The text provides a detailed guide on how to synchronize data from a PostgreSQL database to a Dragonfly in-memory store using Airbyte, an open-source ELT platform. It discusses the importance of transferring data for optimizing application performance, particularly in scenarios like caching frequently accessed data to enhance quick access and reduce load on primary databases. By illustrating a practical example of transferring daily metrics for fast lookup, the guide highlights the setup process using Docker containers for Postgres and Dragonfly, and the configuration of Airbyte to facilitate the data transfer. It emphasizes the efficiency of Airbyte in handling large datasets and its flexibility with scheduled and incremental data synchronization, making it ideal for non-real-time updates. However, it also notes the potential for delay in real-time applications and suggests complementing Airbyte with direct writes for immediate cache updates. The guide concludes by highlighting Dragonfly's compatibility with ELT tools and its suitability for handling large traffic with low latency, stressing the versatility of Airbyte in supporting various data integration use cases.