line with the frequency of your transaction logs, there is the possibility that you could lose everything even though you have done backups, due to the fact that your server is dead, the files live on the server and no where else or the building is destroyed and you cant get into the building to get the server to plug it in at another data centre.



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