Greeting Monks,

I am continually writing perl to amalgamate databases. Specifically, I design code to obtain some verbose data set and compare it to various other data sets in order to update and/or insert this obtained data into these various other data sets. My Question is: can I replace the rudimentary sql record by record update and insert statements with tiehash::db and/or data::dumper or possibly some other module in order to speed up this correlation and reallocation. A dependency worth considering is the fact that the databases being written to are multi-user environments and cannot be locked because they are perpetually in use.

Thanks, 
my $href1 = $dbh->selectall_hashref($sql1 "key");

my $href2 = $dbh2->selectall_hashref($sql2, "key2");

my $href3 = $dbh3->selectall_hashref($sql3, "key3");

foreach (sort(keys(%$href1))) {
   if ((exists($href2->{$_}{key2})) {
     $sql = "UPDATE data_set2";
     $sql .= "set data = $href1->{$_}{data} where key2 = $_";
   }
   else {
     $sql = "insert into data_set2 $href1->{$_}{data}";
   }
   if ((exists($href3->{$_}{key3})) {
     $sql = "UPDATE data_set3";
     $sql .= "set data = $href1->{$_}{data} where key3 = $_";
   }
   else {
     $sql = "insert data_set3 $href1->{$_}{data}";
   }
}

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In reply to PERL DB Optimization by 3dbc

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