<ul><li>A file-based hash map is a method of using persistent disk storage while retaining the performance benefits of direct memory access.</li><li>The implementation involves adapting hash maps for file-based storage using a hash function.</li><li>Collisions (when the hash function returns the same address for different keys) are addressed using separate chaining.</li><li>The final structure consists of an index, heap, and buckets with keys and values.</li></ul>

File-based hash map — using as persistent data storage

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