diff --git a/config/app.php.txt b/config/app.php.txt
index b9bd33a..5f372e6 100644
--- a/config/app.php.txt
+++ b/config/app.php.txt
@@ -384,6 +384,13 @@ define('CLEAN_PAGE_BAN_SECONDS_OFFSET', 60*60*24*30);
  */
 define('CLEAN_PAGE_DESCRIPTION_OFFSET', 60*60*24*30*12*10);
 
+/*
+ * Run database tables optimization
+ *
+ * When enabled - may reduce disk space usage but requires enough of RAM
+ *
+ */
+define('CLEAN_DB_TABLES_OPTIMIZATION', true);
 
 // API settings
 
diff --git a/crontab/cleaner.php b/crontab/cleaner.php
index e2ac895..9e0f347 100644
--- a/crontab/cleaner.php
+++ b/crontab/cleaner.php
@@ -253,7 +253,10 @@ try {
   $db->commit();
 
   // Optimize tables
-  $db->optimize();
+  if (CLEAN_DB_TABLES_OPTIMIZATION) {
+
+    $db->optimize();
+  }
 
 } catch(Exception $e) {