#Writer
use BerkeleyDB ;
use Carp ;

use strict ;

my $dbenv = BerkeleyDB::Env->new(
                                 -Home => './' ,
                                 -Flags =>  DB_CREATE|DB_INIT_CDB|DB_INIT_MPOOL
                                 ) or confess("cannot open environment: $BerkeleyDB::Error\n");

my $dbq   = BerkeleyDB::Queue->new(
                                   -Filename => 'bigQ.queue' ,
                                   -Flags      => DB_CREATE,
                                   -Len        => 32,
                                   -Env        => $dbenv
                                   ) or confess("cannot open queue: $BerkeleyDB::Error\n");

$dbq->db_put(undef , 'toto');

##</code><code>##

# Reader
use BerkeleyDB ;
use Carp ;

use strict ;

my $dbenv = BerkeleyDB::Env->new(
                                 -Home => './' ,
                                 -Flags =>  DB_CREATE|DB_INIT_CDB|DB_INIT_MPOOL
                                 ) or confess("cannot open environment: $BerkeleyDB::Error\n");

my $dbq   = BerkeleyDB::Queue->new(
                                   -Filename => 'bigQ.queue' ,
                                   -Flags      => DB_CREATE,
                                   -Len        => 32,
                                   -Env        => $dbenv
                                   ) or confess("cannot open queue: $BerkeleyDB::Error\n");

our $data = "" ;
my $status = $dbq->db_get(undef , $data , DB_CONSUME) ;

print "Status: $status\n" ;
print $data , "\n" ;

##</code><code>##

Status: DB_NOTFOUND: No matching key/data pair found

##</code><code>##

Modification of a read-only value attempted at reader.pl line 19