From 79a471435bbaa2bbe224a211d431bada13d5f5bb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20=C5=A0koda?= <commits@skodak.org>
Date: Mon, 25 Jun 2012 09:31:50 +0200
Subject: [PATCH] MDL-33617 add new index to improve perf of enrol related
 role_assignments

---
 lib/db/install.xml |  3 ++-
 lib/db/upgrade.php | 15 +++++++++++++++
 version.php        |  2 +-
 3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/lib/db/install.xml b/lib/db/install.xml
index 1d88b4d12cc28..22835b232a01b 100644
--- a/lib/db/install.xml
+++ b/lib/db/install.xml
@@ -1130,7 +1130,8 @@
       <INDEXES>
         <INDEX NAME="sortorder" UNIQUE="false" FIELDS="sortorder" NEXT="rolecontext"/>
         <INDEX NAME="rolecontext" UNIQUE="false" FIELDS="roleid, contextid" COMMENT="Index on roleid and contextid" PREVIOUS="sortorder" NEXT="usercontextrole"/>
-        <INDEX NAME="usercontextrole" UNIQUE="false" FIELDS="userid, contextid, roleid" COMMENT="Index on userid, contextid and roleid" PREVIOUS="rolecontext"/>
+        <INDEX NAME="usercontextrole" UNIQUE="false" FIELDS="userid, contextid, roleid" COMMENT="Index on userid, contextid and roleid" PREVIOUS="rolecontext" NEXT="component-itemid-userid"/>
+        <INDEX NAME="component-itemid-userid" UNIQUE="false" FIELDS="component, itemid, userid" PREVIOUS="usercontextrole"/>
       </INDEXES>
     </TABLE>
     <TABLE NAME="role_capabilities" COMMENT="permission has to be signed, overriding a capability for a particular role in a particular context" PREVIOUS="role_assignments" NEXT="role_names">
diff --git a/lib/db/upgrade.php b/lib/db/upgrade.php
index f50ae6b2798ef..1a98860c7fa07 100644
--- a/lib/db/upgrade.php
+++ b/lib/db/upgrade.php
@@ -899,6 +899,21 @@ function xmldb_main_upgrade($oldversion) {
         upgrade_main_savepoint(true, 2012062500.02);
     }
 
+    if ($oldversion < 2012062500.04) {
+
+        // Define index component-itemid-userid (not unique) to be added to role_assignments
+        $table = new xmldb_table('role_assignments');
+        $index = new xmldb_index('component-itemid-userid', XMLDB_INDEX_NOTUNIQUE, array('component', 'itemid', 'userid'));
+
+        // Conditionally launch add index component-itemid-userid
+        if (!$dbman->index_exists($table, $index)) {
+            $dbman->add_index($table, $index);
+        }
+
+        // Main savepoint reached
+        upgrade_main_savepoint(true, 2012062500.04);
+    }
+
 
     return true;
 }
diff --git a/version.php b/version.php
index 0e59d871b3e83..b281bb412c30a 100644
--- a/version.php
+++ b/version.php
@@ -30,7 +30,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 
-$version  = 2012062500.03;              // YYYYMMDD      = weekly release date of this DEV branch
+$version  = 2012062500.04;              // YYYYMMDD      = weekly release date of this DEV branch
                                         //         RR    = release increments - 00 in DEV branches
                                         //           .XX = incremental changes