Whats the difference ( RMAN BACKUP)

Please let me know the diffrence between
1.Alter database begin backup
2. backup database
After my own research all i can find is that Alter database begin backup freeeze the SCN and then we can copy the files from OS level
Where backup database directly create backup set ( backup piece) ..
I would like to know the functional differnce between the two if there is any...
Plus ...doing alter database begin backup ...am i not taking care of logical corruption..
Does alter database being backup does not validate or find out the logical corruption before...
I also came know from a OCA that it just puts in backup mode and dont really pay attention to checking or validating the files...before backin up.
Is that true?
Thanks in advance
Max
Edited by: Sunny-ORACLE on Aug 18, 2009 4:59 AM

Sunny-ORACLE wrote:
Please let me know the diffrence between
1.Alter database begin backup
2. backup database
After my own research all i can find is that Alter database begin backup freeeze the SCN and then we can copy the files from OS level
Where backup database directly create backup set ( backup piece) ..
I would the functional differnce between the two if there is any...The backup database doesn't need to freeze any headers as RMAN knows how to read the datafiles of oracle. Its knows them very well. So there is nothing we need in the case of rman to check that when the backup was done.
Plus ...doing alter database begin backup ...am i not taking care of logical corruption..
Does alter database being backup does not validate or find out the logical corruption before...
I came know from a OCA that it just puts in backup mode and dont really pay attention to checking or validating the files...before backin up.
Yes its correct, the commands, alter database begin backup pr backup database doesn't check for any sort of corruptions. Fordoing that, you either need to fire up oS util. DBV for checking the physical corruptions or use RMANs Backup Validate or Backup Validate Check Logical to check for physical/logical corruptions.
HTH
Aman....

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