Introduction to redis and common commands

Keywords: ASP.NET Redis Windows Linux Database

Introduction to redis and common commands

Introduction to redis

Redis is an open source, BSD-licensed, key-value caching and storage system.Because Redis's keys include string, hash, list, set, sorted set, bitmap, and hyperloglog, they are often referred to as data structure servers.You can run atomic operations on these types, such as appending strings, increasing values in hashes, adding an element to a list, calculating the intersection, union, and difference of sets, or getting the highest ranked element from an ordered set.

For high performance, Redis uses in-memory datasets.Depending on your usage scenario, you can dump the dataset to disk at regular intervals or append each command to the log to persist.Persistence can also be disabled if you just need a feature-rich, networked memory cache.

Redis also supports master-slave asynchronous replication, very fast non-blocking initial synchronization, and automatic reconnection to local resynchronization when the network is disconnected.Other features include:

  • affair
  • Subscription/Publication
  • Lua script
  • Key with TTL
  • LRU Recycling Keys
  • Automatic failover

You can use Redis in many languages.

Redis is written in the ANSI C language and runs on most POSIX systems, such as Linux, *BSD, OS X, without additional dependency.Redis is developed and fully tested on both Linux and OS X operating systems, and we recommend Linux as a deployment environment.Redis can also run on Solaris-derived systems, such as SmartOS, but support needs to be enhanced.There is no officially supported build version of Windows, but Microsoft has developed and maintained a 64-bit version of Windows.

More about:

wikipedia:

Redis is an in-memory database open-source software project sponsored by Redis Labs. It is networked, in-memory, and stores keys with optional durability.

redis.io

Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache and message broker. It supports data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs and geospatial indexes with radius queries. Redis has built-in replication, Lua scripting, LRU eviction, transactions and different levels of on-disk persistence, and provides high availability via Redis Sentinel and automatic partitioning with Redis Cluster.

redis configuration

linux configuration

linux Download Installation Reference Official Web https://redis.io/download

windows configuration

The redis website does not provide support for Windows, but Microsoft's open source team did a Windows version of the project address: https://github.com/MSOpenTech/redis Now I want to sigh, Microsoft is great!!!

From here https://github.com/MSOpenTech/redis/releases Download the redis Windows version, I want to recall here that I last configured it with version 2.4.5, which also needs to execute commands manually to install services, manually configure environment variables. Now everything is automated. After installation, services are automatically installed and installed, you can chooseIt is really much easier to add the installation directory to the environment variable.

After downloading the latest release installation package, you can unpack the installation and add it to the environment variable.

Common commands for redis

Connect to remote redis server

1 redis-cli -h hostname/ip [-p port] [-a password]
2 
3 redis-cli - 172.16.20.233 -p 6379

 

Parameter Description

  • -h domain name or IP
  • -p port number (default port number is 6379)
  • -a Access Password (password access is not required by default, requirepass node of redis.conf can be modified if password is set)

basic operation

Note: Command names are case insensitive, key s and value s are case sensitive

 1 # Select database, use by default index 0 database
 2 SELECT index
 3 
 4 # Getting in Cache key
 5 # View all in the cache key
 6 KEYS *
 7 
 8 # Fuzzy Match Query Cache key
 9 KEYS aa*
10 KEYS *aaa
11 KEYS aa*bb
12 
13 # judge key Is it there
14 EXISTS key [key...]
15 
16 # Return Value Description
17 # - 1: existence
18 # - 0: Non-existent
19 
20 # according to key Obtain value
21 GET key
22 
23 # Return Value Description
24 # - (nil): key Non-existent
25 
26 # according to key Obtain value Of substring
27 GETRANGE key start end
28 
29 # To update key Of value Return to Old value
30 GETSET key value
31 
32 # Get multiple at once key Value of
33 MGET key [key ...]
34 
35 # Set up/Update Cached Value
36 SET key value [EX seconds] [PX milliseconds] [NX|XX]
37 
38 # Parameter Description
39 # - EX : Set expiration time in seconds
40 # - PX : Set expiration time in milliseconds
41 # - NX : only key Set when nonexistent key Of value
42 # - XX : only key Set when present key Of value
43 
44 SET key value PX milliseconds
45 SET key value EX seconds NX    
46 SET key value XX
47 
48 # only key Set if it does not exist, and `SET key value NX`The effect is the same
49 SETNX key value
50 
51 # Rewrite key Corresponding value Part of
52 SETRANGE key offset value
53 
54 # Obtain key Corresponding value Length
55 STRLEN key
56 
57 # according to key Delete values from cache
58 DEL key [key...]
59 
60 # integer Value of type minus one
61 DECR key
62 
63 # integer Type Value Decrease decrement
64 DECRBY key decrement 
65 
66 # integer Value of type plus one
67 INCR key
68 
69 # integer Type Value Decrease increment
70 INCRBY key increment

 

More key operations

 1 # Set in seconds key Expiration Time
 2 EXPIRE key seconds
 3 
 4 # Set in seconds key Expired UNIX time stamp
 5 EXPIREAT key timestamp
 6 
 7 # Set in milliseconds key Expiration Time
 8 PEXPIRE key milliseconds
 9 
10 # Set in milliseconds key Expired UNIX time stamp
11 PEXPIREAT key milliseconds-timestamp
12 
13 # move key To another database
14 MOVE key db
15 
16 # remove key Expiration time, set to no expiration
17 PERSIST key
18 
19 # Obtain key The remaining time to live is in seconds, and how long to expire is in seconds
20 TTL key
21 
22 #Return Value Description
23 # -2: key Non-existent
24 # -1: key Exists but no expiration time is set
25 
26 # Obtain key The remaining time to live is in milliseconds and how long to expire in milliseconds
27 PTTL key
28 
29 # Get a randomly generated key
30 RANDOMKEY
31 
32 # Rename one key
33 RENAME key newkey
34 
35 # Obtain key Stored value Data type
36 TYPE key
37 
38 # list or set sort
39 SORT key

 

More Commands

More References https://redis.io/commands

Remote Redis Debugging

  1. Connect to remote redis server
# Anonymous Access
redis-cli -h 172.16.20.233 -p 6479
# Password Access
redis-cli -h 172.16.20.233 -p 6479 -a p@ssword

 

  1. Using keys fuzzy query, query the full name of the key
# with aaa Ending key
keys *aaa
# with aaa initial key
keys aaa*
# Completely Fuzzy Matching Inclusion aaa Of key
keys *aaa*

 

  1. Find the key you want, copy the full key name, and if you return (empty list or set), there is no such key, check that your pattern is correct, and if it is correct, there is no key you want

  2. Query value based on key

get key

 

  1. Manually update the value of the key
set key value [EX seconds]

 

  1. Delete key
del key

 

More

redis client

redis has rich client support, and if you want a complete list, you can visit here https://redis.io/clients

redis command

redis command collection https://redis.io/commands

reids document

Official redis document https://redis.io/documentation

redis Download

redis Download

End

I can't think of anything to write about. Come back and write again. If you have any questions or questions, feel free to contact me at any time. weihanli@outlook.com

Posted by morrisoner on Sat, 29 Jun 2019 09:07:29 -0700

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