3302. Redis - Commands Quick ReferenceRedis
Redis commands list.
1. Storage
1.1 Keys
| No. | Command | Description |
|---|---|---|
| 1 | DEL key | This command deletes the key, if it exists. |
| 2 | DUMP key | This command returns a serialized version of the value stored at the specified key. |
| 3 | EXISTS key | This command checks whether the key exists or not. |
| 4 | EXPIRE key seconds | Sets the expiry of the key after the specified time. |
| 5 | EXPIREAT key timestamp | Sets the expiry of the key after the specified time. Here time is in Unix timestamp format. |
| 6 | PEXPIRE key milliseconds | Set the expiry of key in milliseconds. |
| 7 | PEXPIREAT key milliseconds-timestamp | Sets the expiry of the key in Unix timestamp specified as milliseconds. |
| 8 | KEYS pattern | Finds all keys matching the specified pattern. |
| 9 | MOVE key db | Moves a key to another database. |
| 10 | PERSIST key | Removes the expiration from the key. |
| 11 | PTTL key | Gets the remaining time in keys expiry in milliseconds. |
| 12 | TTL key | Gets the remaining time in keys expiry. |
| 13 | RANDOMKEY | Returns a random key from Redis. |
| 14 | RENAME key newkey | Changes the key name. |
| 15 | RENAMENX key newkey | Renames the key, if a new key doesn’t exist. |
| 16 | TYPE key | Returns the data type of the value stored in the key. |
1.2 Strings
| No. | Command | Description |
|---|---|---|
| 1 | SET key value | This command sets the value at the specified key. |
| 2 | GET key | Gets the value of a key. |
| 3 | GETRANGE key start end | Gets a substring of the string stored at a key. |
| 4 | GETSET key value | Sets the string value of a key and return its old value. |
| 5 | GETBIT key offset | Returns the bit value at the offset in the string value stored at the key. |
| 6 | MGET key1 [key2..] | Gets the values of all the given keys |
| 7 | SETBIT key offset value | Sets or clears the bit at the offset in the string value stored at the key |
| 8 | SETEX key seconds value | Sets the value with the expiry of a key |
| 9 | SETNX key value | Sets the value of a key, only if the key does not exist |
| 10 | SETRANGE key offset value | Overwrites the part of a string at the key starting at the specified offset |
| 11 | STRLEN key | Gets the length of the value stored in a key |
| 12 | MSET key value [key value …] | Sets multiple keys to multiple values |
| 13 | MSETNX key value [key value …] | Sets multiple keys to multiple values, only if none of the keys exist |
| 14 | PSETEX key milliseconds value | Sets the value and expiration in milliseconds of a key |
| 15 | INCR key | Increments the integer value of a key by one |
| 16 | INCRBY key increment | Increments the integer value of a key by the given amount |
| 17 | INCRBYFLOAT key increment | Increments the float value of a key by the given amount |
| 18 | DECR key | Decrements the integer value of a key by one |
| 19 | DECRBY key decrement | Decrements the integer value of a key by the given number |
| 20 | APPEND key value | Appends a value to a key |
1.3 Hashes
| No. | Command | Description |
|---|---|---|
| 1 | HDEL key field2 [field2] | Deletes one or more hash fields. |
| 2 | HEXISTS key field | Determines whether a hash field exists or not. |
| 3 | HGET key field | Gets the value of a hash field stored at the specified key. |
| 4 | HGETALL key | Gets all the fields and values stored in a hash at the specified key |
| 5 | HINCRBY key field increment | Increments the integer value of a hash field by the given number |
| 6 | HINCRBYFLOAT key field increment | Increments the float value of a hash field by the given amount |
| 7 | HKEYS key | Gets all the fields in a hash |
| 8 | HLEN key | Gets the number of fields in a hash |
| 9 | HMGET key field1 [field2] | Gets the values of all the given hash fields |
