Amazon RDS for Oracle now offers the July 2026 Release Update for versions 19c, 21c, and 26ai, including critical security patches. For Oracle 19c, the RU naming convention has shifted to a new format that explicitly denotes the release and maintenance patch release dates. Oracle 21c continues to use its existing naming structure for RUs.
- July 2026 RU is available for Oracle 19c, 21c, and 26ai on RDS.
- 19c RU naming changed to <version>.ru-<YYYY-MM>.mrp-<YYYY-MM>.r<N> format.
- 21c RUs retain their original naming convention without changes.
- Monthly CSPUs for 19c and 26ai will be bundled as MRP versions.
- Upgrade recommended to apply included security updates immediately.
Fleet impact: Update Oracle 19c instances to the new July 2026 RU to align with the new naming scheme and apply security fixes. Verify that automation scripts parsing the version string are updated to handle the new <version>.ru-<YYYY-MM>.mrp-<YYYY-MM>.r<N> format to prevent deployment failures.