Database Backup and Recovery (MOSC)

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Optimize Incremental Backups

in Database Backup and Recovery (MOSC) 5 comments

Hi,

sometimes we observe a high disk latency on SAN LUNs for DBs during incremental level 1 backups. This is because many diskreads on DB blocks are needed to determine wich blocks are changed and should backed up.

Of course, I can enable block change tracking (BCT) to speed up incremental backups. But before doing this. Why should I make an incremental backup at all? We backup two times a day the archivelogs and one time in a week we make a level 0 (full) backup.

Is this because the restore time would be much longer when I have only full- and archive log backups available. Hence, the time to apply incremental backups should be faster than applying archivelog backups? Maybe archivelog backups contains only redodata and incremental backups contains changed blocks.

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