Hello Monks, Posting my problem again with my piece of code... I have a requirement to compare two large files based on some conditions and create a new file out of those. These two files are two different layouts ( delemited with |), my condition should compare 2nd field of the first file and 5th field of the second and pullout a record from the second file if the IDs matches. Initially I've done this by loading files into two arrays and do a loop on those and filter. But my files are very huge - say 1GB , where each have 10 million records, and my execution ran out of memory. then I tried with Tie::File , but this only saved my memory but not the performance. My process is still running with no signs of ending :) Can someone help me solving this ??? Its urgent and I'm new to Perl.....

Record from File1 :

I|1400000042597061|ACTV|602282|2011-08-29||602178|JUSTIN||MAGRUDER||||||602282|100001|||||Gold||600990|||||||WUSA00029582|529381||||||||||||

Record from File2 :

I|1400000042589325|2011-08-29|ACTV|1400000042597061|600002|||1556 3RD AVE|||NEW YORK|NY|10128|3100|US|||||||

In the above Ex. 2nd field of F1 matches 5th Field of F2 , so this record from F2 will be loaded into an array

And my piece of code

  while(my $pline = <PRFILE>)
  { 
    $parrecord = $pline;
     my @parfields=split('\|',$parrecord);
     chomp(@parfields);
                        
     # Child file is already loaded into @carray
     foreach (@carray)
    {                      
                  $chrecord = $_;
                     @chfields=split('\|',$chrecord);
                     chomp(@chfields);
                     
                     if(@chfields[4] eq @parfields[1])
                          {
                                # Some logic #
                           last ;
                       }
                      
        } 
                    
  }

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In reply to Compare two large files and extract a matching row... by suneel.reddy

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