ora_ixxx processes are created by rman to and the dbms_backup_restore to backup the database.
ytry ot see during a backup run how many ora_i processes are there.
i've seen ora_i processes hang for a number of reasons including lost network communication and issues with rman communicating to the media management
most of our issues weere lrelated ot the media management front.
i would run rman in debug mode.
set debug on
in the rman script
and see between calls what is it performing.
if this is aix rman uses aio servers and you might have acontention there.
the only otherpoint is monitoring the large pool as the problem week start to see if the large pool is fragmented .
----- Original Message ----
From: Terry Sutton <terrysutton@usa.net>
To: oracle-l@freelists.org
Sent: Saturday, July 8, 2006 4:16:51 PM
Subject: Re: Lengthening backup
Faud,
What's an ora_i process? The oracle processes (besides connections) I see are:
oracle@:/export/home/oracle $ ps -ef | grep ora_
oracle 15349 1 0 Mar 20 ? 803:07 ora_dbw2_DBNAME
oracle 15343 1 0 Mar 20 ? 0:18 ora_pmon_DBNAME
oracle 15365 1 0 Mar 20 ? 24:03 ora_snp0_DBNAME
oracle 15363 1
0 Mar 20 ? 0:05 ora_reco_DBNAME
oracle 15371 1 0 Mar 20 ? 123:15 ora_arc0_DBNAME
oracle 15383 1 0 Mar 20 ? 116:37 ora_arc6_DBNAME
oracle 15359 1 0 Mar 20 ? 2345:43 ora_ckpt_DBNAME
oracle 15355 1 0 Mar 20 ? 796:49 ora_dbw5_DBNAME
oracle 15353 1 0 Mar 20 ? 776:13 ora_dbw4_DBNAME
oracle 15367 1 0 Mar 20 ? 15:36 ora_snp1_DBNAME
oracle 15351 1 0 Mar 20
? 785:47 ora_dbw3_DBNAME
oracle 15369 1 0 Mar 20 ? 30:50 ora_snp2_DBNAME
oracle 12533 11168 0 14:15:15 pts/7 0:00 grep ora_
oracle 15357 1 1 Mar 20 ? 5559:09 ora_lgwr_DBNAME
oracle 15381 1 0 Mar 20 ? 103:16 ora_arc5_DBNAME
oracle 15347 1 0 Mar 20 ? 781:11 ora_dbw1_DBNAME
oracle 15373 1 0 Mar 20 ? 102:51 ora_arc1_DBNAME
oracle 15375 1 0 Mar 20 ? 119:24 ora_arc2_DBNAME
oracle
15379 1 0 Mar 20 ? 122:43 ora_arc4_DBNAME
oracle 15345 1 0 Mar 20 ? 793:48 ora_dbw0_DBNAME
oracle 15361 1 0 Mar 20 ? 119:17 ora_smon_DBNAME
oracle 15377 1 0 Mar 20 ? 103:31 ora_arc3_DBNAME
oracle 15385 1 0 Mar 20 ? 104:06 ora_arc7_DBNAME
--Terry
the first week when the problem starts i would look at the ora_i process. we had the excact same problem with ora_i being hung and oracle spawing more ora_i processes until the backusp became real slow and used to crawl to a halt.
killing the previous ora_i processes immediately solved the issues.
----- Original Message ----
From: Terry Sutton <
terrysutton@usa.net>
To:
oracle-l@freelists.orgSent: Friday, July 7, 2006 2:01:16 PM
Subject: Re: Lengthening backup
SQL> SELECT DISTINCT(incremental_level)
FROM rc_backup_set WHERE db_id = 435051864
AND start_time > SYSDATE -10;
INCREMENTAL_LEVEL
-----------------
So the incremental level is null.
--Terry
----- Original Message -----
Sent: Friday, July 07, 2006 11:43 AM
Subject: RE: Lengthening backup
The only thing I can think of that would cause such behaviour is if for some reason you were actually running a cumulative incremental backup. From the script you've shown, that doesn't appear to be the case, but could you check the incremental_level of the rc_backup_set view in your recovery catalog and verify?
I'm having some issues with a client's RMAN backup. They're on Oracle 8.1.7.4, Solaris 8. It's a weekly full backup, and they're backing up ~1.5TB to disk, and the longer the instance is up, the longer the backup takes.
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