自己ホスト vs マネージドデータベース
素のコンピュートがマネージドの利便性に勝つとき、所有のコストとは。
概要とクイックアンサー
マネージドDBサービスは生のコンピュートコストの数倍で利便性を売ります。適切にサイジングしたサーバーでPostgreSQLやMySQLを自己ホストすれば、運用責任と引き換えにその差額の大半を取り戻せます。
レビュー日
2026-08-22
The managed markup
A managed instance with the same vCPU and RAM as a commodity VM routinely costs 2-4x more once storage, backups, and high availability are itemized. The premium purchases automation, not hardware.
What self-hosting really requires
You own provisioning, monitoring, backup verification, failover drills, and security patching. Automated WAL archiving to object storage plus tested restores cover most small-team risk profiles.
RAM is the database spec that matters
Database performance tracks the working set held in memory. Size RAM generously before adding vCPUs; memory-optimized instances are usually the better spend.
A middle path
Many teams self-host primary databases on NVMe-backed VPS providers and keep managed services for exotic needs (global replication, serverless scaling). Compare both options against actual requirements rather than defaults.
要点
- Managed databases commonly cost 2-4x equivalent raw compute.
- Self-hosting trades money for operational responsibility.
- Prioritize RAM and NVMe when sizing database servers.
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