db-replication-sharding
DB Replication Sharding
Overview
Use this skill to design data topology that scales safely without hiding consistency and operability costs.
Scope Boundaries
- Throughput, storage, or availability limits exceed single-instance capacity.
- Read/write scaling requires replication or partitioning.
- Regional or tenant growth pressures topology redesign.
Core Judgments
- Replication mode and consistency expectations for read paths.
- Shard key strategy and future rebalancing feasibility.
- Cross-shard query/transaction requirements.
- Failover behavior and recovery-time expectations.
Practitioner Heuristics
- Choose shard keys by access locality and growth distribution, not by convenience.
- Read replicas are eventually consistent systems; classify which reads can tolerate lag.
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