uncommitted data in datafiles
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Thread: uncommitted data in datafiles

  1. #1
    Join Date
    Jul 2003
    Posts
    3

    uncommitted data in datafiles

    Lets assume an update statement affects a large number of rows. There is no committ given for a very long time, assuming that there is no space in database buffer cache, these uncommitted data is propogated to the datafiles.

    My question is



    1. At some point of time these changed data in buffer cache will not be available. Since space has to be allocated for new data (Is my understanding Correct)

    3. Where does this uncommitted data reside in the datafile.

    2. Lets assume the user issues a committ statement after 3 days. WHat actually Happens ?. What happens to the data that is present as uncommitted data in the datafile. Also the buffers of this data is no more in the buffer cache. WIll it once again retrieve the old original data from the datafile ?????.


    I hope my question is understandable, Please guys this concept is haunting me, help me out to understand.


    Regards

    Khan
    Asad Khan

  2. #2
    Join Date
    Aug 2002
    Location
    Colorado Springs
    Posts
    5,253
    I wouldsuggest having a read of Chapter 16 of the Concepts Guide, in aprticulari think your questions are anwered by this section
    David Aldridge,
    "The Oracle Sponge"

    Senior Manager, Business Intelligence Development
    XM Satellite Radio
    Washington, DC

    Oracle ACE

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