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Table Compression

  • 1.  Table Compression

    IBM Champion
    Posted Wed January 05, 2022 04:08 PM
    Edited by TOM GIRSCH Wed January 05, 2022 04:58 PM

    All:

    I'm finally getting around to playing with compression in 14.10, and am a bit puzzled. I've got a really large, wide table -- 88 million rows, 276 columns, 2,299 bytes per record -- that seems like it would be an excellent candidate for compression. But when I did a compression test on it, the savings was less than 8%. The majority of the columns are numeric, but still, I'd expect better than that.

    When I output the table data to 'gzip -1' I get something on the order of 73% savings.

    Anyone have experience with this?

    Note: For testing, I made both the extent size and the next size very small, so we shouldn't be looking at a lot of empty tablespace.

    TIA,

    - TJG



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    TOM GIRSCH
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