RMAN Restore Database Slow / How To Improve RMAN Restore Performance [ID 467694.1] | ||
| Modified 10-JUN-2010 Type HOWTO Status MODERATED |
|
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 to:
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 should 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 reduced from 26 hours to 13 hours.
