From f51d4c32cd8bed69d2f6b0c50424280613c68496 Mon Sep 17 00:00:00 2001 From: Florian Pritz Date: Wed, 21 Feb 2018 15:49:05 +0100 Subject: Remove disjunction in pkg_providers query For some reason, running the SELECT .. WHERE .. OR .. query takes e.g. 58ms on a randomly generated db for some dependency name. Splitting the OR into two dedicated queries and UNIONing the result takes only 0.42ms. On the Arch Linux installation, searching for the providers of e.g. mongodb takes >=110ms when not cached by the query cache. The new query takes <1ms even when not cached. Signed-off-by: Florian Pritz Signed-off-by: Lukas Fleischer --- web/lib/pkgfuncs.inc.php | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/web/lib/pkgfuncs.inc.php b/web/lib/pkgfuncs.inc.php index d022ebe5..ad254746 100644 --- a/web/lib/pkgfuncs.inc.php +++ b/web/lib/pkgfuncs.inc.php @@ -212,10 +212,12 @@ function pkg_groups($pkgid) { function pkg_providers($name) { $dbh = DB::connect(); $q = "SELECT p.ID, p.Name FROM Packages p "; + $q.= "WHERE p.Name = " . $dbh->quote($name) . " "; + $q.= "UNION "; + $q.= "SELECT p.ID, p.Name FROM Packages p "; $q.= "LEFT JOIN PackageRelations pr ON pr.PackageID = p.ID "; $q.= "LEFT JOIN RelationTypes rt ON rt.ID = pr.RelTypeID "; - $q.= "WHERE p.Name = " . $dbh->quote($name) . " "; - $q.= "OR (rt.Name = 'provides' "; + $q.= "WHERE (rt.Name = 'provides' "; $q.= "AND pr.RelName = " . $dbh->quote($name) . ")"; $q.= "UNION "; $q.= "SELECT 0, Name FROM OfficialProviders "; -- cgit v1.2.3-24-g4f1b