Links

• Cheat sheet
• Redis commands

Redis configuration

Documentation on configuration

Command to get the expired events from Redis:

config set notify-keyspace-events AKE

Redis cli commands

set user:1:name 1
set user:2:name 2
get user:1:name
keys user*
scan 0
del user:1:name 1
get user:1:name
flushddb
set a b ex 10
get a
get a
ttl a
expire a 60
set c d exat 1624737950

xx nx

set e f xx
get e
set e f nx
get e
set e g nx
get e

incr

set a 1
incr a
get a
flushdb
incr bb
keys *
get bb
decr bb
get b
flushdb
set a 1.02
get a
incrbyfloat a .3
get a
set sam 100
incr sam
incrby sam 20
incrby sam 20
decrby sam 5

set user:1:lives 3 ex 1800
ttl user:1:lives
decr user:1:lives
decr user:1:lives
decr user:1:lives
flushdb

Hash

hset user:1 name sam age 10 city atlanta
keys *
type user:1
hget user:1 name
hget user:1 age
hget user:1 city
hgetall user:1
hset user:2 birthYear 2020 status active
expire user:2 10
ttl user:2*
keys *
hkeys user:1
hvals user:1
hexists user:1 status
hexists user:1 age
hgetall user:1
hdel user:1 age
del user:1
keys *

List & Queue

rpush users sam mike jake
keys *
type users
llen users
lrange users 0 -1
lrange users 0 1
lpop users
llen users
rpush 1 2 3 4 5 6
llen users
keys *
rpush 1 2 3 4 5 6
lpop users
lpop users 2
lrange users 0 -1

List as lifo stack

flushdb
rpush users 1 2 3 4 5 6
llen users
lrange users 0 -1
rpop users
rpop users
rpop users
llen users
lrange users 0 -1
lpush users 4
keys *
lpop users
lpop users
lpop users
keys *
llen users
lpop users
keys *

Set

A redis set is an unordered collection of unique items (string) similar to a Java set.

Use cases

• maintain currently logged in users
• maintain blacklisted IP address / users
• set intersection

Basic commands

sadd users 1 2 3
sadd users 4
sadd users 5
scard users
smembers users
sadd users 4.5
sadd users 10
smembers users
sadd users 1
smembers users
sismember users 5
sismember users 100
srem users 100
srem users 5
sismember users 5
smembers users
spop users
spop users
scard users

Set intersection and union

flushdb
sadd skill:java 1 2 3 4
sadd skill:js 2 3 4
sadd skill:aws 4 5 6
sinter skill:java skill:js skill:aws
sunion skill:java skill js
sadd candidate:criminal 4 5 6
sdiff skill:java candidate:criminal

sinterstore java-js skill:java skill:js
keys *
scard java-js
smembers java-js