Downloaded 47 times
![Redis – Lists Commands
LPOP key / LPUSH key value1 [value2]
RPOP key / RPUSH key value1 [value2]
BLPOP key1 [key2 ] timeout
BRPOP key1 [key2 ] timeout
BRPOPLPUSH source destination timeout
LINDEX key index
LINSERT key BEFORE|AFTER pivot value
LLEN key](https://image.slidesharecdn.com/introductiontoredisgrailsapp-150804034055-lva1-app6892/75/Introduction-to-redis-29-2048.jpg)
![Redis – Lists Commands (Cont..)
LPUSHX key value
LRANGE key start stop
LREM key count value
LSET key index value
LTRIM key start stop
RPOP key / RPUSH key value1 [value2]
RPOPLPUSH source destination
RPUSHX key value](https://image.slidesharecdn.com/introductiontoredisgrailsapp-150804034055-lva1-app6892/75/Introduction-to-redis-30-2048.jpg)
![Redis – Sets Commands
SADD key member1 [member2] / SPOP key
SREM key member1 [member2]
SCARD key
SDIFF key1 [key2]
SDIFFSTORE destination key1 [key2]
SINTER key1 [KEY2]
SINTERSTORE destination key1 [key2]
SUNION key1 [key2]
SUNIONSTORE destination key1 [key2]](https://image.slidesharecdn.com/introductiontoredisgrailsapp-150804034055-lva1-app6892/75/Introduction-to-redis-34-2048.jpg)
![Redis – Sets Commands (Cont..)
SISMEMBER key member
SMEMBERS key
SRANDMEMBER key [count]
SMOVE source destination member
SSCAN key cursor [MATCH pattern]](https://image.slidesharecdn.com/introductiontoredisgrailsapp-150804034055-lva1-app6892/75/Introduction-to-redis-35-2048.jpg)
![Redis – Sorted Sets Commands
ZADD key score1 member1 [score2 member2]
ZCARD key
ZCOUNT key min max
ZINCRBY key increment member
ZINTERSTORE destination numkeys key [key ...]
ZRANGE key start stop WITHSCORES
ZRANGEBYSCORE key min max [WITHSCORES] [LIMIT]
ZRANK key member](https://image.slidesharecdn.com/introductiontoredisgrailsapp-150804034055-lva1-app6892/75/Introduction-to-redis-39-2048.jpg)
![Redis – Sorted Sets Commands (Cont..)
ZREM key member [member ...]
ZREMRANGEBYRANK key start stop
ZREMRANGEBYSCORE key min max
ZREVRANGE key start stop [WITHSCORES]
ZREVRANGEBYSCORE key max min [WITHSCORES]
ZREVRANK key member
ZSCORE key member
ZUNIONSTORE destination numkeys key [key ...]
ZSCAN key cursor [MATCH pattern]](https://image.slidesharecdn.com/introductiontoredisgrailsapp-150804034055-lva1-app6892/75/Introduction-to-redis-40-2048.jpg)
![Redis – Pub Sub Commands
PUBLISH channel message
SUBSCRIBE channel [channel...]
PSUBSCRIBE pattern [pattern2...]
PUBSUB subcommand [argument [argument]]
UNSUBSCRIBE [channel [channel...]]
PUNSUBSCRIBE [pattern [pattern...]]](https://image.slidesharecdn.com/introductiontoredisgrailsapp-150804034055-lva1-app6892/75/Introduction-to-redis-43-2048.jpg)
![Redis – Transactions Commands
DISCARD
EXEC
MULTI
UNWATCH
WATCH key [key...]](https://image.slidesharecdn.com/introductiontoredisgrailsapp-150804034055-lva1-app6892/75/Introduction-to-redis-45-2048.jpg)
![Redis – Benchmarks
Utility to check the performance of redis
Running n commands simultaneously
redis-benchmark [option] [option value]
redis-benchmark -n 100000
redis-benchmark -h 127.0.0.1 -p 6379 -t set,lpush -n 100000 -q
SET: 146198.83 requests per second
LPUSH: 145560.41 requests per second](https://image.slidesharecdn.com/introductiontoredisgrailsapp-150804034055-lva1-app6892/75/Introduction-to-redis-54-2048.jpg)
Uploaded byTanu Siwag
Introduction to redis
This document provides an overview and introduction to Redis, including: - Redis is an open source, in-memory data structure store that can be used as a database, cache, and message broker. - It supports common data structures like strings, hashes, lists, sets, sorted sets with operations like GET, SET, LPUSH, SADD. - Redis has advantages like speed, rich feature set, replication, and persistence to disk. - The document outlines how to install and use Redis, and covers additional features like pub/sub, transactions, security and backup.
