Oracle-L: RE: Good technical documents/references on tuning restores

From: <Paula_Stankus_at_doh.state.fl.us>
Date: Tue, 03 Jun 2003 17:44:54 -0800
Message-ID: <F001.005A979C.20030603174454@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

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Received on Tue Jun 03 2003 - 20:44:54 CDT