optimal_logfile_size
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Thread: optimal_logfile_size

  1. #1
    Join Date
    Sep 2006
    Posts
    114

    optimal_logfile_size

    From a book
    A new column optimal_logfile_size is now available in v$instance_recovery.This column shows the redo logfile size in MB which is considered an optimal size
    But when i run the following

    SQL> select optimal_logfile_size
    2 from v$instance_recovery;

    OPTIMAL_LOGFILE_SIZE
    --------------------

    What else i have to check?
    can anybody help me in this regard?
    thanx in advance

  2. #2
    Join Date
    Sep 2005
    Posts
    278
    You need to set fast_start_mttr_target to get the value.

  3. #3
    Join Date
    Nov 2006
    Location
    Sofia
    Posts
    630
    You need to understand the concept of incremental checkpoints and the impact to the instance recovery time and then to decide on that.
    I would not say that this is the optimal size, but rather this is the minimal size you need, in order to cjeckpoiint as rare as required by FAST_START_MTTR_TARGET which would theoretically lead to better performance

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