ORA-01466: unable to read data - table definition has changed
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Thread: ORA-01466: unable to read data - table definition has changed

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  1. #1
    Join Date
    Jul 2003
    Posts
    134

    ORA-01466: unable to read data - table definition has changed

    I am trying to query between versions for flashback and am getting the following error:

    SQL> SELECT versions_startscn, versions_starttime,
    2 versions_endscn, versions_endtime,
    3 versions_xid, versions_operation,
    4 description
    5 FROM flashback_version_query_test
    6 VERSIONS BETWEEN TIMESTAMP TO_TIMESTAMP('2004-07-06 11:29:48', 'YYYY-MM-DD HH24:MI:SS')
    7 AND TO_TIMESTAMP('2004-07-06 11:30:32', 'YYYY-MM-DD HH24:MI:SS')
    8 WHERE id = 1;
    FROM flashback_version_query_test
    *
    ERROR at line 5:
    ORA-01466: unable to read data - table definition has changed

    The flashback is configured successfuly and the time I have put in is also correct.

    Can someone tell me what could be the issue..

  2. #2
    Join Date
    Jan 2000
    Location
    Chester, England.
    Posts
    818
    There might be tiny clue in the error message.

  3. #3
    Join Date
    Jul 2003
    Posts
    134
    Originally posted by JMac
    There might be tiny clue in the error message.
    What is it? The timestamps I have input are the ones basically before and after an update transaction (committed transaction). So when I query, it should give me data instead of the error, assuming the flashback recovery area is configured successfully. So...

  4. #4
    Join Date
    Aug 2002
    Location
    Atlanta
    Posts
    1,187

    Re: ORA-01466: unable to read data - table definition has changed

    Originally posted by Vipassana
    I am trying to query between versions for flashback and am getting the following error:

    SQL> SELECT versions_startscn, versions_starttime,
    2 versions_endscn, versions_endtime,
    3 versions_xid, versions_operation,
    4 description
    5 FROM flashback_version_query_test
    6 VERSIONS BETWEEN TIMESTAMP TO_TIMESTAMP('2004-07-06 11:29:48', 'YYYY-MM-DD HH24:MI:SS')
    7 AND TO_TIMESTAMP('2004-07-06 11:30:32', 'YYYY-MM-DD HH24:MI:SS')
    8 WHERE id = 1;
    FROM flashback_version_query_test
    *
    ERROR at line 5:
    ORA-01466: unable to read data - table definition has changed

    The flashback is configured successfuly and the time I have put in is also correct.

    Can someone tell me what could be the issue..

    It looks as though you are trying to view the data in too discrete of a time period. You can only hope to be accurate with dbms_flashback to +/- 5 minutes so even though you invoked flashback query at time X it may actually be time X +/- 5 minutes

    Steve
    I'm stmontgo and I approve of this message

  5. #5
    Join Date
    Jan 2001
    Posts
    2,828

    Re: ORA-01466: unable to read data - table definition has changed

    Hi Vips

    Flashback will not work if u perform DDL in between..not in any version of oracle..

    if you want to test flashback..there should not be ddl performed on the the object in question

    regards
    Hrishy

    Originally posted by Vipassana
    I am trying to query between versions for flashback and am getting the following error:

    SQL> SELECT versions_startscn, versions_starttime,
    2 versions_endscn, versions_endtime,
    3 versions_xid, versions_operation,
    4 description
    5 FROM flashback_version_query_test
    6 VERSIONS BETWEEN TIMESTAMP TO_TIMESTAMP('2004-07-06 11:29:48', 'YYYY-MM-DD HH24:MI:SS')
    7 AND TO_TIMESTAMP('2004-07-06 11:30:32', 'YYYY-MM-DD HH24:MI:SS')
    8 WHERE id = 1;
    FROM flashback_version_query_test
    *
    ERROR at line 5:
    ORA-01466: unable to read data - table definition has changed

    The flashback is configured successfuly and the time I have put in is also correct.

    Can someone tell me what could be the issue..

  6. #6
    Join Date
    Aug 2002
    Location
    Atlanta
    Posts
    1,187

    Re: Re: ORA-01466: unable to read data - table definition has changed

    Originally posted by hrishy
    Hi Vips

    Flashback will not work if u perform DDL in between..not in any version of oracle..

    if you want to test flashback..there should not be ddl performed on the the object in question

    regards
    Hrishy
    yeah that was sort of my point

    if you create table at 9:00 with some dummy data and then
    at 9:01 you update the table and then
    at 9:04 you invoke dbms_flasback for 9:00 then you might encounter the error condition that the user encountered as dbms_flashback is only accurate to within 5 minute increment from the time of the initial SCN at db startup
    I'm stmontgo and I approve of this message

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