Major and minor version upgrades
Amazon RDS supports the following upgrades to an Oracle DB instance:
- Major version upgrades
- In general, a major version upgrade for a database engine can introduce changes that aren't compatible with existing applications. To upgrade your DB instance to a major version, you must perform the action manually.
- Minor version upgrades
- A minor version upgrade includes only changes that are backward-compatible with existing applications. If you enable auto minor version upgrades on your DB instance, minor version upgrades occur automatically. In all other cases, you upgrade the DB instance manually.
When you upgrade the DB engine, an outage occurs. The duration of the outage depends on your engine version and instance size.
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Supported versions for major upgrades
Amazon RDS supports the following major version upgrades.
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A major version upgrade of Oracle Database must upgrade to a Release Update (RU) that was released in the same month or later. Major version downgrades aren't supported for any Oracle versions.
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Upgrading the Oracle DB engine - Amazon Relational Database ServiceOracle minor version upgrades
A minor version upgrade applies an Oracle Database Patch Set Update (PSU) or Release Update (RU) in a major version.
An Amazon RDS for Oracle DB instance is scheduled to be upgraded automatically during its next maintenance window when it meets the following conditions:
- The DB instance has the Auto minor version upgrade option enabled.
- The DB instance is not running the latest minor DB engine version.
