preface
Redis is an open source, network-enabled, memory-based, persistent, logging, key-value database written in ANSIC, and provides multiple language apis.
Redis can be widely used in microservice architectures. It may be one of the few popular software solutions that your application can leverage in many different ways. It can act as a master database, cache, and message broker on request.
In addition to these basic commands, I also organized the Redis command Reference Manual PDF, which is free to share with everyone. In addition, there are “Redis development and operation”, “Redis design and implementation”, “Redis white introductory guide” and “2021Redis latest interview questions” and other Redis learning related information, are at the end of the article, if you need to take.
All right, no more words, just sit tight and let’s go!
Redis startup
- Local boot: redis-cli
- Remote boot: redis-cli -h host -p port -a password
Redis connection command
- AUTH password Verifies that the password is correct
- ECHO message Prints a character string
- PING to check whether the service is running
- QUIT Closes the current connection
- SELECT index switches to the specified database
Redis keys
1, the DEL key
The DUMP key serializes the given key and returns the serialized value
2, the EXISTS the key
Checks whether the given key exists
EXPIRE key seconds
Set the expiration time for the key
EXPIRE key timestamp
Set the expiration time of the key by timestamp
PEXPIRE key milliseconds
Sets the expiration time of the key in milliseconds
6, the KEYS of the pattern
Find all keys that match the given pattern
MOVE key DB
Move the key of the current database to the database DB
8, PERSIST the key
If you remove the expiration time of a key, the key will be persisted
9, PTTL key
Returns the remaining expiration time of the key in milliseconds
10, TTL key
Returns the remaining lifetime of a given key, in seconds
11, RANDOMKEY
Returns a random key from the current database
12, RENAME key newkey
Change the name of the key
13. RENAMENX key Newkey
Change the name of the key to newkey only when newkey does not exist
14, TYPE the key
Returns the type of the value stored by key
Reids string command
1. SET key value
2, GET the key
3. GETRANGE key start end
Returns a subcharacter of the string value in key
4. GETSET key value
Sets the value of the given key to value and returns the old value of the key
5. GETBIT KEY OFFSET
Gets the bit at the specified offset for the string value stored by key
MGET KEY1 KEY2
Gets the value of one or more given keys
7. SETBIT KEY OFFSET VALUE
Sets or clears bits at the specified offset for the string value that is stored by key
8. SETEX key seconds value
Associate the value value with the key and set the expiration time of the key to seconds.
9. SETNX key value
Set the key value only if the key does not exist.
10. SETRANGE key offset value
Overwrites the string value stored for the given key with the value argument, starting at offset.
11, STRLEN key
Returns the length of the string value stored by key.
12、MSET key value [key value …]
Set one or more key-value pairs at the same time.
13、MSETNX key value [key value …]
Sets one or more key-value pairs simultaneously if and only if none of the given keys exist.
PSETEX key milliseconds value
This command is similar to the SETEX command, but it sets the lifetime of the key in milliseconds, rather than seconds, as the SETEX command does.
15, INCR key
Increment the value of the number stored in the key by one.
16, INCRBY Key increment
Add the value stored in the key to the given increment.
17, INCRBYFLOAT Key increment
Add the value stored by key to the given floating point increment.
18, DECR key
Subtract the number stored in the key by one.
19. DECRBY Key Decrement
Values stored by key minus the given decrement value.
20. APPEND key value
If the key already exists and is a string, the APPEND command appends the specified value to the end of the original value.
4. Redis hash command
1, HDEL key field1 [field2]
Deletes one or more hash table fields
2. HEXISTS key field
Check whether the specified field in the hash table key exists.
3. HGET key field
Gets the value of the specified field stored in the hash table.
4, HGETALL key
Gets all the fields and values of the specified key in the hash table
5, HINCRBY Key field increment
Add increment to the integer value of the specified field in the hash table key.
6. HINCRBYFLOAT Key field increment
Increments the floating point value of the specified field in the hash table key.
7, HKEYS key
Gets all fields in the hash table
8, HLEN key
Gets the number of fields in the hash table
9, HMGET key field1 [field2]
Gets the values of all given fields
10、HMSET key field1 value1 [field2 value2 ]
Set multiple field-value pairs into the hash key at the same time.
11. HSET key field value
Set the value of field in hash table key to value.
12. HSETNX Key field value
Set the value of the hash table field only if the field field does not exist.
13, HVALS key
Gets all values in the hash table
14, HSCAN key cursor [MATCH pattern] [COUNT COUNT]
Iterates key-value pairs in a hash table.
