diff -u b/includes/database/mysql/database.inc b/includes/database/mysql/database.inc
--- b/includes/database/mysql/database.inc
+++ b/includes/database/mysql/database.inc
@@ -359,7 +359,7 @@
     );
 
     $sql_mode = 'REAL_AS_FLOAT,PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO';
-    // NO_AUTO_CREATE_USER is removed in MySQL 8.0.11
+    // NO_AUTO_CREATE_USER was removed in MySQL 8.0.11
     // https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-11.html#mysqld-8-0-11-deprecation-removal
     if (version_compare($this->getAttribute(PDO::ATTR_SERVER_VERSION), '8.0.11', '<')) {
       $sql_mode .= ',NO_AUTO_CREATE_USER';
diff -u b/sites/default/default.settings.php b/sites/default/default.settings.php
--- b/sites/default/default.settings.php
+++ b/sites/default/default.settings.php
@@ -261,7 +261,7 @@
  * @see \DatabaseConnection_mysql::setPrefix
  * @see \DatabaseConnection_mysql::quoteIdentifier
  */
-# $conf['mysql_identifier_quote_character'] = '';
+# $conf['mysql_identifier_quote_character'] = '`';
 
 /**
  * Access control for update.php script.