From 00a51457f4fe4195c4a3b2ffaacc0e9fc5b609e9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pau=20Ferrer=20Oca=C3=B1a?= <crazyserver@gmail.com>
Date: Wed, 23 Sep 2015 17:02:39 +0200
Subject: [PATCH] MDL-50805 Messages: Add index to message_read to speed up
 message crons

---
 lib/db/install.xml |  1 +
 lib/db/upgrade.php | 15 +++++++++++++++
 version.php        |  2 +-
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/lib/db/install.xml b/lib/db/install.xml
index fcc226d84d2..7c8e07d61e2 100644
--- a/lib/db/install.xml
+++ b/lib/db/install.xml
@@ -565,6 +565,7 @@
       <INDEXES>
         <INDEX NAME="useridto" UNIQUE="false" FIELDS="useridto"/>
         <INDEX NAME="useridfromto" UNIQUE="false" FIELDS="useridfrom, useridto"/>
+        <INDEX NAME="notificationtimeread" UNIQUE="false" FIELDS="notification, timeread"/>
       </INDEXES>
     </TABLE>
     <TABLE NAME="message_contacts" COMMENT="Maintains lists of relationships between users">
diff --git a/lib/db/upgrade.php b/lib/db/upgrade.php
index 319524d3ac0..79fba742023 100644
--- a/lib/db/upgrade.php
+++ b/lib/db/upgrade.php
@@ -4455,5 +4455,20 @@ function xmldb_main_upgrade($oldversion) {
         upgrade_main_savepoint(true, 2015051101.07);
     }
 
+    if ($oldversion < 2015051102.03) {
+
+        // Define index notification (not unique) to be added to message_read.
+        $table = new xmldb_table('message_read');
+        $index = new xmldb_index('notificationtimeread', XMLDB_INDEX_NOTUNIQUE, array('notification', 'timeread'));
+
+        // Conditionally launch add index notification.
+        if (!$dbman->index_exists($table, $index)) {
+            $dbman->add_index($table, $index);
+        }
+
+        // Main savepoint reached.
+        upgrade_main_savepoint(true, 2015051102.03);
+    }
+
     return true;
 }
diff --git a/version.php b/version.php
index 7d31941a332..83216e37435 100644
--- a/version.php
+++ b/version.php
@@ -29,7 +29,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$version  = 2015051102.02;              // 20150511      = branching date YYYYMMDD - do not modify!
+$version  = 2015051102.03;              // 20150511      = branching date YYYYMMDD - do not modify!
                                         //         RR    = release increments - 00 in DEV branches.
                                         //           .XX = incremental changes.