| 10 | HMSET key field1 value1 [field2 value2 ] | Sets multiple hash fields to multiple values |
| 11 | HSET key field value | Sets the string value of a hash field |
| 12 | HSETNX key field value | Sets the value of a hash field, only if the field does not exist |
| 13 | HVALS key | Gets all the values in a hash |
| 14 | HSCAN key cursor [MATCH pattern] [COUNT count] | Incrementally iterates hash fields and associated values |
1.4 Lists
| No. | Command | Description |
|---|---|---|
| 1 | BLPOP key1 [key2 ] timeout | Removes and gets the first element in a list, or blocks until one is available |
| 2 | BRPOP key1 [key2 ] timeout | Removes and gets the last element in a list, or blocks until one is available |
| 3 | BRPOPLPUSH source destination timeout | Pops a value from a list, pushes it to another list and returns it; or blocks until one is available |
| 4 | LINDEX key index | Gets an element from a list by its index |
| 5 | LINSERT key BEFORE/AFTER pivot value | Inserts an element before or after another element in a list |
| 6 | LLEN key | Gets the length of a list |
| 7 | LPOP key | Removes and gets the first element in a list |
| 8 | LPUSH key value1 [value2] | Prepends one or multiple values to a list |
| 9 | LPUSHX key value | Prepends a value to a list, only if the list exists |
| 10 | LRANGE key start stop | Gets a range of elements from a list |
| 11 | LREM key count value | Removes elements from a list |
| 12 | LSET key index value | Sets the value of an element in a list by its index |
| 13 | LTRIM key start stop | Trims a list to the specified range |
| 14 | RPOP key | Removes and gets the last element in a list |
| 15 | RPOPLPUSH source destination | Removes the last element in a list, appends it to another list and returns it |
| 16 | RPUSH key value1 [value2] | Appends one or multiple values to a list |
| 17 | RPUSHX key value | Appends a value to a list, only if the list exists |
1.5 Sets
| No. | Command | Description |
|---|---|---|
| 1 | SADD key member1 [member2] | Adds one or more members to a set |
| 2 | SCARD key | Gets the number of members in a set |
| 3 | SDIFF key1 [key2] | Subtracts multiple sets |
| 4 | SDIFFSTORE destination key1 [key2] | Subtracts multiple sets and stores the resulting set in a key |
| 5 | SINTER key1 [key2] | Intersects multiple sets |
| 6 | SINTERSTORE destination key1 [key2] | Intersects multiple sets and stores the resulting set in a key |
| 7 | SISMEMBER key member | Determines if a given value is a member of a set |
| 8 | SMEMBERS key | Gets all the members in a set |
| 9 | SMOVE source destination member | Moves a member from one set to another |
| 10 | SPOP key | Removes and returns a random member from a set |
| 11 | SRANDMEMBER key [count] | Gets one or multiple random members from a set |
| 12 | SREM key member1 [member2] | Removes one or more members from a set |
| 13 | SUNION key1 [key2] | Adds multiple sets |
| 14 | SUNIONSTORE destination key1 [key2] | Adds multiple sets and stores the resulting set in a key |
| 15 | SSCAN key cursor [MATCH pattern] [COUNT count] | Incrementally iterates set elements |
1.6 Sorted Sets
| No. | Command | Description |
|---|---|---|
| 1 | ZADD key score1 member1 [score2 member2] | Adds one or more members to a sorted set, or updates its score, if it already exists |
| 2 | ZCARD key | Gets the number of members in a sorted set |
| 3 | ZCOUNT key min max | Counts the members in a sorted set with scores within the given values |
| 4 | ZINCRBY key increment member | Increments the score of a member in a sorted set |
| 5 | ZINTERSTORE destination numkeys key [key …] | Intersects multiple sorted sets and stores the resulting sorted set in a new key |
| 6 | ZLEXCOUNT key min max | Counts the number of members in a sorted set between a given lexicographical range |
