In-doubt transaction locks data required by other transactions - Oracle Transaction

Q.  The in-doubt transaction locks data that is required by other transactions and this situation occurs when the ORA-01591 error message interferes with user transactions.
- Published on 03 Aug 15

a. True
b. False

ANSWER: True
 

    Discussion

  • Nirja Shah   -Posted on 22 Sep 15
    - Override a specific in-doubt transaction manually only when one of the following conditions exists:

    1. The in-doubt transaction locks data that is required by other transactions. This situation occurs when the ORA-01591 error message interferes with user transactions.

    2. An in-doubt transaction prevents the extents of a undo segment from being used by other transactions.The first portion of the local transaction ID of an in-doubt distributed transaction corresponds to the ID of the undo segment, as listed by the data dictionary view DBA_2PC_PENDING.

    3. The failure preventing the two-phase commit phases to complete cannot be corrected in an acceptable time period. Examples of such cases include a telecommunication network that has been damaged or a damaged database that requires a long recovery time.

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