- Patch #42463: performance improvement: add index on the source field of the locale table.

modules/locale/locale.install

@@ -19,7 +19,8 @@ function locale_install() {
         lid int NOT NULL auto_increment,
         location varchar(255) NOT NULL default '',
         source blob NOT NULL,
-        PRIMARY KEY (lid)
+        PRIMARY KEY (lid),
+        KEY source (source(30))
       ) /*!40100 DEFAULT CHARACTER SET UTF8 */ ");
 
       db_query("CREATE TABLE {locales_target} (
@@ -63,6 +64,7 @@ function locale_install() {
       db_query("CREATE INDEX {locales_target}_locale_idx ON {locales_target} (locale)");
       db_query("CREATE INDEX {locales_target}_plid_idx ON {locales_target} (plid)");
       db_query("CREATE INDEX {locales_target}_plural_idx ON {locales_target} (plural)");
+      db_query("CREATE INDEX {locales_source}_source_idx ON {locales_source} (source)");
       break;
   }
   db_query("INSERT INTO {locales_meta} (locale, name, enabled, isdefault) VALUES ('en', 'English', '1', '1')");

modules/system/system.install

@@ -3090,6 +3090,23 @@ function system_update_1007() {
   return $ret;
 }
 
+/**
+ * Performance update for queries that are related to the locale.module
+ */
+function system_update_1008() {
+  $ret = array();
+  switch ($GLOBALS['db_type']) {
+    case 'mysql':
+    case 'mysqli':
+      $ret[] = update_sql('ALTER TABLE {locales_source} ADD KEY source (source(30))');
+      break;
+    case 'pgsql':
+      $ret[] = update_sql("CREATE INDEX {locales_source}_source_idx on {locales_source} (source)");
+  }
+
+  return $ret;
+}
+
 /**
  * @} End of "defgroup updates-4.7-to-x.x"
  * The next series of updates should start at 2000.