| Who operates the database | AceMQ engineers with partner Oracle specialists, under a contract with a 15-minute emergency response. | Oracle. Its documentation says the service handles provisioning, backups, patching and upgrading, and growing or shrinking the database. | AWS runs the managed instance. You remain responsible for schema, SQL and performance. |
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| Where it runs | Your data centre or cloud account (Tier 3), or infrastructure AceMQ runs (Tier 4). | Oracle's cloud. You manage no hardware or software. | AWS only. |
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| Releases | The release you run today, with Oracle's lifecycle dates planned around. 19c, 21c and 26ai are covered. | Oracle decides when patching and upgrading happen. | 19c, 21c and 26ai. 26ai is Enterprise Edition only, and 21c and 26ai are multitenant-only. |
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| Server and file system access | Yes. AceMQ works with system access to the hosts, inside your change process. | No server for you to manage. | No host file system access. |
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| RAC, ASM and Flashback Database | RAC and Data Guard run where your edition and licences allow them. Exadata is scoped case by case. | The platform design is Oracle's. Check Oracle's documentation for any feature you rely on. | RAC, ASM and Flashback Database are not supported. Read replicas use Active Data Guard, which needs Enterprise Edition and the option licence. |
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| Best when | You have an existing estate, depend on RAC, Data Guard or a specific release, need data to stay in your own boundary, or want one contract across several databases. | You want Oracle to run the platform and your workload fits what the service allows. | You are on AWS, your workload avoids the unsupported features, and you want AWS to run the instance. |
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