diff --git a/apachesolr.module b/apachesolr.module
index 4eab45f..c202d11 100644
--- a/apachesolr.module
+++ b/apachesolr.module
@@ -547,20 +547,37 @@ function apachesolr_mark_entity($entity_type, $entity_id) {
 
 /**
  * Implements of hook_user().
- *
  * Mark nodes as needing re-indexing if the author name changes.
- * @todo performance issue. see http://drupal.org/node/592522
+ *
+ * @see http://drupal.org/node/592522
+ *   Performance issue with Mysql
+ * @see http://api.drupal.org/api/drupal/includes--database--database.inc/function/db_update/7#comment-15459
+ *   To know why PDO in drupal does not support UPDATE and JOIN at once.
  */
 function apachesolr_user($op, &$edit, &$account) {
   switch ($op) {
     case 'update':
       if (isset($edit['name']) && $account->name != $edit['name']) {
         $table = apachesolr_get_indexer_table('node');
-        $entity_ids = db_select('node')->fields('node', array('nid'))->where("uid = :uid", array(':uid' => $account->uid));
-        db_update($table)
-          ->condition('entity_id', $entity_ids, 'IN')
-          ->fields(array('changed' => APACHESOLR_REQUEST_TIME))
-          ->execute();
+        switch (db_driver()) {
+          case 'mysql' :
+            $table = db_escape_table($table);
+            $query = "UPDATE {{$table}} asn
+              INNER JOIN {node} n ON asn.entity_id = n.nid SET asn.changed = :changed
+              WHERE n.uid = :uid";
+            $result = db_query($query, array(':changed' => APACHESOLR_REQUEST_TIME,
+              ':uid' => $account->uid,
+            ));
+            break;
+          default :
+            $nids = db_select('node')
+              ->fields('node', array('nid'))
+              ->where("uid = :uid", array(':uid' => $account->uid));
+            $update = db_update($table)
+              ->condition('nid', $nids, 'IN')
+              ->fields(array('changed' => APACHESOLR_REQUEST_TIME))
+              ->execute();
+        }
       }
       break;
   }
@@ -570,17 +587,35 @@ function apachesolr_user($op, &$edit, &$account) {
  * Implements hook_taxonomy().
  *
  * Mark nodes as needing re-indexing if a term name changes.
- * @todo performance issue. see http://drupal.org/node/592522
+ *
+ * @see http://drupal.org/node/592522
+ *   Performance issue with Mysql
+ * @see http://api.drupal.org/api/drupal/includes--database--database.inc/function/db_update/7#comment-15459
+ *   To know why PDO in drupal does not support UPDATE and JOIN at once.
  * @todo the rest, such as term deletion.
  */
 function apachesolr_taxonomy($op, $type, $edit) {
   if ($type == 'term' && ($op == 'update')) {
     $table = apachesolr_get_indexer_table('node');
-    $entity_ids = db_select('taxonomy_index')->fields('taxonomy_index', array('nid'))->where("tid = :tid", array(':tid' => $edit['tid']));
-    db_update($table)
-      ->condition('nid', $entity_ids, 'IN')
-      ->fields(array('changed' => APACHESOLR_REQUEST_TIME))
-      ->execute();
+      switch (db_driver()) {
+      case 'mysql' :
+        $table = db_escape_table($table);
+        $query = "UPDATE {{$table}} asn
+          INNER JOIN {taxonomy_index} ti ON asn.entity_id = ti.nid SET asn.changed = :changed
+          WHERE ti.tid = :tid";
+        $result = db_query($query, array(':changed' => APACHESOLR_REQUEST_TIME,
+          ':tid' => $term->tid,
+        ));
+        break;
+      default :
+        $nids = db_select('taxonomy_index')
+          ->fields('taxonomy_index', array('nid'))
+          ->where("tid = :tid", array(':tid' => $term->tid));
+        $update = db_update($table)
+          ->condition('nid', $nids, 'IN')
+          ->fields(array('changed' => APACHESOLR_REQUEST_TIME))
+          ->execute();
+    }
   }
   // TODO: the rest, such as term deletion.
 }
@@ -611,6 +646,11 @@ function apachesolr_comment($edit, $op) {
  * Implements hook_node_type().
  *
  * Mark nodes as needing re-indexing if a node type name changes.
+ *
+ * @see http://drupal.org/node/592522
+ *   Performance issue with Mysql
+ * @see http://api.drupal.org/api/drupal/includes--database--database.inc/function/db_update/7#comment-15459
+ *   To know why PDO in drupal does not support UPDATE and JOIN at once.
  */
 function apachesolr_node_type($op, $info) {
   module_load_include('inc', 'apachesolr', 'apachesolr.index');
@@ -624,10 +664,26 @@ function apachesolr_node_type($op, $info) {
       ->fields('node', array('nid'))
       ->where("type = :new OR type = :old", array(':new' => $info->type, ':old' => $info->old_type));
     $table = apachesolr_get_indexer_table('node');
-    db_update($table)
-      ->condition('entity_id', $entity_ids, 'IN')
-      ->fields(array('changed' => APACHESOLR_REQUEST_TIME))
-      ->execute();
+    switch (db_driver()) {
+      case 'mysql' :
+        $table = db_escape_table($table);
+        $query = "UPDATE {{$table}} asn
+          INNER JOIN {node} n ON asn.entity_id = n.nid SET asn.changed = :changed
+          WHERE (n.type = :type OR n.type = :old_type)";
+        $result = db_query($query, array(':changed' => REQUEST_TIME,
+          ':type' => $info->type,
+          ':old_type' => $info->old_type,
+        ));
+        break;
+      default :
+        $nids = db_select('node')
+          ->fields('node', array('nid'))
+          ->where("type = :new OR type = :old", array(':new' => $info->type, ':old' => $info->old_type));
+        $update = db_update($table)
+          ->condition('nid', $nids, 'IN')
+          ->fields(array('changed' => REQUEST_TIME))
+          ->execute();
+    }
   }
 }