This document provides an introduction to Redis, describing it as a document-oriented, key-value data store program that uses RAM for data storage. Redis supports various data structures - strings, hashes, lists, sets and sorted sets - that allow for different operations like inserting and retrieving data. It also discusses features like replication, pub/sub messaging, and pipelining for improved performance. Redis is widely adopted by many large companies and platforms for use cases like caching, queues and more.

1. Introduction to Redis Byeongweon Moon / Redduck

2. Ready to Redis
• Document-oriented Database
• Key-Value Data Store Program
• Key can contain strings, hashes, lists, sets and
sorted sets
• Value can contain strings, lists, sets, sorted set
• Redis use RAM for data store

3. Key-Value Data Store
• Insert data with specific key
• Get data with key by O(1) compexity
• Value can contain structured strings like as JSON,
XML

4. List Control
• SET : LINSERT, LPUSH, RPUSH, LSET
• GET : LPOP, LRANGE, RPOP
• DEL : LREM
• ETC : LTRIM, LLEN

5. Pushing IDs instead of the actual data
$ redis-cli incr next.news.id
(integer) 1
$ redis-cli set news:1:title "Redis is simple"
OK
$ redis-cli set news:1:url
"http://code.google.com/p/redis"
OK
$ redis-cli lpush submitted.news 1
OK
$ redis-cli lrange submitted.news 0 -1
1) “1”

6. Set Control
• SET : SADD,
• GET : SPOP, SRANDMEMBER, SMEMBERS
• DEL : SREM
• ETC : SINTER, SUNION, SCARD, SDIFF, SMOVE,
SISMEMBER

7. Redis Sets
$ redis-cli sadd news:1000:tags 1
(integer) 1
$ redis-cli sadd news:1000:tags 2
(integer) 1
$ redis-cli sadd news:1000:tags 5
(integer) 1
$ redis-cli sadd tag:1:objects 1000
(integer) 1
$ redis-cli sadd tag:2:objects 1000
(integer) 1
$ redis-cli sadd tag:5:objects 1000
(integer) 1
$ redis-cli sinter tag:1:objects tag:2:objects tag:5:objects
1000
1) “1000”

8. Sorted Set Control
• SET : ZADD, ZINCRBY
• GET : ZRANGE, ZRANGEBYSCORE, ZSCORE,
ZCARD, ZRANK, ZCOUNT
• DEL : ZREM, ZREMRANGEBYRANK,
ZREMRANGEBYSCORE
• ETC : ZINTERSTORE, Z UNIONSTORE

9. Sorted sets
$ redis-cli zadd hackers 1940 "Alan Kay"
(integer) 1
$ redis-cli zadd hackers 1953 "Richard Stallman"
(integer) 1
$ redis-cli zadd hackers 1969 "Linus Torvalds"
(integer) 1
$ redis-cli zadd hackers 1912 "Alan Turing"
(integer) 1
$ redis-cli zrange hackers 0 -1
1. Alan Turing
2. Alan Kay
3. Richard Stallman
4. Linus Torvalds

10. Replication
• Master-Slave replication
• Master can have multiple slaves
• Slaves are able to accept other slaves
connections
• Slaves can also be connected to other slaves in
graph-like structure
• Redis replication is non-blocking on the master
side. but blocking on the slave side.

11. How replication works
• To configure add below line to slave's
configuration file slaveof IP PORT
• After configuration done. when upon connection
slave sends a SYNC command
• Master start background data saving and collect
all new commands received that will modify
dataset
• When background saving complete, transfers the
dataset to slave, then send saved commands

12. Publish / Subcribe
• Messaging pattern where senders of messages
do not program the messages to be sent directly
to specific receiver.
• SUBCRIBE [channel] command create channel or
subscribe channel
• PUBLISH [channel] [message] command send
message via
• Support pattern matching subscribe with
PSUBSCRIBE

13. Pipelining
• Whatever network speed fast or slow, there's
always latency.
• To avoid network latency. Redis support multi
commands send with one request.
• Send commands with new line delemiter
echo -en "PINGrnPINGrnPINGrn" | nc
localhost 6379
• Result wiil received after all commands processed

14. Benchmarks

15. Who's using Redis?
• Twitter
• github
• stackoverflow
• blizzard
• digg
• .....

16. Thanks, Any Questions?