Software Engineering :: Database :: Redis :: Data Structure :: Sorted Sets (ZSet)

readme.md

Software Engineering :: Database :: Redis :: Data Structure :: Sorted Sets (ZSet)

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Sorted Sets (ZSet)

A sorted set is an ordered collection of unique members and an associated score.

• Priority Queues
• Low-Latency Game Leaderboard (i.e. experience points)
• Secondary Indexing

Benefits

• Responsive
• In-Memory Structure (Low-Latency)

Commands

• ZADD: Adds all the specified members with the specified scores to the sorted set stored at key.
• ZINCRBY: Increments the score of member in the sorted set stored at key by increment.
• ZRANK: Returns the rank of member in the sorted set stored at key, with the scores ordered from low to high. The rank (or index) is 0-based, which means that the member with the lowest score has rank 0.
• ZREVRANK: Returns the rank of member in the sorted set stored at key, with the scores ordered from high to low. The rank (or index) is 0-based, which means that the member with the highest score has rank 0.
• ZRANGE: Returns the specified range of elements in the sorted set stored at <key>.
• ZSCORE: Returns the score of member in the sorted set at key.

ZADD <KEY> <SCORE> <MEMBER>
ZINCRBY <KEY> <INCREMENT> <MEMBER>
ZRANGE <KEY> <START> <END> REV BYSCORE
ZRANK <KEY> <MEMBER> [WITHSCORE]
ZREVRANK <KEY> <MEMBER> [WITHSCORE]
ZSCORE <KEY> <SCORE>

Leaderboard Goals

• Display the TOP 10 players
• See a player's rank
• See a player's score

YouTube Research

• Redis Sorted Sets Explained

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