If I set redundancy 4 and then delete obsolete, that will delete the older backupsets. however, if I set the control_file_record_keep_time to 1000 days, shouldn't that keep 1000 days worth of backup data so I can still restore from tape? will control files really get that big? aren't they just keeping some data for rman. This can't be more than a few megabytes at most even with 1000 days worthof backups? -------------- Original message -------------- From: "Pal, Raj" <Raj.Pal@xxxxxxxxxxxx> Ryan, ?Redundancy = 4? should ensure that your controlfile retains metadata knowledge of 4 backups of the specified type. If you want to ensure that you don?t lose this info though, I would strongly recommend that you use a catalog database (just in case you lose your controlfile(s)? and should be used if your instance is mission critical). Since it doesn?t sound like you are using a catalog db, I also suggest that you use ?controlfile copy? versus controlfile backups (or in addition to at a minimum). Regardless of catalog database usage? make lots of controlfile copies on different disks? often. And? be sure that you have enough mountpoint space for your expandable controlfiles. If control_file_record_keep_time > 0, it will expand when needed. And if you?re asking your controlfiles to retain 4 backups worth of knowledge, depending on db size, backup frequency, amount of redo, etc? these controlfiles may get large. Raj. From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of ryan_gaffuri@xxxxxxxxxxx Sent: Tuesday, April 10, 2007 1:40 PM To: oracle-l@xxxxxxxxxxxxx Subject: RMAN without a repository If I am making tape backups and I am using redundancy 4. How do I restore older backups after the controlfile recycles? Or do I set control_file_record_keep_time to a sufficiently large number? do I have to write down the DBID and use that to restore an older copy?