Upgrading Database Engine Versions
When Amazon Relational Database Service (Amazon RDS) supports a new version of a database engine, you can upgrade your DB instances to the new version. There are two kinds of upgrades: major version upgrades and minor version upgrades.
Major version upgrades can contain database changes that are not backward-compatible with previous versions of the database. This functionality can cause your existing applications to stop working correctly. As a result, Amazon RDS doesn't apply major version upgrades automatically; you must modify your DB instance manually to perform a major version upgrade. You should thoroughly test any upgrade to verify that your applications work correctly before applying the upgrade to your production DB instances. For more information about major version upgrades, see the documentation for your DB engine listed following.
Minor version upgrades usually contain database changes that are backward-compatible with the previous version of the database. As a result, Amazon RDS might apply a minor version upgrade automatically in some cases. For more information about minor version upgrades, see the documentation for your DB engine listed following.
For more information about major and minor version upgrades, see the following documentation for your DB engine: