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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Good technical documents/references on tuning restores
See nwadmin shows parellism = 32. I am not the tape person - that is my sys
admin. I don't believe they actually have 32 tapes involved only 4. Can
this impact performance by setting this too high? I also notice one backup
server for networker with nwadmin messages like "clone sets being
created...", "other databases being backed up". What is the usual policy on
concurrently running backups, cloning at the same time recovery is taking
place. It appears to show a lot of media waiting events: waiting for
dlt7000 tape ... of the tapes that I specifically need for this restore.
Did I say: I love my admin...I love my admin....I love my admin...
-----Original Message-----
Sent: Tuesday, June 03, 2003 8:53 PM
To: Stankus, Paula G; 'ORACLE-L_at_fatcity.com'
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:
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: INET: Paula_Stankus_at_doh.state.fl.us Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting servicesReceived on Tue Jun 03 2003 - 20:59:57 CDT
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