rman backup hang
DBAsupport.com Forums - Powered by vBulletin
Results 1 to 9 of 9

Thread: rman backup hang

Hybrid View

  1. #1
    Join Date
    Aug 2000
    Location
    Jolo, Sulu
    Posts
    639

    rman backup hang

    Hi Friends,

    I've just seen weird things about my rman backup to disk.
    I run rman backup on 8i AIX 4.3.3. but I forgot to set the output format to direct it to a bigger disk space which is in /u04. Instead it defaulted to /u01/app/oracle/product/8.1.7/dbs. So I aborted the process immediately. When I ls -l the size of the output, i was surprised that it is 16Gb+ but my /u01 disk has onlly 2gb freespace.
    It seems that it is taking a virtual space from somewhere? Is this normal about rman backups? Can I delete the output or do i have to
    run some rman cleanup commands whenever I aborted an rman process.

    I rerun the process again using the right output disk and i check
    the outfile size and they have same size with the first aborted one.
    But the process is taking so long. I wonder if it got locked up with
    the aborted 1st run.


    Thanks a lot for ur unfailing support

  2. #2
    Join Date
    Aug 2002
    Location
    Bangalore, India
    Posts
    405
    Never seen such situation before. But, I would dig into this issue using wait events. Get SID for the processes like %rman%' and check wait events.
    -nagarjuna

  3. #3
    Join Date
    Aug 2000
    Location
    Jolo, Sulu
    Posts
    639
    Thanks hun,

    I just thought RMAN output would be a compressed one like export.
    I get 2.5gb when i exported the whole db. but rman got 15gb.
    does it copy the whole file systems? how about large temp and rbs
    tablespaces that doesnt have data contents or data tablespaces that
    have few or no tables yet.

  4. #4
    Join Date
    Nov 2000
    Location
    greenwich.ct.us
    Posts
    9,092
    Originally posted by kris123

    I just thought RMAN output would be a compressed one like export.
    I get 2.5gb when i exported the whole db. but rman got 15gb.

    of course. rman is a backup. it includes data, indexes, free space, etc. exp is a dump of your data only.


    does it copy the whole file systems?

    yes


    how about large temp and rbs
    tablespaces that doesnt have data contents or data tablespaces that
    have few or no tables yet.
    temp, maybe yes maybe no. depends on how you have created it.

    rbs, absolutely. This is crucial for a valid recovery.

    empty tablespaces, maybe yes maybe no. rman doesn't backup blocks that were never used, but does backup blocks that were used at one time but are empty now.
    Jeff Hunter
    marist89@yahoo.com
    http://marist89.blogspot.com/
    Get Firefox!
    "I pledge to stop eating sharks fin soup and will not do so under any circumstances."

  5. #5
    Join Date
    Aug 2000
    Location
    Jolo, Sulu
    Posts
    639
    Thanks genius

    Our undo and temp tablespace sometimes grow up to 10gb each,
    Im thinking it might be a good practice to shrink thier sizes to si 500mb before starting RMAN backup.

  6. #6
    Join Date
    Sep 2002
    Location
    England
    Posts
    7,333
    or just excluse it from the backup, dont need it for recovery

  7. #7
    Join Date
    Nov 2000
    Location
    greenwich.ct.us
    Posts
    9,092
    Originally posted by davey23uk
    or just excluse it from the backup, dont need it for recovery
    You don't need undo for recovery?
    Jeff Hunter
    marist89@yahoo.com
    http://marist89.blogspot.com/
    Get Firefox!
    "I pledge to stop eating sharks fin soup and will not do so under any circumstances."

  8. #8
    Join Date
    Sep 2002
    Location
    England
    Posts
    7,333
    meant temp, didnt see undo in there

  9. #9
    Join Date
    Nov 2002
    Location
    Geneva Switzerland
    Posts
    3,142
    Originally posted by kris123
    does it copy the whole file systems?
    I thought not . . . blocks that have never been occupied are not backed up.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  



Click Here to Expand Forum to Full Width