RMAN-20020: database incarnation not set

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Estaba realizando pruebas de RMAN para retornar en un punto en el tiempo por medio de arch’s.

Cuando finalizaba la ejecucion del ciclo de pruebas tomaba un backup de los archives.
Luego de ello rompia la base, hacia el restore y comenzaba el recovery hacia un determinado punto en el tiempo.

Pero cuando estaba terminando un ciclo ocurrio un problema a la hora de tomar el backup de los arch’s.

El problema traia como consecuencia , no poder tomar el backup de los archives.

$ rman target / catalog=rman@catrman

RMAN> run 
  {
   allocate channel oem_backup_disk1 type disk ;
   allocate channel oem_backup_disk2 type disk ;
   allocate channel oem_backup_disk3 type disk ;
   allocate channel oem_backup_disk4 type disk ;
 2> 3> 4> 5> } 

allocated channel: oem_backup_disk1
channel oem_backup_disk1: sid=646 devtype=DISK

allocated channel: oem_backup_disk2
channel oem_backup_disk2: sid=651 devtype=DISK

allocated channel: oem_backup_disk3
channel oem_backup_disk3: sid=654 devtype=DISK

allocated channel: oem_backup_disk4
channel oem_backup_disk4: sid=642 devtype=DISK
released channel: oem_backup_disk1
released channel: oem_backup_disk2
released channel: oem_backup_disk3
released channel: oem_backup_disk4

RMAN> backup as COMPRESSED BACKUPSET tag '$TAG' archivelog all format '/tsm/t2/t2p/diario/%T_%d_ARC_PRE_DBID%I_s%s_p%p_arc';

Starting backup at 17-MAY-11
current log archived
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup command at 05/17/2011 15:03:58
RMAN-03014: implicit resync of recovery catalog failed
RMAN-06004: ORACLE error from recovery catalog database: RMAN-20020: database incarnation not set