Web Reference: Jul 23, 2025 · A persistent data structure is a data structure that always preserves the previous version of itself when it is modified. They can be considered as ‘immutable’ as updates are not in-place. Learn about data structures that always preserve the previous version of themselves when they are modified. Compare different techniques for creating and accessing persistent data structures, such as copy-on-write, fat node, path copying and combination. Partial persistence lets you make modifications only to the present data structure but allows queries of any previous version. These previous versions might be accessed via a timestamp. Full persistence lets you make queries and modifications to all previous versions of the data structure.
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