Ir-replikazzjoni tinżamm kopji tad-data fuq servers multipli — għal disponibbiltà (għad-superstit ta' fallimenti), read scaling (iserving tal-qraajiet minn kopji), u distribuzzjoni ġeografika. Istrategiji differenti (primary-replica, multi-primary, sync vs async) jinvolvu trade-offs.
Għaliex replikar
✓ 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.
