--- type: archive area: archive status: archived date: 2026-05-03 created: 2026-05-03 updated: 1980-01-01 tags: - archive --- DECR: This command decrements the value of a key by 1. If the key does not exist, it is initialized to 0 before decrementing. DECRBY: Similar to DECR, but it decrements the value of a key by the specified integer amount. DEL: Deletes one or more keys. It removes the specified keys and their associated data from the database. EXISTS: Checks whether a key exists in the database. It returns 1 if the key exists and 0 if it does not. EXPIRE: Sets a timeout on a key. It specifies the number of seconds until a key expires and is automatically removed from the database. GET: Retrieves the value associated with a key. It returns the value stored under the specified key. GETSET: Retrieves the current value of a key and then sets a new value for the key. Useful for atomic updates. HDEL: Deletes one or more fields from a hash data structure associated with a key. HEXISTS: Checks if a field exists in a hash data structure associated with a key. HGET: Retrieves the value of a field from a hash data structure associated with a key. HGETALL: Retrieves all field-value pairs from a hash data structure associated with a key. HINCRBY: Increments the value of a field in a hash data structure by a specified integer amount. HKEYS: Retrieves all field names from a hash data structure associated with a key. HLEN: Returns the number of fields in a hash data structure. HMGET: Retrieves the values of multiple fields from a hash data structure associated with a key. HMSET: Sets multiple field-value pairs in a hash data structure associated with a key. HSET: Sets the value of a field in a hash data structure. HVALS: Retrieves all values from a hash data structure associated with a key. INCR: Increments the value of a key by 1. If the key does not exist, it is initialized to 0 before incrementing. INCRBY: Similar to INCR, but it increments the value of a key by the specified integer amount. KEYS: Returns all keys that match a given pattern. Be cautious when using this command in production, as it can be slow for large databases. LINDEX: Retrieves an element from a list by its index. LLEN: Returns the length of a list. LPOP: Removes and returns the first element from a list. LPUSH: Prepends one or more elements to the beginning of a list. LRANGE: Retrieves a range of elements from a list. LREM: Removes elements from a list based on their value. LSET: Sets the value of an element in a list by its index. LTRIM: Trims a list to the specified range of elements. MGET: Retrieves the values of multiple keys. MSET: Sets the values of multiple keys. MSETNX: Sets the values of multiple keys only if none of the keys already exist. MULTI: Marks the start of a transaction. All commands following MULTI are queued and executed atomically. PEXPIRE: Sets a timeout on a key in milliseconds. RENAME: Renames a key to a new name. RENAMENX: Renames a key to a new name, but only if the new name does not already exist. RPOP: Removes and returns the last element from a list. RPOPLPUSH: Removes the last element from one list and pushes it to another list. RPUSH: Appends one or more elements to the end of a list. SADD: Adds one or more members to a set. SCARD: Returns the number of members in a set. SDIFF: Returns the members that are present in the first set but not in the other specified sets. SDIFFSTORE: Stores the difference between two or more sets in a new set. SET: Sets a key to hold a string value. SETEX: Sets a key with an expiration time in seconds. SETNX: Sets a key's value only if the key does not exist. SINTER: Returns the members that are common to all specified sets. SINTERSTORE: Stores the intersection of multiple sets in a new set. SISMEMBER: Checks if a member exists in a set. SMEMBERS: Returns all members of a set. SMOVE: Moves a member from one set to another set. SORT: Returns a sorted version of a list, set, or sorted set. SPOP: Removes and returns a random member from a set. SRANDMEMBER: Returns one or more random members from a set. SREM: Removes one or more members from a set. SUNION: Returns the union of multiple sets. SUNIONSTORE: Stores the union of multiple sets in a new set. TTL: Returns the remaining time to live of a key with an expiration set by EXPIRE or PEXPIRE. TYPE: Returns the data type of a key. ZADD: Adds one or more members to a sorted set. ZCARD: Returns the number of members in a sorted set. ZCOUNT: Returns the number of members in a sorted set within a specific range. ZINCRBY: Increments the score of a member in a sorted set by a specified amount. ZRANGE: Returns a range of members from a sorted set by their rank. ZRANGEBYSCORE: Returns a range of members from a sorted set within a specific score range. ZRANK: Returns the rank of a member in a sorted set. ZREM: Removes one or more members from a sorted set. ZREMRANGEBYSCORE: Removes members from a sorted set within a specific score range. ZREVRANGE: Returns a range of members from a sorted set in reverse order. ZSCORE: Returns the score of a member in a sorted set.