Probably a paste-o from trimming your real code, but you don't declare or populate %Data anywhere before you loop over its keys. Your stricture would have caught that in running code.

The best opportunity for a speed increase I see is to follow davido's advice and use placeholders. Your UPDATE can be defined once, outside the loop, by saying 

my $usth->'update new_table set newData=? where newID=?';
foreach (keys (%Data)) {
    $usth->execute( $Data{$_}, $_ );
);

[download]
You may get some speed by changing that loop to while ( my ($id, $data) = each %Data) { $usth->execute( $data, $id);}. That could be if %Data is large.

You should check for errors each time you go to the database server. You can ease the pain of that by setting RaiseError=>1 in the connect call.

The biggest source of slowness in DBI is usually just grabbing too much data at once. Refining your demands will help that most.

After Compline,
Zaxo

In reply to Re: How to Speed up MySQL w/ Perl by Zaxo
in thread How to Speed up MySQL w/ Perl by rsiedl

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