Add index and use "force index" in query; drops "more entries" time

from 20 seconds to under 1.

sql/database-create.sql

@@ -3681,7 +3681,8 @@ CREATE TABLE `testbed_stats` (
   KEY `rsrcidx` (`rsrcidx`),
   KEY `exptidx` (`exptidx`),
   KEY `uid_idx` (`uid_idx`),
-  KEY `idxdate` (`end_time`,`idx`)
+  KEY `idxdate` (`end_time`,`idx`),
+  KEY `end_time` (`end_time`)
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1;
 
 --

sql/updates/4/260

+#
+# Add key to testbed_stats
+#
+use strict;
+use libdb;
+
+sub DoUpdate($$$)
+{
+    my ($dbhandle, $dbname, $version) = @_;
+
+    if (!DBKeyExists("testbed_stats", "end_time")) {
+	DBQueryFatal("ALTER TABLE testbed_stats " .
+		     "ADD KEY `end_time` (`end_time`)");
+    }
+    return 0;
+}
+
+1;

www/showstats.php3

@@ -194,7 +194,7 @@ $query_result =
     DBQueryFatal("select t.exptidx,s.pid,s.eid,t.action,t.exitcode,t.uid, ".
                  "       r.pnodes,t.idx as statno,t.start_time,t.end_time, ".
 		 "       s.archive_idx,r.archive_tag,t.uid_idx ".
-		 "  from testbed_stats as t ".
+		 "  from testbed_stats as t force index (end_time, idx) ".
 		 "left join experiment_stats as s on s.exptidx=t.exptidx ".
 		 "left join experiment_resources as r on r.idx=t.rsrcidx ".
 		 "$wclause ".