Redis list command
1、BLPOP key1 [key2 ] timeout
Removes and retrieves the first element of the list. If there are no elements in the list, the list is blocked until the wait times out or an eject element is found.
2、BRPOP key1 [key2 ] timeout
Removes and retrieves the last element of the list. If there are no elements in the list, the list is blocked until the wait times out or an eject element is found.
3, BRPOPLPUSH source destination timeout
Pops a value from a list, inserts the pop-up element into another list and returns it; If the list has no elements, it blocks until the wait times out or a popup element is found.
4. LINDEX Key index
Gets the elements in the list by index
5, LINSERT key BEFORE | AFTER the pivot value
Inserts an element before or after the element in the list
6, LLEN key
Get the list length
7, LPOP key
Removes and gets the first element of the list
8, LPUSH key value1 [value2]
Inserts one or more values into the list header
9. LPUSHX key value
Inserts a value into the head of an existing list
10. LRANGE key start stop
Gets the elements in the specified range of the list
11. LREM key count value
Remove list elements
12, LSET key index value
Set the value of a list element by index
13. LTRIM key start stop
To trim a list, that is, to keep only elements within a specified range, and to remove all elements that are not within a specified range.
14, RPOP key
Removes and gets the last element of the list
15, RPOPLPUSH source destination
Removes the last element of the list and adds it to another list and returns
16, RPUSH key value1 [value2]
Adds one or more values to the list
17, RPUSHX key value
Add a value to an existing list
Redis collection command
1, SADD key member1 [member2]
Adds one or more members to a collection
2, SCARD key
Gets the number of members of the collection
SDIFF key1 [key2]
Returns the difference set of all sets given
4, SDIFFSTORE destination key1 [key2]
Returns the difference set for a given collection and stores it in destination
5 、SINTER key1 [key2]
Returns the intersection of all sets given
6, SINTERSTORE destination key1 [key2]
Returns the intersection of all the given collections and stores them in destination
7, SISMEMBER key member
Check whether the member element is a member of the collection key
8, SMEMBERS key
Returns all members of the collection
SMOVE source member
Move the member element from the source collection to the Destination collection
10, SPOP key
Removes and returns a random element from the collection
SRANDMEMBER key [count]
Returns one or more random numbers in a collection
12, SREM key member1 [member2]
Removes one or more members of a collection
13, SUNION key1 [key2]
Returns the union of all given sets
14, SUNIONSTORE Destination key1 [key2]
The union of all given collections is stored in the Destination collection
15, SSCAN key cursor [MATCH pattern] [COUNT COUNT]
Iterate over the elements in the collection
Redis ordered collection command
1, ZADD key score1 member1 [score2 member2]
Adds one or more members to an ordered collection, or updates the scores of existing members
2, ZCARD key
Gets the number of members of an ordered collection
3. ZCOUNT key min Max
Computes the number of members in an ordered set with a specified interval fraction
4, ZINCRBY key increment member
Increment the score of a specified member in an ordered set
ZINTERSTORE destination numkeys key [key…]
Computes the intersection of one or more ordered sets given and stores the result set in a new ordered set key
6. ZLEXCOUNT key min Max
Computes the number of members in the specified dictionary range in an ordered collection
7, ZRANGE key start stop [WITHSCORES]
Returns an ordered collection of the members of a specified interval through an indexed interval
7, ZRANGEBYLEX key min Max [LIMIT offset count]
Returns a member of an ordered collection through a dictionary interval
Max [WITHSCORES] [LIMIT]
Returns an ordered set of members within a specified interval by a fraction
10, ZRANK key member
Returns the index of the specified member in the ordered collection
11、ZREM key member [member …]
Removes one or more members of an ordered collection
12. ZREMRANGEBYLEX key min Max
Removes all members of the given dictionary range from the ordered collection
13, ZREMRANGEBYRANK key start stop
Removes all members of the given rank range from the ordered collection
14. ZREMRANGEBYSCORE key min Max
Removes all members of the given fractional interval from the ordered set
15, ZREVRANGE key start stop [WITHSCORES]
Returns the members of an ordered set in a specified interval, indexed from high to bottom
16, ZREVRANGEBYSCORE key Max min [WITHSCORES]
Returns the members of the ordered set within the specified range of scores, sorted from highest to lowest
17, ZREVRANK key member
Returns the ranking of the specified members of an ordered set, ordered in decreasing order (from largest to smallest) by score value
18, ZSCORE key member
Returns the score value of a member in an ordered set
19、ZUNIONSTORE destination numkeys key [key …]
Computes the union of a given one or more ordered sets and stores it in a new key
20, ZSCAN key cursor [MATCH pattern] [COUNT COUNT]
Iterating over elements in an ordered set (including element members and element scores)
Redis issues subscription commands
1、PSUBSCRIBE pattern [pattern …]
Subscribe to one or more channels that conform to a given pattern.
