Hi, 1. Can you able to find RMAN.DF_P constraints details from catalog db 2. Secondly, check/once again try why that record is failing, if it's too old record in catalog table, you may delete that record from catalog table/segment and re-try - ThanksPavan kumar N From: Rich <richa03@xxxxxxxxx> To: Oracle-L Freelists <oracle-l@xxxxxxxxxxxxx> Sent: Wednesday, 4 March 2015 9:18 PM Subject: RMAN fails with ORA-00001: unique constraint (RMAN.DF_P) violated Hi List, This is 11.1.0.7 on RHEL 5.1 (external application requirements). I don't know if this is related, however, this started with only incremental backups failing with: ORA-19643: datafile 6: incremental-start SCN is too recent ORA-19640: datafile checkpoint is SCN 656412919 time 02/27/2015 06:46:55 (sometimes datafile 83 and different SCN numbers) Fulls were OK until just recently; they now fail with: ORA-00001: unique constraint (RMAN.DF_P) violated No changes to backup scripts which are fairly standard - the logfile and error stack (for a full) is: RMAN> run { 2> show all; 3> backup incremental level = 0 database plus archivelog delete input tag Full_DB_20150304_062126 ; 4> delete noprompt force obsolete ; 5> } starting full resync of recovery catalog RMAN-00571: =========================================================== RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== RMAN-00571: =========================================================== RMAN-03002: failure of show command at 03/04/2015 06:21:31 RMAN-03014: implicit resync of recovery catalog failed RMAN-03009: failure of full resync command on default channel at 03/04/2015 06:21:31 ORA-00001: unique constraint (RMAN.DF_P) violated Google and MOS have been little to no help...did find Bug 9288598, however, this is not a standby and I don't think it ever was. Support is also "working" on this, however, not much there either (just sent them log files and a debug). We do see that these datafiles (6 & 83) as well as some others have UNRECOVERABLE_CHANGE# populated and UNRECOVERABLE_TIME with a date back in 2013. This looks to me like there was some NOLOGGING activity back then, but I don't think this should be an issue? Any ideas? Thanks, Rich