How Redis Implements Binary‑Safe Strings with Simple Dynamic Strings (SDS)

This article explains the design and evolution of Redis's Simple Dynamic Strings (SDS), covering the original pre‑3.2 structure, the newer type‑specific headers, the core API functions for creating, clearing, and concatenating SDS objects, and the memory‑reallocation strategy that ensures binary safety and efficient storage.

Binary SafetyCData Structures

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How Redis Implements Binary‑Safe Strings with Simple Dynamic Strings (SDS)