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Applied Redis
Barcamp Saigon 2012
About me@hotrannam
KMS Technology
take away
fun
back to school
data structures
big O
do it right( data model & query performance )
redis???
data structureserver
data types
#1 strings#2 hashes#3 lists#4 sets#5 sorted sets
data examples
Keys
page:index.htmllogin_countusers_logged_in_todaylatest_post_idsuser:123:session
users_and_scores
Values
<html><head>[…] string7464{1, 2, 3, 4, 5} set[201, 204, 205] listtime => 10927353 hashusername => joejoe ~ 1348 sorted setfred ~ 938chris ~ 2832
command examples
SET my_key “my value”GET my_keyINCR next_post_idEXPIRE my_key 1234TTL my_keyDEL my_keyEXISTS my_key
HSET product:1 id 1HSET product:1 name “iPad”HSET product:1 available 10
field value
commands have its big O
( mostly )
and beyond
bring to life
#1 cache data
#2 who is online
# add to friends setSADD users:nam:friends duySADD users:nam:friends khoi# add to online setSADD online namSADD online nghiaSADD online khoi# get online friends – {khoi}SINTER users:nam:friends online
#3 leaderboard ( ranking )
# add to leaderboard (sorted set)ZADD leaderboard <score> <player># get top 5ZREVRANGEBYSCORE leaderboard +inf –inf WITHSCORES LIMIT 0 5# get rank of KhoiZREVRANK leaderboard Khoi# get 5 players around KhoiZREVRANGEBYSCORE leaderboard +inf –inf WITHSCORES LIMIT 2 5
max score
min score
countrank
#4 cross-app communication
# web appSUBSCRIBE chatPUBLISH chat “Hello! I’m web app.”
# mobile appSUBSCRIBE chatPUBLISH chat “Hi! I’m mobile app.”
channel
Thank you!
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