Amazon RDS for Oracle now supports the July 2026 Release Update for database versions 19c, 21c, and 26ai. This update includes critical security patches and introduces a new naming convention for 19c RUs. Monthly Critical Security Patch Updates for 19c and 26ai will now be bundled into monthly release patches alongside recommended fixes.
- Upgrade to July 2026 RU for 19c, 21c, and 26ai to receive security patches.
- New 19c RU naming format is <version>.ru-<YYYY-MM>.mrp-<YYYY-MM>.r<N>.
- Monthly CSPUs for 19c/26ai are bundled into MRP versions with extra fixes.
- Oracle Database 21c RUs retain their existing naming convention.
- RDS for Oracle automatically applies these updates to supported versions.
Fleet impact: For Oracle ExaCC/RAC and RDS fleets, verify your 19c version naming conventions match the new <version>.ru-<YYYY-MM>.mrp-<YYYY-MM>.r<N> format to avoid confusion during patching. Ensure your maintenance windows account for the bundling of CSPUs into MRP versions for 19c and 26ai to minimize separate patching overhead.