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データベース
Postgres、クエリプラン、インデックス、苦労して学んだ教訓。
The database is usually the slowest thing in the request path, the most expensive thing to get wrong in a migration, and the most load-bearing thing in the incident blameless post-mortem. Everything under this hub comes from the boring side of that - query plans, indexes, locks, and the operational reality of Postgres at scale.
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