Replikasi njaga salinan data ing saperangan server — kanggo ketersediaan (selamet saka kegagalan), penskalaan bacaan (layani bacaan saka salinan), lan distribusi geografis. Strategine beda-beda (primary-replica, multi-primary, sinkron vs asinkron) gawe trade-offs.
Kenapa nreplikasi
✓ AVAILABILITY/redundancy → if one copy fails, others have the data (no data loss, failover)
✓ READ SCALING → serve reads from replicas (offload the primary) → handle more reads
✓ GEO-DISTRIBUTION → copies near users (lower latency); disaster recovery
→ replication is fundamental to reliable, scalable data systems.
