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Database Sharding Basics
Split data to scale
Database sharding distributes data by key across shards to scale throughput; it needs a good shard key, routing layer, handling of hot keys, rebalancing, and cross-shard query strategies.
- sharding
- partitioning
- shard key
- routing
- rebalancing
Pick a Shard Key
Choose keys that balance load and avoid hotspots.
Route
Use routers or consistent hashing; handle rebalancing.
Query
Keep queries single-shard when possible; plan cross-shard ops carefully.
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