2、PUBSUB subcommand [argument [argument …]
View the subscription and publication system status.
PUBLISH Channel message 3
Sends the message to the specified channel.
4, subscribe [pattern [pattern…]]
Unsubscribe all channels for a given mode.
5, SUBSCRIBE channel [channel…
Subscribe to a given channel or channels of information.
6、UNSUBSCRIBE [channel [channel …]]
To unsubscribe from a given channel.
Example:
Redis 127.0.0.1:6379> SUBSCRIBE redisChat Reading messages... (press Ctrl-C to quit) "subscribe" "redisChat" (integer) 1Copy the codeNow, let’s restart a Redis client and publish twice on redisChat on the same channel so that subscribers can receive the messages. Redis 127.0.0.1:6379> PUBLISH redisChat “Redis is a great Caching technique”
(integer) 1
The subscriber's client will display the following message: 1) "message" 2) "redisChat" 3) "Redis is a great Caching technique"Copy the codeRedis transaction command
1, the DISCARD
Cancels the transaction, abandoning all commands in the transaction block.
2, the EXEC
Execute all commands within the transaction block.
3, MULTI
Marks the start of a transaction block.
4, UNWATCH
Unmonitor all keys with the WATCH command.
5. [key…]
Monitor a key (or keys) and interrupt the transaction if the key (or keys) is changed by another command before the transaction executes.
Redis script command
1, EVAL script numkeys [key… arg [arg …]
Execute the Lua script.
EVALSHA sha1 numkeys key [key…] arg [arg …]
Execute the Lua script.
3, SCRIPT EXISTS.
Checks whether the specified script has been saved in the cache.
4, SCRIPT FLUSH
Remove all scripts from the script cache.
5, the SCRIPT to KILL
Kill the currently running Lua script.
SCRIPT LOAD SCRIPT 6
The script script is added to the script cache, but it is not executed immediately.
Redis server command
1, BGREWRITEAOF
Perform an AOF (AppendOnly File) File rewrite asynchronously
2, BGSAVE
Asynchronously saves the current database data to disk in the background
3, CLIENT KILL [IP :port] [ID client-id]
Close the client connection
4, CLIENT LIST
Gets a list of client connections to the server
5, CLIENT GETNAME
Gets the name of the connection
6. CLIENT PAUSE timeout
Terminates the execution of a command from a client within the specified time
7. CLIENT SETNAME connection-name
Sets the name of the current connection
8, CLUSTER SLOTS
Gets a mapping array of cluster nodes
9, the COMMAND
Gets an array of Redis command details
10 and the COMMAND of the COUNT
Gets the total number of Redis commands
11, the COMMAND GETKEYS
Gets all keys for a given command
12, the TIME to return
Return to the current server time
13、COMMAND INFO command-name [command-name …]
Gets an array of descriptions for the specified Redis command
14, CONFIG GET parameter
Gets the value of the specified configuration parameter
15, the CONFIG REWRITE
Overwrite the redis.conf configuration file specified when starting the Redis server
16, CONFIG SET
Arameter value Modifies redis configuration parameters without restart
17, the CONFIG RESETSTAT
Reset some statistics in the INFO command
In the 18th and DBSIZE
Returns the number of keys in the current database
19. DEBUG OBJECT keys
Obtain key debugging information
20, the DEBUG SEGFAULT
Crash the Redis service
21, and FLUSHALL
Delete all keys for all databases
22, FLUSHDB
Delete all keys from the current database
23, the INFO/section
Get all kinds of information and statistics of Redis server
24, LASTSAVE
Returns the last time Redis successfully saved data to disk, in UNIX timestamp format
25, MONITOR
Real – time print Redis server received command, debugging
26, ROLE
Returns the role to which the primary and secondary instances belong
27, SAVE
Synchronization saves data to hard disks
28, SHUTDOWN [SAVE]
Asynchronously saves data to hard disk and shuts down server
29. SLAVEOF host port
Convert the current server to a slave server for the specified server
30, SLOWLOG subcommand [argument]
Manage slow logs in Redis
31, SYNC
Internal command for replication
Thanks to see here [fist bump], space is limited to write these first, sorted Redis learning materials are put here
