Redis's five data types correspond to the underlying structure

Redis provides five data types, each type has its underlying data structure: String: SDS (binary safe, space efficient) Hash: Hash table (key-value pair storage) List: Doubly linked list ( Ordered data set) Set: Integer set or hash table (unduplicated elements) Ordered set: Jump list (sort by score and range search)

Redis five data types and their underlying structures

Redis provides five basic data types, each type has a different underlying data structure to store and operate data.

1. String

• Underlying structure: SDS (Simple Dynamic String)
• Features: Binary security, space efficiency , supports append and range operations

2. Hash

• Underlying structure: Hash table
• Features : Stores key-value pair data, supports fast query and deletion

3. List

• Underlying structure: doubly linked list, special encoding
• Features: Ordered data collection, supports adding and deleting elements from the head or tail of the table

4. Set

• Underlying structure: integer set or hash table
• Features: stores unique elements, supports fast query and intersection and union operations

##5. Ordered set (zset)

Underlying structure: jump table
• Features: Stores elements with scores, supports sorting by score and range search

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