DBaaS Decision Criteria

RDS vs self-hosted.

Overview

The DBaaS decision is between managed databases (RDS, Cloud SQL, Atlas) and self-hosted (running Postgres or MySQL on your own VMs). Managed trades a per-instance premium for reduced operational burden: patching, backups, replication, and failover all become someone else’s problem. Self-hosted trades operational work for full control: custom extensions, custom tuning, and the freedom to do anything the engine supports. The right answer depends on the team’s operational maturity and on whether the workload genuinely needs control beyond what managed offers.

• RDS vs self-hosted. Managed reduces ops burden; self-hosted gives control; the choice matches the team’s operational maturity.
• Managed: reduced operational burden. Patching, backups, replication, failover automated; the right default for small teams.
• Self-hosted: full control. Custom extensions, custom tuning, custom hardware; the right answer when managed cannot meet the requirement.
• Cost differs plus hybrid possible. Managed has visible premium; self-hosted has hidden operational cost; hybrid (managed for production, self-hosted for analytics) often makes sense.

The approach

The practical approach is managed by default for most workloads (the operational savings usually exceed the price premium), self-hosted only when justified by genuine control requirements (extensions managed does not support, custom tuning, custom hardware), hybrid where the workload mix demands it, total-cost analysis that includes operational hours, and per-database documented rationale committed to the infrastructure repo.

• Managed default. Most workloads benefit from managed; the operational savings exceed the premium.
• Self-host when justified. Custom extensions, custom hardware, custom tuning that managed does not support; the requirement is real.
• Hybrid for diverse workloads. Managed for production transactional, self-hosted for analytics or specialized workloads.
• Total cost analysis plus documented choice. Include operational hours in the self-hosted total; per-database rationale committed to the infrastructure repo.

Why this compounds

The DBaaS decision compounds across years. Each correct choice produces ongoing operational fit; each wrong choice locks the team into expensive migration; the team builds intuition for which workloads belong on managed versus self-hosted that pays off on every new database.

• Operational fit. Right management for the workload; the team operates at the complexity the workload actually demands.
• Cost efficiency. Right model for the budget; the bill tracks the actual operational shape rather than over-paying for either the premium or the engineering time.
• Reduced switching cost. Right choice up front avoids the painful migration year three when the wrong choice runs out of headroom.
• Institutional knowledge. Each decision teaches database patterns; the team learns when managed pays off and when control matters.

The DBaaS decision is an infrastructure discipline that pays off across years. Nova AI Ops integrates with database telemetry, surfaces operational patterns, and supports the team’s database engineering discipline.