Syntax options:

    ENABLE COMPRESSION | DISABLE COMPRESSION

    Changes whether the rows for the table are compressed or
    uncompressed when stored. Enabling compression conserves disk
    space, but it incurs additional CPU overhead for inserting and
    retrieving compressed rows.

    Changing the COMPRESSION clause causes the database system
    to read all the rows in the table and write them back to the
    table in the changed format. If compression is enabled and you
    subsequently disable it, records may become fragmented because
    the space allowed for the record is no longer large enough.