Hi @GANGISER

No, Cassandra is not the only choice for DDS service when externalized. Pega supports the use of Apache Kafka as an alternative to Cassandra for DDS.

Ultimately, the best choice between Cassandra and Kafka for DDS in Pega depends on the specific requirements of your application. If you need a highly scalable and fault-tolerant solution for handling large volumes of data, Cassandra may be a better choice. If you need a high-performance and easy-to-manage solution for real-time data ingestion, Kafka may be a better option. In addition to Cassandra and Kafka, Pega is also exploring the support of other DDS technologies, such as Redis and Amazon DynamoDB.

Hope it helps.

Thank You

Megha