More Related Content
Introduction to redis
- 1. An Introduction to By:Tanu Siwag & Deepak Kr Mittal
- 2. Agenda Overview Redis Advantages Comparision withother key-value storage Environment Setup - Install Redis Redis - Data Types : Strings, Hashes, Lists, Sets, Sorted Sets Redis Keys and Key Commands
- 3. Agenda (Cont...) Pub-Sub Transactions Redis -Connections Redis – Backup Redis – Security Benchmark
- 4. What is Redis? REmoteDIctionary Server (Data Structure server) Redis is an open source, advanced key-value store Written in c Solution for building high-performance, scalable web applications. In-memory storage,with persistence. Rich set of data types Redis can replicate data to any number of slaves.
- 5. Who all areusing Redis?
- 6. Why Redis? Simple tolearn Lightweight text-based tcp protocol Extremely fast and versatile - in RAM Rapidly growing Widely supported (C, .NET, PHP, Java... more) Disk-backed, Background writes! Master-Slave configurations Open source , awesome community
- 7. Advantages of Redis ExceptionallyFast (110000 SETs per second, 81000 GETs per second) Supports Rich data types Snapshots Atomic Operations Replication Sharding MultiUtility Tool (caching, messaging-queues, any short lived data in application like web application sessions, web page hit counts, etc)
- 8. Comparision with otherkey-value stores Complex data types, with atomic operations Redis is an in-memory but persistent on disk database very high write and read speed Memory representation of complex data structures is much simpler Little internal complexity.
- 9. Memcache Vs Redis MemcachedRedis Description In-memory key-value store, originally intended for caching In-memory database with configurable options performance vs. persistency Initial release 2003 2009 Transaction concepts none optimistic locking Partitioning methods none Sharding Durability no yes Replication methods none Master-slave replication
- 10. Memcache Vs Redis MemcachedRedis Memory Usage For simple key-value pairs memcached is more memory efficient than Redis If use Redis hashes, then Redis is more memory efficient. Persistence Data lost with a restart & rebuilding cache is a costly process Persistent data. Redis syncs to disk at every 2 seconds. Storage Type Stores variables in memory Database that resides in memory Read/ Write Speed Heavy Read Heavy Read & Write Key Length 250 bytes max 2 GB max Data Structure String & integer Object: serialize stronger data structures
- 11. Install Redis onUbuntu $sudo apt-get install redis-server Check if redis is working? $redis-cli Run commands on remote server redis-cli -h host -p port -a password
- 12. Install Redis onUbuntu $ wget http://redis.googlecode.com/files/redis-2.4.2.tar.gz $ tar xzf redis-2.4.2.tar.gz $ cd redis-2.4.2 $ make Start Redis: redis-server
- 13. Install Redis DesktopManager on Ubuntu Will provide UI to manage your redis keys and data. Download from : http://redisdesktop.com/download Install the downloaded file
- 14. Ping – PongGame Install Redis on your systems
- 15. Redis Key Commands SET GET DEL DUMP(serialized version) EXISTS EXPIRE key seconds EXPIREAT key timestamp PEXPIRE key milliseconds
- 16. Redis Key Commands(Cont..) PEXPIREAT key milliseconds-timestamp KEYS pattern MOVE key db (move key to another db) PERSIST (Remove expiration) TTL (Remaining time in key expiry) PTTL (Remaining time in key expiry in milliseconds) RANDOMKEY RENAME key newkey (RENAMENX) TYPE key
- 17. Key => { Data Structures } KEYKEY ““I am aplain text string”I am a plain text string” C A A B DC A A B D A B C D EA B C D E A : 0.1 B : 0.2 C : 50 D : 50A : 0.1 B : 0.2 C : 50 D : 50 KEY 1KEY 1 KEY 2KEY 2 Value 1Value 1 Value 2Value 2 Hash Tables (objects) Strings/Bitmaps Lists Sets Sorted Sets String
- 18.
