Re: Lengthening backup

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@xxxxxxx>
To: oracle-l@xxxxxxxxxxxxx
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@xxxxxxx>
To: oracle-l@xxxxxxxxxxxxx
Sent: 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 ----- 
From: Allen, Brandon 
To: terrysutton@xxxxxxx ; oracle-l@xxxxxxxxxxxxx 
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?




From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Terry Sutton


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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