X-Git-Url: http://www.git.stargrave.org/?a=blobdiff_plain;f=lib%2FPublicInbox%2FMsgmap.pm;h=feef8ba79ab9a657d8135b0c65ca0186dd7bed51;hb=74b92712fa7a21fe504b9908edebcf11bb9dc170;hp=f5f88431bbfa82d1e7af847126d14441f6409864;hpb=5e8be4aa1e6adb321e2b85f8f96ad1e2646c093a;p=public-inbox.git

diff --git a/lib/PublicInbox/Msgmap.pm b/lib/PublicInbox/Msgmap.pm
index f5f88431..feef8ba7 100644
--- a/lib/PublicInbox/Msgmap.pm
+++ b/lib/PublicInbox/Msgmap.pm
@@ -138,10 +138,14 @@ sub num_for {
 sub minmax {
 	my ($self) = @_;
 	my $dbh = $self->{dbh};
-	my $sth = $self->{num_minmax} ||=
-		$dbh->prepare('SELECT MIN(num),MAX(num) FROM msgmap');
+	# breaking MIN and MAX into separate queries speeds up from 250ms
+	# to around 700us with 2.7million messages.
+	my $sth = $dbh->prepare_cached('SELECT MIN(num) FROM msgmap', undef, 1);
 	$sth->execute;
-        $sth->fetchrow_array;
+	my $min = $sth->fetchrow_array;
+	$sth = $dbh->prepare_cached('SELECT MAX(num) FROM msgmap', undef, 1);
+	$sth->execute;
+	($min, $sth->fetchrow_array);
 }
 
 sub mid_prefixes {