diff --git a/core/lib/Drupal/Core/Database/Database.php b/core/lib/Drupal/Core/Database/Database.php
old mode 100644
new mode 100755
index d13ea80..40c5197
--- a/core/lib/Drupal/Core/Database/Database.php
+++ b/core/lib/Drupal/Core/Database/Database.php
@@ -365,6 +365,8 @@
       throw new DriverNotSpecifiedException('Driver not specified for this database connection: ' . $key);
     }
 
+    // @todo https://www.drupal.org/project/drupal/issues/3115388
+    // Remove use of the deprecated getDatabaseDriverNamespace  in Drupal 9.1.0.
     $namespace = static::getDatabaseDriverNamespace(self::$databaseInfo[$key][$target]);
     $driver_class = $namespace . '\\Connection';
 
@@ -488,6 +490,8 @@ public static function getConnectionInfoAsUrl($key = 'default') {
     if (empty($db_info) || empty($db_info['default'])) {
       throw new \RuntimeException("Database connection $key not defined or missing the 'default' settings");
     }
+    // @todo https://www.drupal.org/project/drupal/issues/3115388
+    // Remove use of the deprecated getDatabaseDriverNamespace  in Drupal 9.1.0.
     $connection_class = static::getDatabaseDriverNamespace($db_info['default']) . '\\Connection';
     return $connection_class::createUrlFromConnectionOptions($db_info['default']);
   }
@@ -502,8 +506,13 @@ public static function getConnectionInfoAsUrl($key = 'default') {
    *
    * @return string
    *   The PHP namespace of the driver's database.
+   *
+   * @deprecated in drupal:9.0.0 and is removed from drupal:10.0.0.
+   * $info['namespace] is always set now.
+   * @see https://www.drupal.org/project/drupal/issues/3112476.
    */
   protected static function getDatabaseDriverNamespace(array $connection_info) {
+    @trigger_error("getDatabaseDriverNamespace() is deprecated in drupal:9.1.0 and is removed from drupal:10.0.0. $info['namespace'] is always set now. See https://www.drupal.org/project/drupal/issues/3115388.", E_USER_DEPRECATED);
     if (isset($connection_info['namespace'])) {
       return $connection_info['namespace'];
     }