can someone explain to me of retention of Rman and optimization policy on or off.

1. What is the meaning of retention policy redendency 1 or 2?

2 what is the meaning of the retention policy to retrieve the window?

3. What is the meaning of optimization and what happens in this case and vice versa?

4. If optimization is he going to consider read-only and offline table space?

5. If optimization off is going to be considered read-only and offline table space?

do not post any documents that I went through the box of documents that someone let me know in words simple or easy to understand for me... give me some examples of real time

Thank you for your time and patience.   waiting for your answers...

Thanks and greetings

Pichon

Hi Abhishek,

(1) If you set the retention to redundancy 2 policy, RMAN will keep only two recent backup copies and it will mark the rest obsolete backup copies (which means no need for recovery)

(2) If you set the retention policy to retrieve the window at 5 days, no matter how much you take, backups RMAN will keep the last backup of 5 days. And the backups before the last 5 days will be marked as obsolete. So that the two retention policies are different, which serve different purposes. We use according to our requirement.

(3) optimization means determine the most effective way to carry out the instructions. When you turn on the backup optimization, all orders backup will skip backups of any file if it has not changed and she has already been saved on the allocated device type.  A file can be any file dbf, archived redo log or a RMAN "backup set". If you turn off your backup optimization, all files are backup no question that has already been taken.

(4) if backup optimization is configured, RMAN ignores backups of data files offline and read-only if the most recent backups were made the or after the closest point in the recovery window

(5) if backup optimization is not configured, RMAN will have all the backups, including read-only and offline tablespaces.

Hope this helps!

Kind regards

Pradeep. V

Tags: Database

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