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Thread: SGA sizing ...

  1. #1
    Join Date
    Jul 2000

    Thumbs up

    can anybody pls throw some light on how to size the SGA while setting up the database ... also pls suggest me any online information avabl on that .
    thanx in advance ..

  2. #2
    Join Date
    Apr 2000
    Sga - not > 30% of your RAM system-machine.
    Sga depends on what kind of database you are going to biul
    (the size of db - small, large, XL etc..)
    take a look here: [url]http://info-it.umsystem.edu/oradocs/doc/server/doc/SCN73/ch9.htm[/url]

  3. #3
    Join Date
    Nov 2000

    SGA sizing ...

    Basically the SGA should be around 40-45% of your physical RAM.

    If block size is 2k(2048 bytes) then the log_buffer_size should be minimum of 4 times of block size.i.e it should be 8k(8192 bytes).

    The db_block_size is multiplied to db_block_buffers to get the total block buffer size.
    The remaining is alloted to Shared_pool_size. Basically for small database 3 MB is allotted. Medium 7MB. Large 10 MB or more. Depending upon the situation and the memory capacity.

    To add flavor to the SGA, Sort_Area_Size is allotted enough space.

    Incresing the block size alone will increase the performance of the database.

  4. #4
    Join Date
    Oct 2000
    thanks for shredding some light on SGA..
    could you also explain how variable size is calculated and how redobuffers are calculated.

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