What is the difference (BACKUP RMAN)

Please let me know the difference between

1 Alter database begin backup

2 backup database

Once all my own research, I can find this Alter database begin backup freeze the RCS and then we can copy the files from the operating system level

Where backup database directly create a backup set (backup piece)...

I would like to know the difference between the two functional, if there is...

More... .doing alter database begin backup... .am I not taking care of the logical corruption...

Alter database being backup not to validate or discover the logical corruption before...
I also came know from a TRAY that is just into backup mode and don't really pay attention to check or validate the files... before you screw it back upward.
Is this true?


Thanks in advance
Max

Published by: sunny-ORACLE on August 18, 2009 04:59

ALTER database begin backup is a SQL command and is required to start a backup maintained by users . Backups managed by users have special sections in the documentation of backup and restoration provided by Oracle.
After this statement, it is up to the user to copy the data, ideally by the Oracle provided o/s ocopy command files

backup database is an RMAN command to back up the database. When filesperset is greater than 1, it will be multiplex multiple datafiles in 1 backupset.
backup database may check (when you specify the clause of 'sense check') for logical corruption.
ALTER database begin backup done nothing of the kind.

That is to say: they are apples and pears.

-----------------
Sybrand Bakker
Senior Oracle DBA

Tags: Database

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