RMAN backups running slow with Catalog , Running fine using control file.

I am facing a weird scenario
RMAN backups are running fine with Control file but are failing using Catalog
There are other databases configured on the same catalog and they are running fine leaves us to suspect this is issue with Database.
Can you please suggest what need to be checked in such scenario
DB: 11.2.0.2
OS: Aix 6.1
Catalog : 11.2.0.2

Hi,
Basically its not only with backups, simple list incarnation also taking a lot of timeDo sql tracing on your catalog session and target db session while running the 'list incarnation' command for your problem dbs and a normal dbs.
Regards,
Tycho

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I encountered a problem using RMAN with TSM to backup a database. It seems that the RMAN channel doesn't use the entire bandwidth to the TSM (or whatever) and is idle most of the time. This makes the database backup really slow.
As a comparison, we backup also filesystem and SQL Server, they both use very few channels and each channel backup about X5 more data per second than Oracle. For example, SQL Server uses 5 channels to the TSM, and we get a total of around 100MB/s. When we configure Oracle to backup using 5 channels we get about 20MB/s and we see that the SQL Server is writing to the TSM all the time while Oracle is idle a large portion of the time.
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Thanks for everybody for your responses, I'll try to sum the answers here:
1. Yes, we backup the filesystem, and everything works fine. The problem is only with RMAN backups
2. Resources are not an issue, it happens on strong and weak servers (and several O/S as well)
3. Database versions are not the issue, it happens on 10.2 as well as 11.2
My feeling is that this has something to do with the integration, either oracle setting or TSM setting, but I can't be sure until I solve this.
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Whenever I run rman backup to sbt_tape, the complete database becomes slow. Also RMAN takes more than 12 hours to complete.
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allocate channel t1 type 'sbt_tape' parms 'ENV=(TDPO_OPTFILE=/usr/tivoli/tsm/client/oracle/bin64/tdpo.opt)';
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db file sequential read                    817,467     17,419         21                         28.6         User I/O
CPU time                                  14,294                              23.5
log file sync                            141,642     8,570         61                         14.1          Commit
enq: TX - row lock contention              3,371     7,171       2,127                          11.8         Application
log file parallel write                     149,486     5,356         36                           8.8           System I/OWhat can be done? Can anyone tell what wrong is happening here?
Database is 10.2.0.4
OS is AIX 5.3
SGA_TARGET is 6G
PGA_AGGREGATE_TARGET is 2G
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SA

On my server, we needed to adjust the vmm on aix for oracle to run best. Before I did that it was really slow.
http://www.ibm.com/developerworks/aix/library/au-aixoracle/index.html
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Listing 3. Changing the default setting for the lru_file_repage parameter using vmo
root@lpar21ml16ed_pub[] > vmo -o lru_file_repage=0
Setting lru_file_repage to 0
root@lpar21ml16ed_pub[] >
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vmo -p -o minperm%=5
vmo -p -o maxperm%=90
vmo -p -o maxclient%=90
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Listing 5. Setting the minfree and maxfree parameters
vmo -p -o minfree=960
vmo -p -o maxfree=1088
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Hi Rajesh,
Thanks for the reply.The script contains the controlfile autobackup option.I have deleted the SBT tape's old backups using RMAN. But the volume space not reduced. This is the script we are using for backup.
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I would appreciate some pointers on this if possible, as I'm a bit of an rman novice.
Our rman backup logs indicated a failure and in the directory where it puts its files there appeared a large number of files for the 18th, which was the date of the failure. Previous days backups generated 5 files of moderate size. When it failed it generated between 30 - 40 G of files ( it looks like one for each database file ).
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Thanks in advance - George
-rw-r----- 1 oracle dba 1073750016 Jan 18 00:03 database_f734055071_s244_s1
-rw-r----- 1 oracle dba 1073750016 Jan 18 00:03 database_f734055096_s245_s1
-rw-r----- 1 oracle dba 1073750016 Jan 18 00:03 database_f734573008_s281_s1
-rw-r----- 1 oracle dba 1073750016 Jan 18 00:03 database_f734055045_s243_s1
-rw-r----- 1 oracle dba 524296192 Jan 18 00:03 database_f734055121_s246_s1
-rw-r----- 1 oracle dba 1073750016 Jan 18 00:03 database_f734055020_s242_s1
-rw-r----- 1 oracle dba 4294975488 Jan 18 00:02 database_f734054454_s233_s1
-rw-r----- 1 oracle dba 4294975488 Jan 18 00:02 database_f734054519_s234_s1
-rw-r----- 1 oracle dba 4294975488 Jan 18 00:02 database_f734054595_s235_s1
-rw-r----- 1 oracle dba 4294975488 Jan 18 00:02 database_f734054660_s236_s1
-rw-r----- 1 oracle dba 4294975488 Jan 18 00:02 database_f734054725_s237_s1
-rw-r----- 1 oracle dba 4294975488 Jan 18 00:02 database_f734054790_s238_s1
-rw-r----- 1 oracle dba 209723392 Jan 18 00:02 database_f734055136_s247_s1
-rw-r----- 1 oracle dba 73408512 Jan 18 00:02 database_f734055143_s248_s1
-rw-r----- 1 oracle dba 67117056 Jan 18 00:02 database_f734055146_s249_s1
-rw-r----- 1 oracle dba 4194312192 Jan 18 00:02 database_f734054855_s239_s1
-rw-r----- 1 oracle dba 2147491840 Jan 18 00:02 database_f734054975_s241_s1
-rw-r----- 1 oracle dba 3221233664 Jan 18 00:02 database_f734054920_s240_s1
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-rw-r----- 1 oracle dba 1343488 Jan 17 00:15 database_f740621746_s624_s1
-rw-r----- 1 oracle dba 2958848 Jan 17 00:15 database_f740621745_s623_s1
-rw-r----- 1 oracle dba 6415990784 Jan 17 00:15 database_f740620829_s622_s1
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george3 wrote:
Ok, perhaps its my understanding of RMAN that is at fault. From the logs :
Starting recover at 18-JAN-11
channel m1: starting incremental datafile backup set restore
channel m1: specifying datafile copies to recover
recovering datafile copy file number=00001
name=/exlibris1/rmanbackup/database_f734055020_s242_s1
recovering datafile copy file number=00002
name=/exlibris1/rmanbackup/database_f734055045_s243_s1
it seems to make backup copies of the datafiles every night, so the creation of these large files is normal ?Above results indicate that you have full (incremental level 0) backup(all datafiles copies ) and there happen update/recover (applying incremental level 1) backup.So there was happen applying */exlibris1/rmanbackup/database_f734055045_s243_s1* inremental backup to full(level 1) backup.And size should be normal
Why is it making copies of the datafiles even on days of incrementals ?
Because after getting level 1 backup and need applying and every day will apply one incremental backup.

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Database: Oracle 10.2.0.4 on HP
I have a catalog database that is the catalog for 4 production databases on different servers. Recently I cleaned up the catalog using below statements in a script and cleaned up old records.
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Hi 860412,
Normallly the overhead of DML on the catalog is not the issue for slow running backups.
Can you do a test to run a backup without using the catalog and do a resync in a separate step?
Do you have something like OEM to check the performance of both the catalog and the target during the backup?
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Thanks&Regards,
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L1_OracleL1_Daily completed
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RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
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RMAN exited with return code '1'.
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