| 7 | ZRANGE key start stop [WITHSCORES] | Returns a range of members in a sorted set, by index |
| 8 | ZRANGEBYLEX key min max [LIMIT offset count] | Returns a range of members in a sorted set, by lexicographical range |
| 9 | ZRANGEBYSCORE key min max [WITHSCORES] [LIMIT] | Returns a range of members in a sorted set, by score |
| 10 | ZRANK key member | Determines the index of a member in a sorted set |
| 11 | ZREM key member [member …] | Removes one or more members from a sorted set |
| 12 | ZREMRANGEBYLEX key min max | Removes all members in a sorted set between the given lexicographical range |
| 13 | ZREMRANGEBYRANK key start stop | Removes all members in a sorted set within the given indexes |
| 14 | ZREMRANGEBYSCORE key min max | Removes all members in a sorted set within the given scores |
| 15 | ZREVRANGE key start stop [WITHSCORES] | Returns a range of members in a sorted set, by index, with scores ordered from high to low |
| 16 | ZREVRANGEBYSCORE key max min [WITHSCORES] | Returns a range of members in a sorted set, by score, with scores ordered from high to low |
| 17 | ZREVRANK key member | Determines the index of a member in a sorted set, with scores ordered from high to low |
| 18 | ZSCORE key member | Gets the score associated with the given member in a sorted set |
| 19 | ZUNIONSTORE destination numkeys key [key …] | Adds multiple sorted sets and stores the resulting sorted set in a new key |
| 20 | ZSCAN key cursor [MATCH pattern] [COUNT count] | Incrementally iterates sorted sets elements and associated scores |
1.7 HyperLogLog
| No. | Command | Description |
|---|---|---|
| 1 | PFADD key element [element …] | Adds the specified elements to the specified HyperLogLog. |
| 2 | PFCOUNT key [key …] | Returns the approximated cardinality of the set(s) observed by the HyperLogLog at key(s). |
| 3 | PFMERGE destkey sourcekey [sourcekey …] | Merges N different HyperLogLogs into a single one. |
2. Features
2.1 Publish Subscribe
| No. | Command | Description |
|---|---|---|
| 1 | PSUBSCRIBE pattern [pattern …] | Subscribes to channels matching the given patterns. |
| 2 | PUBSUB subcommand [argument [argument …]] | Tells the state of Pub/Sub system. For example, which clients are active on the server. |
| 3 | PUBLISH channel message | Posts a message to a channel. |
| 4 | PUNSUBSCRIBE [pattern [pattern …]] | Stops listening for messages posted to channels matching the given patterns. |
| 5 | SUBSCRIBE channel [channel …] | Listens for messages published to the given channels. |
| 6 | UNSUBSCRIBE [channel [channel …]] | Stops listening for messages posted to the given channels. |
2.2 Transactions
| No. | Command | Description |
|---|---|---|
| 1 | DISCARD | Discards all commands issued after MULTI |
| 2 | EXEC | Executes all commands issued after MULTI |
| 3 | MULTI | Marks the start of a transaction block |
| 4 | UNWATCH | Forgets about all watched keys |
| 5 | WATCH key [key …] | Watches the given keys to determine the execution of the MULTI/EXEC block |
2.3 Scripting
| No. | Command | Description |
|---|---|---|
| 1 | EVAL script numkeys key [key …] arg [arg …] | Executes a Lua script. |
| 2 | EVALSHA sha1 numkeys key [key …] arg [arg …] | Executes a Lua script. |
| 3 | SCRIPT EXISTS script [script …] | Checks the existence of scripts in the script cache. |
| 4 | SCRIPT FLUSH | Removes all the scripts from the script cache. |
| 5 | SCRIPT KILL | Kills the script currently in execution. |
| 6 | SCRIPT LOAD script | Loads the specified Lua script into the script cache. |
2.4 Connections
| No. | Command | Description |
|---|---|---|
| 1 | AUTH password | Authenticates to the server with the given password |
| 2 | ECHO message | Prints the given string |
| 3 | PING | Checks whether the server is running or not |
| 4 | QUIT | Closes the current connection |
