ORA-01555 - 9i Automatic Undo Management
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Thread: ORA-01555 - 9i Automatic Undo Management

  1. #1
    Join Date
    Jul 2001
    Posts
    108

    ORA-01555 - 9i Automatic Undo Management

    Hello,

    We are running on Oracle 9i and also we implimented all the 9i features.

    3 days back we ran into the following error:

    ORA-01555 caused by SQL statement (Query Duration=4736 sec, SCN: 0x0000.235fde04):

    I am sure the above error is a snapshot too old error, but I need your help in resolving this issue. Here are some details:

    NAME TYPE VALUE
    ------------------------------------ ----------- ---------------
    undo_management string AUTO
    undo_retention integer 900
    undo_suppress_errors boolean FALSE
    undo_tablespace string PSAPUNDO


    TABLESPACE SPACE FREE USEDSPACE FREESPACE
    ----------- ---------- ---------- ---------- ----------
    PSAPUNDO 12288000 12249536 0 100



    TABLESPACE_NAME STATUS CONTENTS EXTENT_MAN ALLOCATIO SEGMEN INITIAL_EXTENT NEXT_EXTENT
    ---------------- --------- --------- ---------- --------- ------ -------------- -----------
    PSAPUNDO ONLINE UNDO LOCAL SYSTEM MANUAL 65536

    Error:=====>

    Begin End UndoBlocks ORA-1555
    ------------------- ------------------- ---------- ----------
    2004-06-13 23:16:57 2004-06-13 23:26:57 1137 1


    --Maximum value for UPS
    Max. Undo Blocks/Sec
    --------------------
    42.3066667


    --Average value for UPS:
    AVG. Undo Blocks/Sec
    --------------------
    2.49352273


    Max. Query Length Sec
    ---------------------
    4736

    Undo Sp Req.(MB)
    ----------------
    297


    I hope I have included most of the details related to the error. Please let me know what settings will prevent the
    ORA-01555 error in the future.

    Thanks & regards,
    Nikee

  2. #2
    Join Date
    Jun 2001
    Location
    Helsinki. Finland
    Posts
    3,938

    Re: ORA-01555 - 9i Automatic Undo Management

    You had a query that took 4736 seconds, and your UNDO_RETENTION is 900 seconds. If you increase it to 5000, you will not probably see that error but can you afford to have so big UNDO tablespace? You will need in this case to increase the size of the UNDO tablespace.
    Oracle Certified Master
    Oracle Certified Professional 6i,8i,9i,10g,11g,12c
    email: ocp_9i@yahoo.com

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