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Oracle backup size differs between 2 almost identical database

in Database Backup and Recovery (MOSC) 4 commentsAnswered

I'm troubleshooting a weird issue on 2 of our dev database. This 2 database is almost identical in size, both are identical in the version of Oracle & both are backed up using exactly the same backup script.

Oracle version : 19.18.0.0.0

Both database is about 6TB of size & number of data files are identical because they're a clone of each other. However the full backup size between the 2 varies by a lot which I need some help to check why.

DB_1 backup size is about 900GB

DB_2 backup size is about 1.5TB

I've check the RMAN parameters for both database, they're identical as well & there's no abnormal archive generation on DB_2. Both databases are backed up using lv0 backup once a week & a daily archive log backups.

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