perldoc > Memoize::SDBM_File(mcp)

NAME
    Memoize::SDBM_File - DEPRECATED compability shim

DESCRIPTION
    This class used to provide EXISTS support for SDBM_File before support for "EXISTS" was added to
    SDBM_File itself in Perl 5.6.0.

    Any code still using this class should be rewritten to use SBDM_File directly.