Key-value Database-redis

1. Introduction

Redis is a fully open source ANSI C language written, compliant with BSD protocol, high-performance Key-value database.

1.1 Features

• Redis supports data persistence, which saves data in memory on disk and can be loaded again for use when restarting.
• Redis not only supports simple key-value types of data, but also provides storage of data structures such as List,set,zset,hash.
• Redis supports backup of data, that is, Master-slave mode of data backup.

1.2 Advantages

• The performance is very high –redis can read the speed is 110,000 times/s, the write speed is 81,000 times/s.
• Rich data types –redis support binary case Strings, Lists, hashes, sets and Ordered sets data type operations.
• Atomic –redis All operations are atomic, meaning either successful execution or failure to execute at all. A single operation is atomic. Multiple operations also support transactions, namely atomicity, wrapped by multi and EXEC commands.

2. Install the 2.1windows installation

Download the Redis-x64-3.2.100.zip under Https://github.com/MicrosoftArchive/redis/releases.

Move the downloaded package to the C drive, create a new Redis folder, and unzip the compressed package under the Redis folder.

Open a cmd window using the CD command to switch directories to C:\redis run redis-server.exe redis.windows.conf .

c:\redis> redis-server.exe redis.windows.conf                _._ _.-           ' __ '-. _      _.-'    .  ' _.  ' -._           Redis 3.2.100 (00000000/0) a bit  .-".-".  ' \ \    _.,_ '-. _ (    '      ,       .-'  | ',    ) Running in     standalone mode | '-._ '-...-' __ ...-. '-._| ' ' _.-' |     port:6379 |    '-._ '   . _    /     _.-'    |     pid:11604  '-._    '-._  '-./  _.-'    _.-' | '-._ '-._    '-.__.-'    _.-' _.-' | |    '-._ '-._        _.-' _.-'    |           Http://redis.io  '-._    '-._ '-.__.-' _.-' _.-'    | '-._ '-._    '-.__.-'    _.-' _.-' | |    '-._ '-._        _.-' _.-'    |   '-._    '-._ '-.__.-' _.-' _.-"-._ '-.__.-' _.-" '-._      _.-'     '-.__.-'[11604] 11:04:00.253 # Server started, Redis version 3.2.100      

At this time another cmd window, the original do not close, otherwise you will not be able to access the server.

Switch to the Redis directory to run the redis-cli.exe-h 127.0.0.1-p 6379 .

Set the key-value pair set MyKey ABC

Remove key value pair get MyKey

C:\redis>redis-cli.exe-h 127.0.0.1-p 6379127.0.0.1:6379> Set mykey yaohongok127.0.0.1:6379> get  MyKey "Yaohong" 127.0.0.1:6379> 

3. Configuration

3.1 Getting the configuration

#CONFIG GET *

3.2 Convenient Configuration

#CONFIG SET loglevel "notice"

4. Data type

Redis supports five types of data: string (String), hash (hash), list, set (set), and Zset (sorted set: Ordered set).

5. Command 5.1 basic commands

Start the Redis client

c:\redis>redis-cli127.0.0.1:6379>

Detects if the Redis service is started

127.0.0.1:6379> pingpong

Connect remote

C:\redis>redis-cli-h 127.0.0.1-p 6379-a "Mypass"

Redis 127.0.0.1:6379>redis 127.0.0.1:6379> PING

5.2 Keys (key)

Add: SET keyname redis---Key followed by Key's name and key value

Delete: del keyname

Change: EXPIRE yhkey---Change the expiration time of key, EXPIRE in seconds, pexpire in milliseconds

TTL myname-----Change key never Expires

Rename Key Yhkey9

Check: Keys * query all keys

Keys yh* filters out keys that contain YH

exists KeyName determine if key exists

Pttl Mekey Find the time remaining for key

5.3redis-string

#增
127.0.0.1:6379> SET keyname2 "Hello MyName is Yaohong, what is your name?" OK
#查127 .0.0.1:6379> GET keyname2 "Hello MyName is Yaohong, what is your name?"