- 19. Redis – String Formanaging Strings values Sequence of bytes Binary safe Max 512 Megabytes in length
- 20. Redis – String RedisKey Value: Redis String String (512 MB max)
- 21. Redis – StringCommands GET/SET GETRANGE key start end GETSET key value MGET key1 key2 / MSET key1 val1 key2 val2 SETEX key seconds value / PSETEX SETNX key value / MSETNX SETRANGE key offset value STRLEN key
- 22. Redis – StringCommands (Cont..) EXISTS key DEL key INCR key / DECR INCRBY key inc / DECRBY INCRBYFLOAT key inc APPEND key value
- 23. Redis – Hashes Collectionof key value pair Maps b/w string fields and string values Used to represent objects Can store upto more thn 4 billion field-value pairs
- 24. Redis – Hashes RedisKey Field1 Field3 Value3 Value2 Value1 Field2 Value : Redis Hash
- 25. Redis – HashesCommands HSET key field val /HMSET HGET key field /HMGET key field1 field2 HGETALL key HDEL key field1 field2 HEXISTS key field HINCRBY key field inc / HINCRBYFLOAT HKEYS key HLEN key HSETNX key field value HVALS key HSCAN
- 26. Redis – HashesExample redis 127.0.0.1:6379> HMSET session name "Intro to redis" description "redis basic commands for caching" attendees 20 absent 5 OK redis 127.0.0.1:6379> HGETALL session 1) "name" 2) "Intro to redis" 3) "description" 4) "redis basic commands for caching" 5) "attendees" 6) "20" 7) "absent" 8) "5"
- 27. Redis – Lists Listof strings, sorted by insertion order Can add elements on head or on tail Maximum length of a list is 232 - 1 elements (4294967295, more than 4 billion of elements per list)
- 28. Redis – Lists RedisKey HEAD Value2 Value4 TAIL Value3 Value1 Value : Redis List
- 29. Redis – ListsCommands LPOP key / LPUSH key value1 [value2] RPOP key / RPUSH key value1 [value2] BLPOP key1 [key2 ] timeout BRPOP key1 [key2 ] timeout BRPOPLPUSH source destination timeout LINDEX key index LINSERT key BEFORE|AFTER pivot value LLEN key
- 30. Redis – ListsCommands (Cont..) LPUSHX key value LRANGE key start stop LREM key count value LSET key index value LTRIM key start stop RPOP key / RPUSH key value1 [value2] RPOPLPUSH source destination RPUSHX key value
- 31. Redis – ListsExample redis 127.0.0.1:6379> lpush sessionList redis (integer) 1 redis 127.0.0.1:6379> lpush sessionList mongodb (integer) 2 redis 127.0.0.1:6379> lpush sessionList rabitmq (integer) 3 redis 127.0.0.1:6379> lrange sessionList 0 10 1) "rabitmq" 2) "mongodb" 3) "redis"
- 32. Redis – Sets Unorderedcollection of unique strings Can add, remove and test for existence Diff, intersect, merge Maximum length of a list is 232 - 1 elements (4294967295, more than 4 billion of elements per set)
- 33. Redis – Sets RedisKey Value2 Value4 Value3 Value1 Value : Redis Set
- 34. Redis – SetsCommands SADD key member1 [member2] / SPOP key SREM key member1 [member2] SCARD key SDIFF key1 [key2] SDIFFSTORE destination key1 [key2] SINTER key1 [KEY2] SINTERSTORE destination key1 [key2] SUNION key1 [key2] SUNIONSTORE destination key1 [key2]
- 35. Redis – SetsCommands (Cont..) SISMEMBER key member SMEMBERS key SRANDMEMBER key [count] SMOVE source destination member SSCAN key cursor [MATCH pattern]
- 36. Redis – SetsExample redis 127.0.0.1:6379> SADD sessionSet redis (integer) 1 redis 127.0.0.1:6379> SADD sessionSet mongodb (integer) 1 redis 127.0.0.1:6379> SADD sessionSet rabitmq (integer) 1 redis 127.0.0.1:6379> SADD sessionSet rabitmq (integer) 0 redis 127.0.0.1:6379> SMEMBERS sessionSet 1) "rabitmq" 2) "mongodb" 3) "redis"
- 37. Redis – SortedSets Similar to Set Every member of a Sorted Set is associated with score, that is used in order to take the sorted set ordered, from the smallest to the greatest score. Ordered by score Members are unique, scores may be repeated. Can add, remove and test for existence Maximum length of a list is 232 - 1 elements (4294967295, more than 4 billion of elements per set)
- 38. Redis – SortedSets Redis Key Score 100 Value2 Score 300 Value1 Score 300 Value4 Score 50 Value3 Value : Redis Sorted Set
- 39. Redis – SortedSets Commands ZADD key score1 member1 [score2 member2] ZCARD key ZCOUNT key min max ZINCRBY key increment member ZINTERSTORE destination numkeys key [key ...] ZRANGE key start stop WITHSCORES ZRANGEBYSCORE key min max [WITHSCORES] [LIMIT] ZRANK key member
