How do I view the version number of an RDS for MySQL Instance?
• You can go to the Instance Management page on the Console, click the instance name to go to the Instance Details page, and check version number of the Database Engine field.
• Log in to the database and execute the following SQL command to view the database version: select @@version;.
Does RDS for MySQL support version upgrades?
RDS for MySQL supports upgrading the database version and the minor kernel version.
For details about how to upgrade the database version, see Instance Management-Upgrading the Database Version.
For details about how to upgrade the minor kernel version, see Instance Management-Upgrading the Database Minor Kernel Version.
Does RDS for MySQL support version downgrades?
Sorry, RDS for MySQL does not support version downgrades.
If you need to downgrade an instance of MySQL 8.0 to an instance of MySQL5.7, you can recreate an instance of V5.7 and use mysqldump to migrate the data to the new instance. For details, see Data Migration-Migrating Data to MySQL Using mysqldump.