Database Backup and Recovery (MOSC)

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Change in size of RMAN backup after migraton

edited Feb 1, 2013 4:27AM in Database Backup and Recovery (MOSC) 7 commentsAnswered

Hi, any ideas on the follwoing.

I recently moved an application from

"10GR2" on AIX

to

OEL 11gr2 and ASM

using TTS to do the conversion.

This all seemed to work ok. The database application tablespaces were about 6TB in total.

When running a backup of the new database on LINUX (OEL), I noticed that the backup size on Linux was ~400GB bigger than what it was from the orginal AIX backup used to create a staging AIX database. (using output_bytes from v$rman_backup_job_details)

Any ideas why this would occur? Looking at the actual database backup files on the o/s the ones from AIX took up 708GB and on LINUX 1.1TB - that is a difference of ~400GB. If anything, the AIX database would have been slightly bigger than the LINUX database to start off with too.

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