Shulou(Shulou.com)06/01 Report--

The concept of redis:

Redis is an open source memory-based and persistent log, Key-Value database

Redis tool:

Redis-benchmark # tools for redis performance testing

Redis-sentinel # for cluster management

Redis-cli # redis client

Redis-server # redis server

Redis-check-aof # AOF file used to fix the problem

Redis-check-dump # dump.rdb file used to fix the problem

Install redis

1. Install dependency package tcl,8.5 version or above

Tar zxvf tcl8.6.0-src.tar.gz-C / usr/src/ # decompression

Cd / usr/src/tcl8.6.0/unix/ # enter the source code directory

. / configure & & make & & make install # configuration compilation installation

2. Install redis

Rpm-ivh jemalloc-3.6.0-1.el6.x86_64.rpm # install dependent libraries

Rpm-ivh redis-3.2.8-1.el6.remi.x86_64.rpm # install redis

Service redis start # start the service

Ss-nalt | grep 6379 # check whether the service is started

Redis main data types:

1. String (strings)

two。 List (lists)

3. Collection (sets)

4. Ordered set (sorted sets)

5. Hash (hashes)

Command rules for redis key:

1.key should not be too long to avoid excessive memory consumption and reduce search efficiency.

two。 In a project, it is best for key to use a unified naming pattern

Basic use of redis-cli:

Redis-cli is mainly used to connect redis-server and operate with multiple redis-server.

Common options:

-- help # get help information

-h # specify redis database address, default is localhost

-p # designated port, default is 6379

-a # specifies the authentication password, which is empty by default

-n # specifies the login database. Default is database 0.

Third, the basic operation of redis

String

Set key value [EX seconds] # create a string, and EX sets the timeout

Get key # gets the value of the specified key

List

Rpush key value1 value2. # create an ordered list, first in, first out (commonly used)

Lpush key value1 value2. # create an ordered list, first in, then out

Lrange key start stop # get the elements in the list

Collection:

Sadd key value # create a collection

Smembers key # gets the value of the collection

Sismember key value # determines whether the value of value is within this set

Sinter key1 key2 # returns intersection

Sunion key1 key2 # returns union

Sdiff key1 key2 # returns subtractions

Hash:

Hset key hash_name hash_value # creates a hash mapping relationship, similar to dictionary data in python

Hgetall key # gets the value of the specified hash

General commands:

Help @ server # View a set of command help

Help set # View help for specified commands

Del key # Delete the specified key

Expire key # sets the timeout for the specified key

Ttl key # View the timeout of key

Persist key # Unspecify the timeout for key

Type key # returns the type of the specified key

Rename key1 key2 # rename key1 to key2

Flushdb # clear the key of the current database

Flushall # clear key for all databases

Dbsize # returns the number of key of the current database

Redis subscription and Publishing

Channel: consumers in a channel can receive the producer's information in this channel.

Subscribe Channel # subscribe to a channel

Psubscribe Channel # defines one or more channels by matching

Example: psubscribe * # subscribe to all channels

Psubscribe s [io] # subscribe to si and so

Publish Channel message # sends a message to the specified channel

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