Hi Monks, I have two questions and I'd appreciate any sample code to solve it. I've used to store a large hash in the memory and since it is large I had to have more than 20-30 GB of ram to do it. Since I could access it I was running my code in this way. Now I want to convert my hash into database in the physical disc and then access it using sql/mysql queries whenever I want. I have this code to read my hash: 
sub read_dict{
my $file=$_[0];
my $p=$_[1];
my $direction=$_[2];
my %dict1;
open( FILE, "gunzip -c $file |") or die $!;

# for each line of input file
while (<FILE>)
{

   chomp;
   local ($l1, $l2, $pr) = split /\|\|\|/;
   chomp ($l1, $l2,$pr);
   my @pr = split (/\s/,$pr);
   chomp $pr[1];
     
   if ($direction) {
   
    if ($pr[3]>=$p) {
     
    $l1 =~ s/[[:punct:]]//g; $l1 =~ s/\s+/ /g;
    $l2 =~ s/[[:punct:]]//g; $l2 =~ s/\s+/ /g;
    $l2 =~ s/^\s+//; $l2 =~ s/\s+$//;
    $l1 =~ s/^\s+//; $l1 =~ s/\s+$//;
    chomp ($l1, $l2);
     
    if ($l2 && $l1) {
    push( @{$dict1{lc($l1)}}, lc($l2) );}

}}
   
   else {
   if ($pr[1]>=$p) {
    $l1 =~ s/[[:punct:]]//g; $l1 =~ s/\s+/ /g;
    $l2 =~ s/[[:punct:]]//g; $l2 =~ s/\s+/ /g;
    $l2 =~ s/^\s+//; $l2 =~ s/\s+$//;
    $l1 =~ s/^\s+//; $l1 =~ s/\s+$//;
    chomp ($l1, $l2);
    if ($l2 && $l1) {
    push( @{$dict1{lc($l2)}}, lc($l1) );}
     
}}
}
# return the hash of arrays!!!
return \%dict1;
}

[download]
This was the first part of the problem that I would like to store the hash line by line possibly in a database. Since, I'm not familiar with databases, you sample code would really help me.
Regarding the access to the hash I have such codes : 
if (grep {$_ eq $string} @uniq_strings) { $match++ ; }
    
    #using hash
    elsif (exists $dict{$string}) {
        # loop over all elements in array of hash
        LOOP: foreach $element (@{$dict{$string}}) {
              if (grep {$_ eq $element} @uniq_strings) {
                    $match++ ;
                    last LOOP;
                 }
        }
    }

[download]
Si I want to convert the dict search from hash to SQL format since it is the way to access database. I'd appreciate your helps.

In reply to storing a large hash in a database by Anonymous Monk

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