#301362 by moshe weitzman, David Strauss, Narayan Newton, and chx: Default to InnoDB in MySQL.

CHANGELOG.txt

@@ -8,6 +8,8 @@ Drupal 7.0, xxxx-xx-xx (development version)
     * Support for master/slave replication, transactions, multi-insert queries,
       delayed inserts, and other features.
     * Added support for the SQLite database engine.
+    * Default to InnoDB engine, rather than MyISAM, on MySQL when available.
+      This offers increased scalability and data integrity.
 - Security:
     * Protected cron.php -- cron will only run if the proper key is provided.
     * Implemented much stronger password hashes that are also compatible with the

INSTALL.mysql.txt

@@ -38,3 +38,6 @@ If successful, MySQL will reply with:
 
   Query OK, 0 rows affected
 
+If the InnoDB storage engine is available, it will be used for all database
+tables. InnoDB provides features over MyISAM such as transaction support,
+row-level locks, and consistent non-locking reads.

includes/database/mysql/schema.inc

@@ -59,9 +59,11 @@ protected function buildTableNameCondition($table_name, $operator = '=') {
    *   An array of SQL statements to create the table.
    */
   protected function createTableSql($name, $table) {
-    if (empty($table['mysql_suffix'])) {
-      $table['mysql_suffix'] = 'DEFAULT CHARACTER SET UTF8';
-    }
+    // Provide some defaults if needed
+    $table += array(
+      'mysql_engine' => 'InnoDB',
+      'mysql_character_set' => 'UTF8',
+    );
 
     $sql = "CREATE TABLE {" . $name . "} (\n";
 
@@ -79,7 +81,7 @@ protected function createTableSql($name, $table) {
     // Remove the last comma and space.
     $sql = substr($sql, 0, -3) . "\n) ";
 
-    $sql .= $table['mysql_suffix'];
+    $sql .= 'ENGINE = ' . $table['mysql_engine'] . ' DEFAULT CHARACTER SET ' . $table['mysql_character_set'];
 
     // Add table comment.
     if (!empty($table['description'])) {