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How to serve 800 million users without database sharding?

How to serve 800 million users without database sharding?

OpenAI serves over 800 million weekly ChatGPT users without database sharding. Inside the architecture: a single primary PostgreSQL, cascading read replicas, aggressive caching against thundering herds, and connection pooling pushed to its limits.

Feb 23, 2026

Sidekiq basic_fetch and super_fetch differences

Sidekiq basic_fetch and super_fetch differences

Sidekiq basic_fetch vs super_fetch: open source Sidekiq fetches jobs with BRPOP and loses them when a process crashes, while Sidekiq Pro's super_fetch uses RPOPLPUSH with private per-process queues to recover orphaned jobs. What that means for queue reliability.

May 8, 2023

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