Amazon RDS for Oracle now supports the July 2026 Release Update across versions 19c, 21c, and 26ai, prioritizing security patches. For Oracle 19c, the RU naming convention has shifted to a new format that explicitly denotes the monthly recommended patch (MRP) cycle. Future monthly Critical Security Patch Updates for 19c and 26ai will be bundled into MRP versions that combine security fixes with additional Oracle-recommended patches.
- Upgrade to July 2026 RU for critical security patches on 19c, 21c, and 26ai.
- Note the new 19c RU naming format: <version>.ru-<YYYY-MM>.mrp-<YYYY-MM>.r<N>.
- Monthly CSPUs for 19c and 26ai are now delivered as MRP versions with extra fixes.
- 21c RUs retain their existing naming structure and do not use the new format.
- Plan maintenance windows to apply the new MRP-bundled updates for 19c/26ai.
Fleet impact: For Oracle ExaCC/RAC and RDS Oracle fleets, verify that your CI/CD or patching scripts can parse the new 19c RU naming convention (ru-YYYY-MM.mrp-YYYY-MM.rN). The July 2026 RU bundles monthly CSPUs with additional fixes, so applying it addresses both immediate security gaps and recommended stability patches in a single step, simplifying the patching cadence for 19c and 26ai instances.