G'day Ken,
thanks for your quick help.
I checked the source code of File.pm in DBM/Deep/Engine/.
the error caused by transaction slots full
the question become how to reset transaction slots ? I am keeping to debug.

sub begin_work {
    use Data::Dumper;
    my $self = shift;
    my ($obj) = @_;

    unless ($self->supports('transactions')) {
        DBM::Deep->_throw_error( "Cannot begin_work unless transaction
+s are supported" );
    }

    if ( $self->trans_id ) {
        DBM::Deep->_throw_error( "Cannot begin_work within an active t
+ransaction" );
    }

    my @slots = $self->read_txn_slots;
    print Dumper(@slots);
    my $found;
    for my $i ( 0 .. $self->num_txns-2 ) {
        print  "i,$i\n";
        next if $slots[$i];

        $slots[$i] = 1;
        $self->set_trans_id( $i + 1 );
        $found = 1;
        last;
    }
    unless ( $found ) {
        DBM::Deep->_throw_error( "Cannot allocate transaction ID" );
    }
    $self->write_txn_slots( @slots );

    if ( !$self->trans_id ) {
        DBM::Deep->_throw_error( "Cannot begin_work - no available tra
+nsactions" );
    }

    no Data::Dumper;
    return;
}

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In reply to Re^2: DBM::Deep: Cannot allocate transaction ID by fanasy
in thread DBM::Deep: Cannot allocate transaction ID by fanasy

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