I got this simple script that i can't get it work. I am trying to tie an existing db but it dies when tie.
the db file exists in the same dir where the perl script is. and it's read/writable by me. 

#!/usr/bin/perl -w

use strict;
use DB_File;

my %db;
tie (%db,'DB_File',"mydb.db",O_RDONLY) or die "tie : $!";
untie %db;

[download]
it simply dies with tie :  at t.pl line 9.

I followed tye's suggestion and traced it with perl debugger. but I don't see anything wrong (still new to perl debugger) here is the trace if it helps

main::(t.pl:9): tie (%db,'DB_File',"movies.db",O_RDONLY) or die "tie :
+ $!";
  DB<1> s
Fcntl::AUTOLOAD(/usr/lib/perl5/5.6.0/i386-linux/Fcntl.pm:203):
203:        (my $constname = $AUTOLOAD) =~ s/.*:://;
  DB<1> s
Fcntl::AUTOLOAD(/usr/lib/perl5/5.6.0/i386-linux/Fcntl.pm:204):
204:        my $val = constant($constname, 0);
  DB<1> s
Fcntl::AUTOLOAD(/usr/lib/perl5/5.6.0/i386-linux/Fcntl.pm:205):
205:        if ($! != 0) {
  DB<1> s
Fcntl::AUTOLOAD(/usr/lib/perl5/5.6.0/i386-linux/Fcntl.pm:216):
216:        *$AUTOLOAD = sub { $val };
  DB<1> s
Fcntl::AUTOLOAD(/usr/lib/perl5/5.6.0/i386-linux/Fcntl.pm:217):
217:        goto &$AUTOLOAD;
  DB<1> s
Fcntl::__ANON__[/usr/lib/perl5/5.6.0/i386-linux/Fcntl.pm:216](/usr/lib
+/perl5/5.6.0/i386-linux/Fcntl.pm:216):
216:        *$AUTOLOAD = sub { $val };
  DB<1> s
DB_File::TIEHASH(/usr/lib/perl5/5.6.0/i386-linux/DB_File.pm:264):
264:        tie_hash_or_array(@_) ;
  DB<1> s
DB_File::tie_hash_or_array(/usr/lib/perl5/5.6.0/i386-linux/DB_File.pm:
+244):
244:        my (@arg) = @_ ;
  DB<1> s
DB_File::tie_hash_or_array(/usr/lib/perl5/5.6.0/i386-linux/DB_File.pm:
+246):
246:        my $tieHASH = ( (caller(1))[3] =~ /TIEHASH/ ) ;
  DB<1> s
DB_File::tie_hash_or_array(/usr/lib/perl5/5.6.0/i386-linux/DB_File.pm:
+249):
249:            if @arg >= 5 && ref $arg[4] && $arg[4] =~ /=HASH/ && t
+ied %{ $arg[4] } ;
  DB<1> s
DB_File::tie_hash_or_array(/usr/lib/perl5/5.6.0/i386-linux/DB_File.pm:
+252):
252:        if ($db_version > 1 and defined $arg[4] and $arg[4] =~ /RE
+CNO/ and
253:            $arg[1] and ! -e $arg[1]) {
  DB<1> s
DB_File::tie_hash_or_array(/usr/lib/perl5/5.6.0/i386-linux/DB_File.pm:
+259):
259:        DoTie_($tieHASH, @arg) ;
  DB<1> s
tie :  at t.pl line 9, <IN> line 14.
Debugged program terminated.  Use q to quit or R to restart,

[download]
line 244:        my (@arg) = @_ ; here @_ contains DB_File,mydb.db,0

In reply to DB_File tie failed by Qiang

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