Syntax options:

    ROW LENGTH IS n BYTES

    Specifies the length of each row allocated to the row cache. Rows
    are not cached if they are too large for the row cache. area. The
    ROW LENGTH is an aligned longword rounded up to the next multiple
    of 4 bytes.

    The maximum row length in a row cache is 65535 bytes.

    When the name of the cache matches the name of an existing
    logical area, ADD CACHE will calculate ROW LENGTH from the size
    of the table row, or the size of the index node (for SORTED
    RANKED, or UNIQUE SORTED indices). This cache is known as a
    logical area cache.