Hello. I've "inherited" a problem with an application. It makes use of perl-DBI and MySQL. On RHEL 4 and 5, the code executes at a sufficient speed. However, on RHEL6, it takes much longer. RHEL 4 & 5 < 10 sec; RHEL 6 > 45 seconds. In regards to hardware, the RHEL6 machine should be faster. Any help would be greatly appreciated. Here is part of the code... FYI, the MySQl db is located on the same machine so the connections are being made to localhost

my $dbh = $me->{DBHANDLE};
my %labels;


  # Get all the different ids
  my $sql = 'SELECT DISTINCT id FROM list_index ';
  my $sth = $dbh->prepare($sql);
  $sth->execute;

  my $prev;

  while( my $hashref = $sth->fetchrow_hashref) {
  
    #keep only the latest description
    #more than one description will exist, the hash will only keep one
+ key but it will be the oldest one
    # Get the last occurance's description
    my $sql2 = 'select  id,description  from list_index  where id = "'
+. $hashref->{id} . '" order by rpt_key desc limit 1';

    my $sth2 = $dbh->prepare($sql2);
    $sth2->execute;
    while( my $hashref2 = $sth2->fetchrow_hashref) {
        $labels{$hashref2->{id}} =  $hashref2->{id} . ' - ' . $hashref
+2->{description};
    }

    $sth2->finish;
  }
  $sth->finish;
  

  return \%labels;

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In reply to Much slower DBI on RHEL6 by MPM

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