About RMAN backup !!!!

Question

Dear Friends,
Let my production server running starts from 1st June .
In 15 june , I take the First rman full (or level0) backup using the command :
RMAN> backup database plus archivelog;
In 20 June I take 2nd rman full backup using : RMAN> backup database plus archivelog;
Again in 30 June , I take the Third(3rd) rman full (or level 0) backup using the command :
RMAN> backup database plus archivelog;
And also my rman policy set as :
CONFIGURE RETENTION POLICY TO REDUNDANCY 1;
In the above scenario , I have the following questions :
1) When I take the Third(3rd) backup then is it the First RMAN backup goes to obsolete as per my rman policy ( RETENTION POLICY TO REDUNDANCY 1) ?
2) Is the above all RMAN backup make a link between them ?
3) If my first RMAN backup goes to obsolete and I have to delete the First RMAN backup , then which types of problem I face ? Can I go to previous state(suppose I need to back in 1st June) of my server if I delete First rman backup ?
4) when I take 3rd rman full backup , then is it all information from 1st january of the server are stored in the 3rd backup ? i.e., is the 3rd rman backup stores all the previous two rman backups information ?so that If I delete the previous two backup , then I get all information form 3rd rman backup .what is the actual scenario ......
plz help me to make clear concept about it .......
thx in advance .....

Answer 1

1) When I take the Third(3rd) backup then is it the First RMAN backup goes to obsolete as per my rman policy ( RETENTION POLICY TO REDUNDANCY 1) ?The REDUNDANCY parameter of the CONFIGURE RETENTION POLICY command specifies how many backups of each datafile and control file that RMAN should keep. In other words, if the number of backups for a specific datafile or control file exceeds the REDUNDANCY setting, then RMAN considers the extra backups as obsolete.So as in your case the redundancy is 1 so the 1st and 2nd backup are obsolete.
To check the obsolete backups run
rman> report obsolete;
To delete them
rman> delete obsolete;
Link:[http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/setup005.htm#BRBSC400]
Is the above all RMAN backup make a link between them ?I am not very much clear with the question.The RMAN information is stored in the controlfile.You can also create a new recovery catalog and register the target database. The RMAN repository records in the control file will be copied to the new recovery catalog.
when I take 3rd rman full backup , then is it all information from 1st january of the server are stored in the 3rd backup ? i.e., is the 3rd rman backup stores all the previous two rman backups information ?so that If I delete the previous two backup , then I get all information form 3rd rman backupThe 3rd RMAN backup will contain all the information of the DB from the very 1st day.You will get all the information in the 3rd rman backup as its a level 0 or what we say a FULL DATABASE BACKUP.If suppose the 3rd rman backup would have been a incremental backup, then you would have required a full backup, previous to the incremental one, so that after restoring the full backup, you restore the incremental to recover the DB completely.
Link:[http://download.oracle.com/docs/cd/B19306_01/backup.102/b14191/part1.htm#i996723]
[http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/bkup004.htm#BRBSC133]
Forgot to answer the 3rd question
3) If my first RMAN backup goes to obsolete and I have to delete the First RMAN backup , then which types of problem I face ? Can I go to previous state(suppose I need to back in 1st June) of my server if I delete First rman backup ?well, i am not very much sure , but i think is , if you have the 1st rman backup pieces physically present on the disk, you can catalog it and then use the rman command to restore the data from it of till 1st june.
To catalog the backup pieces use
rman> catalog backuppiece 'filename';
Link: [http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/maint007.htm]
HTH
Anand
Edited by: Anand... on Oct 15, 2008 10:51 AM