recovery
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Thread: recovery

  1. #1
    Join Date
    Oct 2000
    Posts
    17

    Question

    Hi,

    I had only one control file and I have lost it. Now I have to recover the control file. I have online backup (one day old) of all the data files and backup of control file (binary). I have all the archived redo log files as well. What is the best way to recover the control file without loss of any data..


    Regds.
    gvgp..


  2. #2
    Join Date
    Jun 2000
    Location
    Madrid, Spain
    Posts
    7,448
    1. shutdown
    2. restore backup control file & the hotbackup
    3. startup mount
    4. recover database using backup controlfile
    5. alter database open;

    part 4, recover database should do automatically, if not you will need to use until cancel option.

  3. #3
    Join Date
    Oct 2000
    Posts
    17
    Hi,

    Thanks for ur reply..

    1. Can I do the recovery by restoring only cotrol file from my backup?.

    2. I tried reocovery by following ur setps. when I use ur first open i.e recover database using backup controlfile, Oracle looking for the archived log which does not exist. Then I used recover database using backup controlfile until cancel. This works fine.

    If I use the cancel option, I have to use resetlogs while opening my database, in that case I will loose data which is in unarchived redo log i.e current logs..

    Is there any other way to recover without loosing any data.

    Thanks & regds.
    gvgp..

  4. #4
    Join Date
    Jun 2000
    Location
    Madrid, Spain
    Posts
    7,448
    aps no you cant restore controlfile only

    if you used until cancel option you must know:

    the last archived log file name and online redologs file name

    After Oracle asks the last archived log file it will keep on asking for more archived log files, in this case instead of pressing enter give it the redolog file names

  5. #5
    Join Date
    Jun 2000
    Posts
    417
    Just as a general question, if only the control file is lost, can't new ones just be created, then having everything up and running with no loss? (Assuming it's either backed up to trace, or you can write the small script to do so)

  6. #6
    Join Date
    Jun 2000
    Location
    Madrid, Spain
    Posts
    7,448
    well I havent tried it but I think in order to recreate a control file we have to shutdown the database with abort option. Then startup nomount and recreate the controlfile, the controlfile at this state doesnt contain stop SCN and any checkpoint information so if we startup straight away the files will need recovery since Oracle does two checks:

    1. Oracle compares last checkpoint in both datafile header and control file.
    2. Oracle compares the STOP SCN in control file and datafile header.

    In the first step Oracle will give us straight away an error message, something like the controlfile is too old or similar and requiere recovery, if we could pass the first step Oracle would do instance recovery but unfortunately I dont think we cant even pass the first check :o

  7. #7
    Join Date
    Apr 2000
    Location
    Bangalore
    Posts
    16
    Yes you can create the control file. Care should be taken by includng all the data files correctly.
    Thanks,
    Bhaskara

  8. #8
    Join Date
    Oct 2000
    Posts
    17
    Hi all,

    Thanks for all your suggestions.

    Rgds,
    gvgp

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