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RMAN Scheduling Question

Posted on 2010-11-30
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Last Modified: 2012-05-10
Hi Experts,

I am a newbie in RMAN backups, so would need some guidance for the scheduling of Full/Incremental backups.We have couple of instances (different machines) which needs backup.My concern is that i don't have a tape device and my backup destination as of now is a SAN storage with size of 700GB( This is enough to store 8-9 days of backup).For now i was planning to do following scheduling

Sun: Incr Level 0 backup
Mon - Sat: Incr Level 1 backup

SETTINGS
CONFIGURE DEFAULT DEVICE TYPE TO DISK;
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO COMPRESSED BACKUPSET;
CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT '\\nyx\sesto01sql06\ora_df%t_s%s_s%p';
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '\\nyx\sesto01sql06\%F';
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS;
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE BACKUP OPTIMIZATION ON;

INCR LEVEL 0 BACKUP
BACKUP INCREMENTAL LEVEL 0  DATABASE FILESPERSET 15;
NOT BACKED UP SINCE TIME 'SYSDATE-1'
BACKUP ARCHIVELOG ALL;
DELETE ARCHIVELOG UNTIL TIME 'SYSDATE-2';

INCR LEVEL 1BACKUP
DELETE BACKUP COMPLETED BEFORE 'SYSDATE-7' DEVICE TYPE DISK;
BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DEVICE TYPE DISK DATABASE FILESPERSET 15;
NOT BACKED UP SINCE TIME 'SYSDATE -1 ';
BACKUP BACKUPSET ALL; # copies backups from disk to tape
BACKUP ARCHIVELOG ALL;
DELETE ARCHIVELOG UNTIL TIME 'SYSDATE-2';

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For the above scenario i am planning to move the Level 0 backup to seperate place until new Level 0 is created.Is it correct or do i need to keep all the Level 0 or just the last Level 0 backup + recent Level 1 cumulative backup is enough to restore the DB?

Also will the "DELETE BACKUP COMPLETED BEFORE 'SYSDATE-7' DEVICE TYPE DISK" command in the Level 1 backup script delete my Level 0 backup

Kindly revert if you guys have any feedback.

Thx







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Question by:AndersBiro
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sridharv9 earned 1500 total points
ID: 34240894
last/latest level 0 full + recent level 1 cumulative backup should be enough. Just make sure to run CROSSCHECK to Update the RMAN Repository.
For more info read http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/maint002.htm
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Author Closing Comment

by:AndersBiro
ID: 34245007
A bit more detail appreciated
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Author Comment

by:AndersBiro
ID: 34245021
Hi Sridhar,

Thanks for the valuable comments.May i know if the "DELETE BACKUP COMPLETED BEFORE 'SYSDATE-7' DEVICE TYPE DISK" command in the Level 1 backup script  will delete my Level 0 backup also ?
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LVL 6

Expert Comment

by:sridharv9
ID: 34245053
You may call  this command from any script from RMAN perspective it is same. So it will delete all SYSDATE-7 backups including level 0 and level 1 fall with the date.
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Author Comment

by:AndersBiro
ID: 34245143
Thanks for the info.So can i conclude that to be on safe side after Level 0 backup file is completed, make a copy of it somewhere else ( may b in other disk since we don't have a tape device) and then let the DELETE statement remove it.With this scheduling in the case of DB crash before Level 0 completion i can restore the Level 0 from the other disk and along with latest Level 1 cumulative backup, can proceed with restoration ? For the above scenario is "CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS" fine ?

Thanks,
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LVL 6

Expert Comment

by:sridharv9
ID: 34253233
yes, you got it right. BTW you can always catalog back the old backups if needed for restore or recovery. For more info read http://arjudba.blogspot.com/2008/09/how-to-catalog-and-uncatalog-backup-to.html
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