- 40. Redis – SortedSets Commands (Cont..) ZREM key member [member ...] ZREMRANGEBYRANK key start stop ZREMRANGEBYSCORE key min max ZREVRANGE key start stop [WITHSCORES] ZREVRANGEBYSCORE key max min [WITHSCORES] ZREVRANK key member ZSCORE key member ZUNIONSTORE destination numkeys key [key ...] ZSCAN key cursor [MATCH pattern]
- 41. Redis – SortedSets Example redis 127.0.0.1:6379> ZADD sessionscore 1 redis (integer) 1 redis 127.0.0.1:6379> ZADD sessionscore 2 mongodb (integer) 1 redis 127.0.0.1:6379> ZADD sessionscore 3 rabitmq (integer) 1 redis 127.0.0.1:6379> ZADD sessionscore 4 rabitmq (integer) 0 redis 127.0.0.1:6379> ZRANGE sessionscore 0 10 WITHSCORE 1) "redis" 2) “1” 3) "mongodb"
- 42. Redis – PublishSubscribe Messaging system The link by which messages are transferred is called channel A client can subscribe any number of channels. redis 127.0.0.1:6379> SUBSCRIBE redisChat redis 127.0.0.1:6379> PUBLISH redisChat "Redis is a great caching technique"
- 43. Redis – PubSub Commands PUBLISH channel message SUBSCRIBE channel [channel...] PSUBSCRIBE pattern [pattern2...] PUBSUB subcommand [argument [argument]] UNSUBSCRIBE [channel [channel...]] PUNSUBSCRIBE [pattern [pattern...]]
- 44. Redis – Transactions Allowthe execution of a group of commands in a single step Two properties: − All commands are serialized and executed sequentially − Either all commands or no commands are processed Iinitiated by command MULTI Executed by EXEC command
- 45. Redis – TransactionsCommands DISCARD EXEC MULTI UNWATCH WATCH key [key...]
- 46. Redis – Connections Tomanage client connections with redis server
- 47. Redis – ConnectionCommands AUTH password ECHO message PING QUIT SELECT index
- 48. Redis Configuration Redis.conf availableat root directory of redis. CONFIG GET * CONFIG SET CONFIG_SETTING_NAME NEW_CONFIG_VALUE
- 49. Redis – Security Redisdatabase can be make secured Making connection needs to authenticate before executing command. 127.0.0.1:6379> CONFIG get requirepass
- 50. Redis – SecurityCommands 127.0.0.1:6379> CONFIG set requirepass "intellimeet" 127.0.0.1:6379> CONFIG get requirepass 1) "requirepass" 2) "intellimeet" NOAUTH Authentication required error Client needs to use AUTH command to authenticate himself. 127.0.0.1:6379> AUTH "intellimeet" 127.0.0.1:6379> SET mykey "Test value" 127.0.0.1:6379> GET mykey "Test value"
- 51. Redis – Backup SAVEcommand is used to create back up of current redis database This command will create dump.rdb file in your redis directory. To restore redis data just move redis backup file (dump.rdb) into your redis directory and start the server. CONFIG get dir : to get redis directory
- 52. Redis – Backup(Cont..) BGSAVE start the backup process and run in background Default configuration: − Save after 900 sec (15 min) if at least 1 key changed − Save after 300 sec (5 min) if at least 10 keys changed − Save after 60 sec if at least 10000 keys changed
- 53. Redis – Someother useful Commands DBSIZE SELECT FLUSHALL FLUSHDB INFO LASTSAVE (Last unsuccessful save) MONITOR SHUTDOWN SLAVEOF
- 54. Redis – Benchmarks Utilityto check the performance of redis Running n commands simultaneously redis-benchmark [option] [option value] redis-benchmark -n 100000 redis-benchmark -h 127.0.0.1 -p 6379 -t set,lpush -n 100000 -q SET: 146198.83 requests per second LPUSH: 145560.41 requests per second
- 55. Why not Redis? SingleThreaded Significant overhead for persistence Pick your risk level Vs performance If your db is too big - redis can handle swapping on its own. Keys remain in memory and least used values are swapped to disk. Swapping IO happens in separate threads But if you need this - don't use redis, or get a bigger machine ;)
- 56. Redis Commands Link http://redis.io/commands TryRedis- in real time − http://try.redis-db.com
- 57. Other use caseideas Geo Resolving with geohashing − Implemented and opened by yours truly https://github.com/doat/geodis Real time analytics − use ZSET, SORT, INCR of values API Key and rate management − Very fast key lookup, rate control counters using INCR Real time game data − ZSETs for high scores, HASHES for online users, etc Database Shard Index − map key => database id. Count size with SETS