| 5 | SELECT index | Changes the selected database for the current connection |
2.5 Server
| No. | Command | Description |
|---|---|---|
| 1 | BGREWRITEAOF | Asynchronously rewrites the append-only file |
| 2 | BGSAVE | Asynchronously saves the dataset to the disk |
| 3 | CLIENT KILL [ip:port] [ID client-id] | Kills the connection of a client |
| 4 | CLIENT LIST | Gets the list of client connections to the server |
| 5 | CLIENT GETNAME | Gets the name of the current connection |
| 6 | CLIENT PAUSE timeout | Stops processing commands from the clients for a specified time |
| 7 | CLIENT SETNAME connection-name | Sets the current connection name |
| 8 | CLUSTER SLOTS | Gets an array of Cluster slot to node mappings |
| 9 | COMMAND | Gets an array of Redis command details |
| 10 | COMMAND COUNT | Gets total number of Redis commands |
| 11 | COMMAND GETKEYS | Extracts the keys given a full Redis command |
| 12 | BGSAVE | Asynchronously saves the dataset to the disk |
| 13 | COMMAND INFO command-name [command-name …] | Gets an array of specific Redis command details |
| 14 | CONFIG GET parameter | Gets the value of a configuration parameter |
| 15 | CONFIG REWRITE | Rewrites the configuration file with the in-memory configuration |
| 16 | CONFIG SET parameter value | Sets a configuration parameter to the given value |
| 17 | CONFIG RESETSTAT | Resets the stats returned by INFO |
| 18 | DBSIZE | Returns the number of keys in the selected database |
| 19 | DEBUG OBJECT key | Gets debugging information about a key |
| 20 | DEBUG SEGFAULT | Makes the server crash |
| 21 | FLUSHALL | Removes all the keys from all databases |
| 22 | FLUSHDB | Removes all the keys from the current database |
| 23 | INFO [section] | Gets information and statistics about the server |
| 24 | LASTSAVE | Gets the UNIX time stamp of the last successful save to the disk |
| 25 | MONITOR | Listens for all the requests received by the server in real time |
| 26 | ROLE | Returns the role of the instance in the context of replication |
| 27 | SAVE | Synchronously saves the dataset to the disk |
| 28 | SHUTDOWN [NOSAVE] [SAVE] | Synchronously saves the dataset to the disk and then shuts down the server |
| 29 | SLAVEOF host port | Makes the server a slave of another instance, or promotes it as a master |
| 30 | SLOWLOG subcommand [argument] | Manages the Redis slow queries log |
| 31 | SYNC | Command used for replication |
| 32 | TIME | Returns the current server time |
2.6 Client Connection
| No. | Command | Description |
|---|---|---|
| 1 | CLIENT LIST | Returns the list of clients connected to Redis server |
| 2 | CLIENT SETNAME | Assigns a name to the current connection |
| 3 | CLIENT GETNAME | Returns the name of the current connection as set by CLIENT SETNAME |
| 4 | CLIENT PAUSE | This is a connections control command able to suspend all the Redis clients for the specified amount of time (in milliseconds) |
| 5 | CLIENT KILL | This command closes a given client connection |
3. Benchmarks
| Sr.No | Option | Description | Default Value |
|---|---|---|---|
| 1 | -h | Specifies server host name | 127.0.0.1 |
| 2 | -p | Specifies server port | 6379 |
| 3 | -s | Specifies server socket | |
| 4 | -c | Specifies the number of parallel connections | 50 |
| 5 | -n | Specifies the total number of requests | 10000 |
| 6 | -d | Specifies data size of SET/GET value in bytes | 2 |
| 7 | -k | 1=keep alive, 0=reconnect | 1 |
| 8 | -r | Use random keys for SET/GET/INCR, random values for SADD | |
| 9 | -p | Pipeline |
1 |
| 10 | -h | Specifies server host name | |
| 11 | -q | Forces Quiet to Redis. Just shows query/sec values | |
| 12 | –csv | Output in CSV format | |
| 13 | -l | Generates loop, Run the tests forever | |
| 14 | -t | Only runs the comma-separated list of tests | |
| 15 | -I | Idle mode. Just opens N idle connections and wait |