RMAN Restore database slow/How to Improve RMAN restore performance [ID 467694.1]

RMAN Restore database slow/How to Improve RMAN restore performance [ID 467694.1]
	Modified10-jun-2010TypeHowtoStatusModerated

In this document
Goal
Solution

Platforms: 1-914cu;

This document is being delivered to you via Oracle Support's rapid visibility (RAV) process and therefore has not been subject to an independent technical review.

Applies:

Oracle Server-Enterprise Edition-version: 10.1.0.2 to 10.2.0.4-release: 10.1 to 10.2
Information in this document applies to any platform.

Goal

RMAN Restore database is slow. Backup to tape takes 13 hours and the restore takes over 26hrs.

Solution

Things to check/configure when RMAN restore from tape is slow:

+ The number of channels to be allocated shoshould be equal to the number of physical tape drives.

+ Set parallelmediarestore off and run the restore:

Example:
RMAN> set parallelmediarestore off;
RMAN> run {
Allocate channel to tape...
.
.
Restore database;
Recover database;
}

+ If large pool is not configured then configure the large pool size and enable the backup_tape_io_slaves:
Large_pool_size = 100 m
Backup_tape_io_slaves = true

By setting the above parameters the restore time when CED from 26 hours to 13 hours.

 

 

 

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