I like to use DB_File for simple database use. It uses berkley db and ties it to a hash. Here is a quick example.

#Get package by ppm install db_file
use DB_File;

#Decalare varable
my %hash;

#Tie db to hash
tie(%hash, "DB_File", "my.db");

#Add record
$hash{'1'} = "hello";

#Check for existance
if(exists($hash{'1'})) { 
  #Remove record
  delete $hash{'1'}; 
}

#Untie from db
untie %hash;
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Hope this helps.