Database synchronization keeps two or more databases consistent by copying inserts, updates, and deletes between them. The main sync types are insert sync (copies new rows to target), update sync (propagates changes), drop sync (removes deleted rows from target), mixed sync (combines all three), bidirectional sync (changes flow in both directions with conflict handling), and CDC replication (continuous event-based change capture with lower latency). Primary keys are essential for reliable sync. Classic sync runs as a scheduled job comparing tables, while CDC reads change events continuously for near-real-time replication.
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