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RE: Good technical documents/references on tuning restores

From: Saira Somani <saira_somani_at_yahoo.com>
Date: Thu, 05 Jun 2003 10:59:43 -0800
Message-ID: <F001.005AB2E9.20030605105943@fatcity.com>


We've had this occur before. Check connections at the physical layer they might be loose. We changed the Ethernet cable and it seemed to work optimally after that. The cable should ideally be better (more insulated) than the generic store brand [I think] but I am not a network expert.  

Hope that helps.
Saira  

-----Original Message-----

Paula_Stankus_at_doh.state.fl.us
Sent: June 5, 2003 12:35 PM
To: Multiple recipients of list ORACLE-L  

10/100 Mb/sec ethernet. So, if it is slow any advice? Thanks,
Paula
-----Original Message-----

Sent: Wednesday, June 04, 2003 5:52 PM
To: ORACLE-L_at_fatcity.com
Cc: Paula_Stankus_at_doh.state.fl.us
Importance: High  

That's 2.5 MB per second, which ain't bad on what I assume is 10m ethernet.
If it's on 100MB or 1G ethernet, then it's rather slow. Jared

Paula_Stankus_at_doh.state.fl.us
Sent by: root_at_fatcity.com
 06/03/2003 06:50 PM
 Please respond to ORACLE-L   

        To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>

        cc: 
        Subject:        RE: Good technical documents/references on
tuning restores  

Okay, almost 4 minutes for a datafile that was 78168 blocks - how do I know if this is reasonable?
Also, seems to write these files out (restore sychron.) why can't it restore different datafiles in parallel? - stupid question huh?
-----Original Message-----

Sent: Tuesday, June 03, 2003 8:46 PM
To: Stankus, Paula G; 'ORACLE-L_at_fatcity.com' SELECT SID, SERIAL#, CONTEXT,
 ROUND(SOFAR/TOTALWORK*100,2) "% complete", SUBSTR(TO_CHAR(SYSDATE,'HH24:MI:SS'),1,15) "Time now" FROM V$SESSION_LONGOPS
WHERE OPNAME like '%restore%';
.
showed all 100% complete but msglog from RMAN shows it is truly still running.
-----Original Message-----

Sent: Tuesday, June 03, 2003 8:40 PM
To: Stankus, Paula G; 'ORACLE-L_at_fatcity.com' Also found on monitoring performance of RMAN jobs: Note:144640.1 on Metalink
-----Original Message-----

Sent: Tuesday, June 03, 2003 8:36 PM
To: Stankus, Paula G; 'ORACLE-L_at_fatcity.com' Found this white paper:
http://otn.oracle.com/deploy/availability/pdf/rman_performance_wp.pdf Anything better?
-----Original Message-----

Sent: Tuesday, June 03, 2003 8:33 PM
To: Stankus, Paula G; 'ORACLE-L_at_fatcity.com' This is what I have set on my target database:
----------------------------------- ------- -------------------

backup_tape_io_slaves               boolean FALSE 
tape_asynch_io                      boolean TRUE 
Version 8.1.7.4 database and RMAN catalog - 32 bit Networker MML
Using RAID 1+0
Solaris 2.8
-----Original Message-----

Sent: Tuesday, June 03, 2003 8:28 PM
To: Stankus, Paula G; 'ORACLE-L_at_fatcity.com' Okay - from my reading you don't need to have multiple tape io slaves if

you are using asynch. I/O. Again, best document for perf. tuning database
restores using RMAN would make mucho difference. Read old note about someone doing an analyze on the RMAN catalog tables to improve performance
of restore. I think it has something to do with how quickly it finds the
file on tape and writes to disk.
-----Original Message-----

Sent: Tuesday, June 03, 2003 8:25 PM
To: 'ORACLE-L_at_fatcity.com'
Seems to be taking awfully long to read files from tape and write to disk.
 I allocate multiple tape channels like I do for the backup which only takes about 45 minutes. Does not seem to be spawning multiple sessions.

Do I need to change parameters on my init.ora file to use multiple tape io
slaves to see this. Anyway, would like notes/docs., references if you all
have some.
Thanks,
Paula

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Saira Somani
  INET: saira_somani_at_yahoo.com

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Received on Thu Jun 05 2003 - 13:59:43 CDT

Original text of this message

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