Monks, after doing all recommended changes I was able to process 3,000 records per second (for a total of 259,200,000 records a day). All changes had some positive effect, but the one that had the most dramatic effect was moving to Geo::IP. As it was mentioned on the thread by a few of you guys, the relational database was certainly not the correct place to do this operation. The finalized code looks like this now: 
sub Obtain_GeoIP {
        $GeoIP_resolved++;
        my ($IP) = @_;
        if($IP=~/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/ &&(($1<
+=255  && $2<=255 && $3<=255  &&$4<=255 )))
        {
        my @sip = split(/\./,$IP);
        if (($sip[0] == "10") || ($sip[0] == "192" && $sip[1] == "168"
+) || (($sip[0] == "172" && $sip[1] >= "16") && ($sip[0] == "172" && $
+sip[1] <= "31")))
        {
                return "Internal Network";
        } else {
                if ( exists $geoip_hash{IP} ) { my $country_hash = $ge
+oip_hash{IP}; return $country_hash; }
                my $country = $gi->country_name_by_addr($IP);
                $geoip_hash{$IP} = $country;
                return $country;
        }
        } else {
                print EFILE "IP address sent to Obtain_GeoIP routine w
+as incorrect: $IP - $counter\n";
        }
}

[download]
Thank you very much for everybody's help!

In reply to Re^3: Slow response on DBI MySQL query by Fortificus
in thread Slow response on DBI MySQL query by Fortificus

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