To maintain good read performance in a constantly changing database, which components are utilized?

Delta storage is the correct choice for maintaining good read performance in a constantly changing database in SAP HANA. This is because delta storage plays a crucial role in managing the frequent changes and high transaction rates that accompany a dynamic dataset.

In SAP HANA, delta storage is used to store recent updates and changes to the data. When modifications are made, initial changes are written to delta storage, which allows for efficient handling of these transactions without immediately impacting the main storage. This structure reduces the write amplification in main storage, where the columnar data is organized for optimized read access. Since delta storage contains smaller increments of data changes, read operations can occur without being blocked by ongoing write operations, leading to improved overall read performance.

While other components like column store and main storage are important for overall database performance, delta storage specifically addresses the challenge of quickly changing data, allowing the system to quickly process and retrieve the most recent updates without degrading the performance level for read operations. Memory store refers to the in-memory nature of HANA but does not specifically address strategies for handling change in dynamics like delta storage does.