Hi, monks. We have a very trouble. We want to use BerkeleyDB for store data (analog Shared Memory).
We write a interface for this - MyMemory.pm module.

package MyMemory;

use strict;
use Data::Dumper;
use MIME::Base64;

use BerkeleyDB;

use vars qw(@ISA @EXPORT @EXPORT_OK $VERSION);
 
require Exporter;
$VERSION=0.1;
@ISA=qw(Exporter);
@EXPORT=qw(get_memory set_memory clear_all_memory SerializeR UnSeriali
+zeR);

my $filename = "/home/test/mem.db";
my %h;

tie %h, "BerkeleyDB::Hash",
         -Filename => $filename,
         -Flags    => DB_CREATE
    or die "Cannot open file $filename: $! $BerkeleyDB::Error\n";


sub get_memory {    
    my $Key=shift;        
    return UnSerializeR($h{$Key});
}

sub set_memory {
    my $Key=shift;
    my %Value = @_;
    $h{$Key}=SerializeR(\%Value);
}

sub clear_all_memory {
    %h={};
}


sub SerializeR
{
    my $SValue = shift;
    my $SSerialized;
    if (ref $SValue eq "HASH")
    {
        $SSerialized = "HASH";
        while (my ($key, $val) = each %$SValue ) { $SSerialized .= enc
+ode_base64($key) . ':' . SerializeR($val) . ';'; }
    }
    elsif (ref $SValue eq "ARRAY")
    {
        $SSerialized = "ARRAY";
        foreach my $var (@$SValue) { $SSerialized .= SerializeR($var) 
+. ';'; }
    }
    else { $SSerialized = $SValue; }

return encode_base64($SSerialized);
}

sub UnSerializeR
{
    my $SSerialized = decode_base64(shift);
    my $SData;

    if ($SSerialized =~m/^HASH/)
    {
        my %HData;
        my @ATMP = split /;/, substr($SSerialized, 4);
        foreach (@ATMP)
        {
            split /:/;
            $HData{decode_base64($_[0])} = UnSerializeR($_[1]);
        }
        $SData = \%HData;
    }
    elsif ($SSerialized =~m/^ARRAY/)
    {
        my @AData;
        my @ATMP = split /;/, substr($SSerialized, 5);
        foreach my $var (@ATMP)
        {
            push(@AData, UnSerializeR($var));
        }
        $SData = \@AData;
    }
    else { $SData = $SSerialized; }

return $SData;
}

 
1;
[download]

In browser:
Software error:
BerkeleyDB Aborting: Database is already closed at /usr/local/lib/perl5/site_perl/5.8.6/mach/BerkeleyDB.pm line 1204.

We have a 25-30 httpd procesed (mod_perl). And I think, when we use get_memory from first process - we don't have any error, but when we use get_memory from second process - we have a error;

If we write "tie %h ..." in get_memory and set_memory subs - we don't have error, but we have a too many connections to BerkeleyDB.

Please help...

P.S."Sorry for bad English. I work on this."