Where can I find additional documentation for MySQL 8?
For additional MySQL 8.0 documentation, see the MySQL 8.0 Reference Manual, which includes an overview of features added in MySQL 8.0 ( What Is New in MySQL 8.0 ), and discussion of upgrade issues that you may encounter for upgrades from MySQL 5.7 to MySQL 8.0 ( Changes in MySQL 8.0 ).
Can I downgrade from MySQL 8 to MySQL 5?
Downgrade from MySQL 8.0 to MySQL 5.7, or from a MySQL 8.0 release to a previous MySQL 8.0 release, is not supported. The only supported alternative is to restore a backup taken before upgrading. It is therefore imperative that you back up your data before starting the upgrade process.
Which version of MySQL Connector should I upgrade to?
MySQL Connector/J 8.0 is highly recommended for use with MySQL Server 8.0 and 5.7. Please upgrade to MySQL Connector/J 8.0. For notes detailing the changes in each release of Connector/J 8.0, see MySQL Connector/J 8.0 Release Notes . For legal information, including licensing information, see the Preface and Legal Notices .
What is MySQL Connector/J 8?
This manual describes how to install, configure, and develop database applications using MySQL Connector/J 8.0, a JDBC and X DevAPI driver for communicating with MySQL servers. MySQL Connector/J 8.0 is highly recommended for use with MySQL Server 8.0 and 5.7. Please upgrade to MySQL Connector/J 8.0.