Error while running commands at RMAN prompt

Question

Hi ,
We have a few oracle 10g(10.2.0.3) databases on AIX platform.We use RMAN backup with a recovery catalog database.
The rman full(level 0)backups are scheduled dailly and running fine.When I tried to run commands like 'list backup','report obsolete' I'm getting the following errors.
connected to target database: TICSPROD (DBID=2626621498)
connected to recovery catalog database
RMAN> report obsolete;
RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 3
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of report command at 08/04/2011 07:49:36
RMAN-06004: ORACLE error from recovery catalog database: ORA-03113: end-of-file on communication channel
ORACLE error from recovery catalog database: ORA-03114: not connected to ORACLE
RMAN> list backup;
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of list command at 08/04/2011 07:56:25
RMAN-06004: ORACLE error from recovery catalog database: ORA-03113: end-of-file on communication channel
ORACLE error from recovery catalog database: ORA-03114: not connected to ORACLE
But the recovery catalog database is up and running fine.For few other databases I'm able to run the above commands without errors and for some databases I'm getting the errors as mentioned above.
Could someone help me out with this...

Answer 1

Thanks Tycho for your reply.
Please find the output of the query in recovery catalog.
SQL> select * from v$resource_limit;
RESOURCE_NAME CURRENT_UTILIZATION MAX_UTILIZATION INITIAL_AL LIMIT_VALU
processes 49 83 5000 5000
sessions 30 63 5505 5505
enqueue_locks 27 94 65910 65910
enqueue_resources 27 73 24440 UNLIMITED
ges_procs 0 0 0 0
ges_ress 0 0 0 UNLIMITED
ges_locks 0 0 0 UNLIMITED
ges_cache_ress 0 0 0 UNLIMITED
ges_reg_msgs 0 0 0 UNLIMITED
ges_big_msgs 0 0 0 UNLIMITED
ges_rsv_msgs 0 0 0 0
gcs_resources 0 0 0 0
gcs_shadows 0 0 0 0
dml_locks 0 76 24220 UNLIMITED
temporary_table_locks 0 3 UNLIMITED UNLIMITED
transactions 1 10 6055 UNLIMITED
branches 0 0 6055 UNLIMITED
cmtcallbk 0 1 6055 UNLIMITED
sort_segment_locks 0 5 UNLIMITED UNLIMITED
max_rollback_segments 11 11 6055 65535
max_shared_servers 20 20 800 800
parallel_max_servers 0 32 320 3600
22 rows selected.
The alert log of the catalog database is continously getting refreshed with the following message.
Incremental checkpoint up to RBA [0x3b3.a780.0], current log tail at RBA [0x3b3.a78f.0]
Mon Aug 8 00:16:17 2011
Incremental checkpoint up to RBA [0x3b3.abf8.0], current log tail at RBA [0x3b3.ac4f.0]
Mon Aug 8 00:46:19 2011
Incremental checkpoint up to RBA [0x3b3.1451b.0], current log tail at RBA [0x3b3.1451b.0]
Mon Aug 8 01:16:21 2011
Incremental checkpoint up to RBA [0x3b3.14b15.0], current log tail at RBA [0x3b3.14baa.0]
Mon Aug 8 01:46:23 2011
Incremental checkpoint up to RBA [0x3b3.14be1.0], current log tail at RBA [0x3b3.14bf0.0]
Mon Aug 8 02:16:25 2011
Incremental checkpoint up to RBA [0x3b3.15069.0], current log tail at RBA [0x3b3.150a9.0]
Mon Aug 8 02:46:27 2011
Incremental checkpoint up to RBA [0x3b3.150ed.0], current log tail at RBA [0x3b3.150ed.0]
What could be the potential cause of the issue I'm facing .Could you please guide me...