What is a Block Cache in RocksDB?

The Block Cache is an in-memory cache that holds recently accessed data and index blocks from SSTables, reducing how often RocksDB needs to read from disk.

• Frequently accessed, or "hot," blocks stay in memory rather than being re-read from disk on every lookup
• Configurable in size, letting operators trade memory usage against read performance
• Shared across the database instance, so blocks from different SSTables can all benefit from the same cache

For read-heavy workloads, a well-sized block cache can be one of the single biggest levers for improving overall read latency.

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