Redis Documentary

http://redisdoc.com/

select [number]

There is 7 default databases in Redis.
use select [number] to change the database, for example:

COMMAND "dbsize" & "keys"

dbsize : tell how many keys in that database, keys : show the keys

So there is no <key, value> in database 1

But you can see there are 4 keys in database 0

set key value

set k1 v1

get key

FLUSHDB : clear current database ; FLUSHALL : clear all databases : THIS IS BIG CAUTION

5 Data Type

String ? Hash (like Map in Java) ? List ? Set ? Zset(sorted set)

String : 512MB at most for one string

Command about keys

exist key : show if a key exists

move key db

expire key [second] : terminate the key after some seconds

ttl key : return -1 means the key is not outdated, return -2 means the key is outdated

type key: show the type of the key

String

redis use

原文：https://www.cnblogs.com/nedrain/p/13295068.html