How distributed transactions work in SQL Server?

1.	How distributed transactions work in SQL Server?
Answer» When you find that the last full backup is corrupted or otherwise unrestorable, making all DIFFERENTIALS after that POINT useless. You then need to go back a further week to the previous full backup (taken 13 days AGO) and restore that, plus the differential from 8 days ago, and the subsequent 8 days of transaction logs (assuming none of those ended up corrupted!). If you’re taking daily full backups, a corrupted full backup only introduces an ADDITIONAL 24 hours of logs to restore. Alternatively, a LOG shipped copy of the database could save your bacon (you have a warm standby, and you know the log backups are definitely good).

Answer»

When you find that the last full backup is corrupted or otherwise unrestorable, making all DIFFERENTIALS after that POINT useless. You then need to go back a further week to the previous full backup (taken 13 days AGO) and restore that, plus the differential from 8 days ago, and the subsequent 8 days of transaction logs (assuming none of those ended up corrupted!).

If you’re taking daily full backups, a corrupted full backup only introduces an ADDITIONAL 24 hours of logs to restore.

Alternatively, a LOG shipped copy of the database could save your bacon (you have a warm standby, and you know the log backups are definitely good).

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