#截取字符串127 .0.0.1:6379> GETRANGE keyname2 2 "Llo myname is" 127.0.0.1:6379> keys *) "KeyName2" 2) "Yhkey1" 3) "Yhkey9 "4)" Yhkey3 "5)" keyname1 "6)" Yhyhkey "7)" MyKey "

#同时获取多个字符串127 .0.0.1:6379> GET yhkey1 yhkey3 (Error) ERR wrong number of arguments for ' GET ' command127.0.0.1:63 79> MGET yhkey1 yhkey31) "Redis" 2) "Redis" 127.0.0.1:6379>  

5.4redis-hash

Add: Hmset (simultaneous setting of multiple file-value into the hash table), Hget

Deletion: Hdel

Check: Hget, Hgetall,hkey get all the fields in the hash table (file),

  Hmget myhash file1 file2 file3 (returns the value of one or more given fields in a hash table)

Hvals get all the values in the hash table

Sentence: Hexists judge whether there is

Hlen Get file Count

5.5redis-list

The Redis list is a simple list of strings, sorted by insertion order. You can add an element to the head of the list (to the left) or to the tail (to the right)

Increase: Lpush (header insertion Element), Rpush (trailing insert Element)

Delete: Lpop (removes the first element of the list), Rpop (removes the last element of the list), Lrem KeyName count value (count greater than 0 deletes the value element from the head)

Check: Llen (get list length), Lreng key start Stop (get start to stop Element)

Change: LSet, RSet

5.6redis-set

Increase: Sadd,

Sunionstore myset myset1 Myset2 Command stores the assembly of a given collection in the specified collection MySet

Delete: Spop remove random number from collection

Srem removing elements from a collection by value

Check: Smembers, SCard (get member number),

Sdiff (lists the elements that the first collection owns, the second collection does not),

Sdiffstore (holds the first collection, the elements that are not in the second collection are saved to the third collection),

Sinter (lists the intersection of two collections)

Smembers List all members of a collection

Change:smove myset1 myset2 "Key1" moves key1 from Myset1 to Myset2

Sismember: Determines whether the element is a member of key

5.7redis-zset

A Redis ordered collection is a collection of elements of type string, as well as a collection, and does not allow duplicate members.

Add: Zadd keyname Scoren value

Delete: Zrem keyname nember Remove one or more members from an ordered collection

Zremrangebylex key min Max removes all members of the given dictionary interval in the ordered collection.

Zremrangebyrank key Start stop removes all members of the given rank range in the ordered collection

zremrangebyscore Key min Max removes all members of a given fractional interval in an ordered collection

Check: Zcard Gets the number of members of the collection

Zcount Key min Max calculates the number of members that specify interval fractions in an ordered set

zrange key start Stop withscores returns an ordered set of members within a specified range by an index interval

5.8 Business

Redis transactions can execute multiple commands at once

Start transaction: MULTI

Execution transaction: EXEC

Cancel transaction: DISCARD cancels the transaction and discards all commands within the transaction block

Monitoring transactions: Watch monitors one or more keys, and if this (or these) keys are changed by other commands before the transaction is executed, the transaction is interrupted

Suppress monitoring: unwatch suppress watch command for all key monitoring.

5.9 Scripts

The Eval command executes the script using the Lua interpreter.

5.10 Servers

Redis server commands are primarily used to manage redis services.

Statistical parameters: INFO

Reset some statistics in the INFO command: Config resetstat

Number of keys: dbsize

Delete all Key:flushall

Delete Current Database key:flushdb

Save data asynchronously to hard disk: Save

6.Redis Advanced 6.1Redis Data backup and recovery

Backup: Save

Recovery: 1: Move the generated RDB file to the Redis installation directory (execute config get dir) and start the service

You can also create a Redis backup file using the command BGSAVE, which executes in the background.

6.2Redis Security

Set"Itnihao"
Auth Itnihaoget requirepass

6.3Redis Performance Test6.4Redis Client Connection

To view the maximum number of connections:config get maxclients

To set the maximum number of connections: Redis-Server --maxclients 100000

6.5Redis Pipeline Technology

Redis pipeline technology can continue to send requests to the server when the service side is not responding, and eventually read all server-side responses at once.

6.6Redis Partitioning

Partitioning is the process of splitting data into multiple Redis instances, so each instance holds only a subset of the keys.

Key-value Database-redis