From: Nitin Kalra <[EMAIL PROTECTED]> > All I want to do is to compare 2 hashes having 10-20 > Million key/ value pairs, this means 100-200 Million > comparisons. Hashes are the best thing which come to > my mind but storing hashes in memory overloads the > system and lowers the performance drastically. > > For this you are suggesting me to use DB_file module, > can you plz elaborate how this can be implemented with > compromising the system performance and having fast > comparisons. > > Many thanks > Nitin
The only change to the script will be use DB_File; somewhere near the top and change my %firsthash; my %secondhash; to tie my %firsthash, 'DB_File', $firstfilename; tie my %secondhash, 'DB_File', $secondfilename; a little later, where the two files should not exist beforehand and should be if possible on a different disk than the milions of files you are comparing. OTOH, are you sure you need to build both %hashes and THEN compare them? I think it should be enough to build one and then as you go through the second batch of files compare the data you just generated with the %hash. Jenda ===== [EMAIL PROTECTED] === http://Jenda.Krynicky.cz ===== When it comes to wine, women and song, wizards are allowed to get drunk and croon as much as they like. -- Terry Pratchett in Sourcery -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
