Cassandra Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

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What does the key cache store?

Byte offsets of the most recently accessed records

The key cache in Cassandra is specifically designed to store the byte offsets of the most recently accessed partition keys. This allows for quicker retrieval of those data partitions by reducing the amount of time taken to seek through the underlying storage system. By keeping track of these offsets, Cassandra can quickly access data that has been frequently queried, significantly enhancing read performance.

The other choices do not accurately describe the function of the key cache. The latest entries of the MemTable pertain more to what is stored in memory prior to being written to disk, while complete snapshots of data would relate more to backup processes rather than caching techniques. The storage of all write requests does not align with the caching mechanism's primary objective, which is to optimize read operations through efficient data retrieval rather than to store all transactional data.

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The latest entries of the MemTable

Complete snapshots of data

All write requests

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