RE: Good technical documents/references on tuning restores

From: Clarkson, Timothy T SEOP-OEIRH/1 <Timothy.Clarkson_at_shell.com>
Date: Thu, 05 Jun 2003 01:24:32 -0700
Message-ID: <F001.005A9FBF.20030604074004@fatcity.com>

I had
this problem yesterday. not sure if what I did is correct but it seemed to work for me.

1)
Create another tablespace (TEST)
2)
move the objects from the tablespace that has the missing files into TEST tablespace
<FONT

face=Arial color=#0000ff size=2> select DISTINCT TABLESPACE_NAME from dba_extents where file_id in

(select File# from v$datafile where status = 'RECOVER')
<FONT

face=Arial color=#0000ff size=2>
you
might have some problems with items that resided on the missing datafile, in my case it was only indexes so I recreated them from the schema on the new tablespace.

 select DISTINCT SEGMENT_NAME, SEGMENT_TYPE, TABLESPACE_NAME from dba_extents where file_id in

(select File# from v$datafile where status = 'RECOVER')
3)
drop the tablespace with missing datafiles 4)
move back the objects to the original tablespace

This
cleared up the mess in the v$datafile. I did this because I was under the impression that you cannot delete a datafile once it has been assigned to tablespace.


Have
not got around to missing the missing file in the TEMP space yet, as it is a test database will do that later.

Hope
this helps, I am sure someone will post a better answer soon :-)

Tim
Clarkson

-----Original Message---- From: Henry Poras [mailto:[EMAIL PROTECTED]Sent: Wednesday, June 04, 2003 3:10 PMTo: Multiple recipients of list ORACLE-LSubject: 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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of [EMAIL PROTECTED]Sent: Tuesday, June 03, 2003 11:05 PMTo: Multiple recipients of list ORACLE-LSubject: 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

      <FONT face=Tahoma 
      size=2>-----Original Message-----From: 
      [EMAIL PROTECTED] 
      [mailto:[EMAIL PROTECTED]Sent: Tuesday, June 03, 
      2003 10:20 PMTo: Multiple recipients of list 
      ORACLE-LSubject: RE: Good technical documents/references on 
      tuning restores
      Strange: 
      looking at v$backup_async_io found some datafiles 
      where         <FONT 
      size=2>active bytes per sec    
              long-waits <FONT 
      size=2>       
      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; 
      '[EMAIL PROTECTED]' 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; 
      '[EMAIL PROTECTED]' 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; 
      '[EMAIL PROTECTED]' 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; 
      '[EMAIL PROTECTED]' 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%';                           
      <FONT 
      size=2>.                                                        
      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; 
      '[EMAIL PROTECTED]' 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; 
      '[EMAIL PROTECTED]' Subject: RE: Good technical 
      documents/references on tuning restores 
      Found this white paper: 
      <A 
      href="http://otn.oracle.com/deploy/availability/pdf/rman_performance_wp.pdf" 
      target=_blank>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; 
      '[EMAIL PROTECTED]' Subject: RE: Good technical 
      documents/references on tuning restores 
      This is what I have set on my target database: 
      ----------------------------------- ------- 
      ------------------- <FONT 
      size=2>backup_tape_io_slaves               
      boolean 
      FALSE              
      <FONT 
      size=2>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; 
      '[EMAIL PROTECTED]' 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: '[EMAIL PROTECTED]' <FONT 
      size=2>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

Received on Thu Jun 05 2003 - 03:24:32 CDT