What is Redis

• Redis is a in-memory data store, used as database, cache and message broker.
• Redis is NoSQL.
• Redis is non-volatile, different from memcached. Redis has built-in data persistency to avoid data disappearing from restart.

Commands

• SCAN: cursor-based
• MATCH: match pattern
• CONFIG: related to configuration of the server
• INFO: related to information of the server
• COMMAND: return details on redis commands
• CLIENT: manage clients

Data Types

• LISTS(Ordered): LPUSH, RPUSH, LRANGE, LLEN, LPOP, RPOP
• SETS(Unordered, No Repeating): SADD, SREM, SISMEMBER, SMEMBERS, SCARD, SMOVE, SUNION, SDIFF, SRANDOMEMBER, SPOP
• SORTED SETS(Ordered, Values No Repeating, Scores can repeat): ZADD, ZREM, ZRANGE, ZRANGEBYSCORE, ZRANK, ZCARD, ZCOUNT, ZINCBY, ZSCORE,
• HASH(Field-Value): HSET, HMSET, HGET, HMGET, HGETALL, HDEL, HEXISITS, HINCBY, HKEYS, HLEN, HVALS, HSTRLEN

Data Persistence(From Memory To Disk)

• RDB(Redis Database):Point-in-time Snapshots; SAVE, BGSAVE
• AOF(Append Only File): Write Operation Logging; rewrite, fsync;

Java Client

• Lettuce;
• Jedis;