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replication-sharding-knowledge
Replication and Sharding knowledge base. Provides read/write splitting at application level, connection wrapper patterns, replica lag handling, and query routing for database scaling audits.
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# Replication and Sharding Knowledge Base
Quick reference for application-level read/write splitting, connection routing, and replica lag handling in PHP applications.
## Master-Slave (Primary-Replica) Overview
```
┌─────────────────────────────────────────────────────────────────────┐
│ PRIMARY-REPLICA READ/WRITE SPLIT │
├─────────────────────────────────────────────────────────────────────┤
│ │
│ Application Layer │
│ │ │
│ ├── INSERT / UPDATE / DELETE ──▶ Primary (Master) │