What is a Skip List?

A Skip List is a probabilistic data structure that maintains sorted data with multiple layers of "express lane" links, letting it support fast search, insertion, and deletion without the complexity of a balanced tree.

• The bottom layer contains every element in sorted order, like a regular linked list
• Higher layers contain progressively fewer elements, acting as shortcuts that let a search skip over large portions of the list
• Achieves roughly logarithmic-time operations on average, comparable to a balanced tree, but with a notably simpler implementation

This is the data structure RocksDB's default MemTable implementation is built on, chosen for its efficient ordered access combined with straightforward concurrent-access properties.

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