DB_File Not getting hash values

[Ramprasad A Padmanabhan]

Hi,
  I have a simple script that reads a hashDB  file into a tied hash.
When I do a Dumper , I get the hash values , but when I pring a value 
nothing is printed ... what am I doing wrong here ?

--------------------------------------------
use DB_File;
use strict;
use Data::Dumper;
my %hash;
my $DATAFILE = "sample.db";
tie %hash,  'DB_File', $DATAFILE, O_RDONLY , 0666 , $DB_HASH;
print Dumper([\%hash]);
print "VALUE for a is '" . $hash{a}."' \n";
---------------------------------------------------------
OUTPUT
-------------------------------------------------------
$VAR1 = [
          {
            'b' => '2',
            'a' => '1',
            'c' => '3'
          }
        ];
VALUE for a is ''
---------------------------------------------------------
Thanks
Ram
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