🔹 RDS for Oracle (standard)
- Fully managed by AWS.
- No OS access (you cannot log in to the host).
- AWS controls patching, upgrades, backups, monitoring.
- Limited to the Oracle features that AWS supports.
- Best if you want low operational overhead and don’t need customizations.
🔹 RDS Custom for Oracle
- Managed service + OS access.
- AWS still automates many things (backups, monitoring, scaling).
- But you also get root/SSH access to the underlying OS.
- You can install third-party agents, configure OS-level settings, or use Oracle features that standard RDS doesn’t allow.
- Best if you want reduced operational overhead but still need customization.
🔹 EC2 with Oracle (self-managed)
- You install and manage everything yourself.
- Full OS and DB access.
- No automation from AWS (you handle backups, monitoring, patching).
- Maximum flexibility but maximum operational burden.
✅ So: RDS Custom for Oracle is not the same as standard RDS for Oracle.
It was created because many Oracle customers told AWS: “We like RDS automation, but we need to touch the OS sometimes.”
AWS’s answer: RDS Custom.
👉 Quick analogy:
- RDS (standard) = Hotel room (everything managed, no access to back office).
- RDS Custom = Serviced apartment (some services provided, but you also have keys to customize).
- EC2 = Empty land (build and manage everything yourself).
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