CDC indentifies and captures changes made to data in source. it enables incremental data synchronization.it tracks insert, update and deletion operations.involves reading database transaction logs,using database triggers and tracking modification timestamps.Crutial for maintaining data warehouses enabling real-time replication.
Idempotency
this ensures that performning the same operation multiple times produces identical results. this prevents duplicate records and maintains data consistency when duplicate messages are processed
implementation include using unique keys, upsert operations, deduplication windows in streaming systems and maintaining processing state.eg using combination of timestamp and transactional id as a composite key ensuring reprocessing the same event doesn't create duplicates.
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