How Fivetran Solved Database Replication

The text discusses the evolution of Fivetran's data replication approach for its database connectors. Initially, they used snapshot-style replication which had limitations in capturing deleted data and tracking changes. They then moved to log-based replication, specifically using Postgres write-ahead logs (WAL), which allowed them to track deletions, incremental updates, and even full histories of tables. This approach improved the performance and resource usage of their connectors, making it more effective than their early efforts.