From f9ce68ee7ff91225ce6a4ec0418498deeb4c9cb2 Mon Sep 17 00:00:00 2001
From: moodler <moodler>
Date: Sun, 27 Apr 2003 02:58:26 +0000
Subject: [PATCH] Using multiple indexes for slightly increased performance

---
 lib/db/mysql.php | 16 +++++++++++++---
 lib/db/mysql.sql |  6 ++----
 version.php      |  2 +-
 3 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/lib/db/mysql.php b/lib/db/mysql.php
index 834a793c0d..d5573066ce 100644
--- a/lib/db/mysql.php
+++ b/lib/db/mysql.php
@@ -348,9 +348,19 @@ function main_upgrade($oldversion=0) {
     }
 
     if ($oldversion < 2003042600) {
-        /// Some more indexes - we need al the help we can get on the logs
-        execute_sql(" ALTER TABLE `{$CFG->prefix}log` ADD INDEX(module) ");
-        execute_sql(" ALTER TABLE `{$CFG->prefix}log` ADD INDEX(action) ");
+        /// Some more indexes - we need all the help we can get on the logs
+        //execute_sql(" ALTER TABLE `{$CFG->prefix}log` ADD INDEX(module) ");
+        //execute_sql(" ALTER TABLE `{$CFG->prefix}log` ADD INDEX(action) ");
+    }
+
+    if ($oldversion < 2003042700) {
+        /// Changing to multiple indexes
+        execute_sql(" ALTER TABLE `{$CFG->prefix}log` DROP INDEX module ", false);
+        execute_sql(" ALTER TABLE `{$CFG->prefix}log` DROP INDEX action ", false);
+        execute_sql(" ALTER TABLE `{$CFG->prefix}log` DROP INDEX course ", false);
+        execute_sql(" ALTER TABLE `{$CFG->prefix}log` DROP INDEX userid ", false);
+        execute_sql(" ALTER TABLE `{$CFG->prefix}log` ADD INDEX coursemoduleaction (course,module,action) ");
+        execute_sql(" ALTER TABLE `{$CFG->prefix}log` ADD INDEX courseuserid (course,userid) ");
     }
 
     return $result;
diff --git a/lib/db/mysql.sql b/lib/db/mysql.sql
index f7a5e4ba01..06f1434d69 100644
--- a/lib/db/mysql.sql
+++ b/lib/db/mysql.sql
@@ -112,10 +112,8 @@ CREATE TABLE `prefix_log` (
   `url` varchar(100) NOT NULL default '',
   `info` varchar(255) NOT NULL default '',
   PRIMARY KEY  (`id`),
-  KEY `course` (`course`),
-  KEY `userid` (`userid`),
-  KEY `module` (`module`),
-  KEY `action` (`action`)
+  KEY `coursemoduleaction` (course,module,action),
+  KEY `courseuserid` (course,userid)
 ) TYPE=MyISAM COMMENT='Every action is logged as far as possible.';
 # --------------------------------------------------------
 
diff --git a/version.php b/version.php
index 754883c33b..06a6e187bc 100644
--- a/version.php
+++ b/version.php
@@ -5,7 +5,7 @@
 // database to determine whether upgrades should
 // be performed (see lib/db/*.php)
 
-$version = 2003042600;   // The current version is a date (YYYYMMDDXX)
+$version = 2003042700;   // The current version is a date (YYYYMMDDXX)
 
 $release = "1.0.9 development";  // User-friendly version number
 
-- 
2.39.5