Re: Good technical documents/references on tuning restores

RE: Good technical documents/references on tuning restoresPaula, Have you tried backing up your controlfile to trace, editing the trace file to get rid of the unwanted datafiles, and reopening the database with the new edited controlfile? That should get rid of them. Of course, to a backup immediately after this.

Good luck,
Ruth

• Original Message ----- From: Henry Poras To: Multiple recipients of list ORACLE-L Sent: Wednesday, June 04, 2003 10:09 AM Subject: RE: Good technical documents/references on tuning restores

  Paula,

  IIRC 'MISSING' means it is in the data dictionary, but not the control file. I've gotten that before, but haven't played that game in a while. You might be able to 'DROP' them, but I'm not sure. Check that first on a mini-test system.

  Henry

    -----Original Message-----
    From: root_at_fatcity.com [mailto:root_at_fatcity.com]On Behalf Of Paula_Stankus_at_doh.state.fl.us     Sent: Tuesday, June 03, 2003 11:05 PM     To: Multiple recipients of list ORACLE-L     Subject: RE: Good technical documents/references on tuning restores

    Okay,

    Database open and I wanted to not restore and not reference certain index and materia. view datafiles. Now the datafiles show up with weird MISSING...... names. How do I clean this up?

    Thanks,
    paula
-----Original Message-----

      From: Paula_Stankus_at_doh.state.fl.us [mailto:Paula_Stankus_at_doh.state.fl.us]
      Sent: Tuesday, June 03, 2003 10:20 PM
      To: Multiple recipients of list ORACLE-L
      Subject: RE: Good technical documents/references on tuning restores


      Strange: 

      looking at v$backup_async_io found some datafiles where 
              active bytes per sec            long-waits 
             2154608                          297   
               7489829                                297  

      How can I start finding the disparity?  



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

      From: Stankus, Paula G 
      Sent: Tuesday, June 03, 2003 9:05 PM 
      To: Stankus, Paula G; 'ORACLE-L_at_fatcity.com' 
      Subject: RE: Good technical documents/references on tuning restores 



      Did I say that throughout this restore/recovery process my tapes being mounted and unmounted while other database backups and cloning was occurring.  Big duh - this has got to be slowing down the process.  Any ideas on how to handle this?  Perhaps more than one tape subsystem would be better or while doing restores other backup utility is halted - hmmm - but that risks those other systems?  How can I sell that?  Hmmmm.  Maybe I will first backup to disk.  Yep, one backup to disk.  Yep.....



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

      From: Stankus, Paula G 
      Sent: Tuesday, June 03, 2003 9:00 PM 
      To: Stankus, Paula G; 'ORACLE-L_at_fatcity.com' 
      Subject: 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----- 

      From: Stankus, Paula G 
      Sent: Tuesday, June 03, 2003 8:53 PM 
      To: Stankus, Paula G; 'ORACLE-L_at_fatcity.com' 
      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----- 

      From: Stankus, Paula G 
      Sent: Tuesday, June 03, 2003 8:46 PM 
      To: Stankus, Paula G; 'ORACLE-L_at_fatcity.com' 
      Subject: RE: Good technical documents/references on tuning restores 



      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----- 

      From: Stankus, Paula G 
      Sent: Tuesday, June 03, 2003 8:40 PM 
      To: Stankus, Paula G; 'ORACLE-L_at_fatcity.com' 
      Subject: RE: Good technical documents/references on tuning restores 



      Also found on monitoring performance of RMAN jobs: 
      Note:144640.1 on Metalink 



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

      From: Stankus, Paula G 
      Sent: Tuesday, June 03, 2003 8:36 PM 
      To: Stankus, Paula G; 'ORACLE-L_at_fatcity.com' 
      Subject: RE: Good technical documents/references on tuning restores 



      Found this white paper: 

      http://otn.oracle.com/deploy/availability/pdf/rman_performance_wp.pdf 

      Anything better? 



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

      From: Stankus, Paula G 
      Sent: Tuesday, June 03, 2003 8:33 PM 
      To: Stankus, Paula G; 'ORACLE-L_at_fatcity.com' 
      Subject: RE: Good technical documents/references on tuning restores 



      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----- 

      From: Stankus, Paula G 
      Sent: Tuesday, June 03, 2003 8:28 PM 
      To: Stankus, Paula G; 'ORACLE-L_at_fatcity.com' 
      Subject: RE: Good technical documents/references on tuning restores 



      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----- 

      From: Stankus, Paula G 
      Sent: Tuesday, June 03, 2003 8:25 PM 
      To: 'ORACLE-L_at_fatcity.com' 
      Subject: RE: Good technical documents/references on tuning restores 



      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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Author: Ruth Gramolini
  INET: rgramolini_at_tax.state.vt.us

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