Let the DBI cache your handles
	l Sometimes it's not easy to hold all your handles – e.g., library code to lookup values from the database given a $dbh l The prepare_cached() method gives you a client side statement handle cache:   while ( ($field, $value) = each %search_fields ) {       push @sql,   "$field = ?";       push @values, $value;   }   $where = "";   $where = "where ".join(" and ", @sql) if @sql;   $sth = $dbh->prepare_cached("select * from table $where");   $sth->execute(@values); l Can avoid the need for global statement handle variables
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