SYNOPSIS
use SDBM_File; # or DB_File, GDBM_File, NDBM_File, ODBM_File
use DBM_Filter ;
$db = tie %hash, ...
$db->Filter_Push('compress');
DESCRIPTION
This DBM filter will compress all data before it is written to the database and uncompressed it on reading.A fatal error will be thrown if the Compress::Zlib module is not available.