The ENABLE/DISABLE COMPRESSION option in the DEFINE RELATION
    statement is obsolete. Use the DEFINE STORAGE MAP and CHANGE
    STORAGE MAP statements to control data compression. The
    COMPRESSION option in the DEFINE RELATION statement is maintained
    for compatibility with applications that used previous versions
    of Oracle Rdb. However, Rdb recommends you use the DEFINE STORAGE
    MAP statement rather than the DEFINE RELATION statement to control
    data compression.