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Redis Cheat Sheet

H
HashedIn Technologies

This document serves as a cheat sheet for Redis objects, covering key aspects such as keys, values, and types including hashes, sets, lists, sorted sets, and strings. It highlights the functionalities of each type, including how to manipulate and access data efficiently. Use cases for each object type are provided to illustrate their practical applications.

Technology
Related topics:
data-structure • Data Modeling Techniques
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Redis​ ​Cheat​ ​Sheet  Objects​ ​in​ ​Redis  ● must​ ​have​ ​a​ ​key  ● keys​ ​are​ ​colon​ ​separated  ● value​ ​can​ ​be​ ​hash,​ ​set,​ ​list,​ ​sortedset,​ ​string  ● can​ ​have​ ​an​ ​expiry      Hashes:  ● Use​ ​to​ ​store​ ​"objects"​ ​from​ ​object​ ​oriented​ ​programming  "blogs:234":​ ​{ ​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​"id":​ ​234, ​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​"title":​ ​"Introduction​ ​to​ ​Redis", ​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​"views":​ ​1024 ​ ​​ ​​ ​​ ​​ ​​ ​} ● hmset​ ​blogs:234​ ​id​ ​234​ ​title​ ​"Introduction​ ​to​ ​Redis"​ ​views​ ​1024  ● hgetall​ ​blogs:234  ● hincrby​ ​blogs:234​ ​views​ ​1    Sets:  ● Only​ ​unique​ ​items.​ ​No​ ​duplicates  ● Elements​ ​are​ ​not​ ​ordered  ● Can​ ​check​ ​if​ ​element​ ​exists​ ​very​ ​quickly  ● Use​ ​case:​ ​Count​ ​unique​ ​items  ● Use​ ​case:​ ​Check​ ​if​ ​item​ ​exists  ● Use​ ​case:​ ​Perform​ ​logical​ ​UNION​ ​/​ ​INTERSECTION​ ​operations  ● Two​ ​ways​ ​to​ ​represent​ ​same​ ​information,​ ​choose​ ​based​ ​on​ ​use  case​ ​set​ ​of​ ​integers​ ​consumes​ ​less​ ​memory,​ ​is​ ​very​ ​efficient  "blogs:234:tags"​ ​==>​ ​set("aws",​ ​"redis",​ ​"cache") v/s "tags:aws:blogs"​ ​==>​ ​set(234,​ ​532,​ ​332) Lists:  ● Duplicates​ ​allowed.   ● Very​ ​well​ ​defined​ ​order​ ​of​ ​elements  ● Expensive​ ​to​ ​check​ ​if​ ​element​ ​already​ ​exists​ ​in​ ​list  ©​ ​2017​ ​HashedIn​ ​Technologies​ ​Pvt.​ ​Ltd. 
● Operations​ ​near​ ​head​ ​/​ ​tail​ ​very​ ​fast.  ● Operations​ ​near​ ​centre​ ​elements​ ​slower  ● Can​ ​use​ ​as​ ​a​ ​queue​ ​or​ ​a​ ​stack  ● Operations​ ​can​ ​block​ ​if​ ​no​ ​elements​ ​are​ ​available,​ ​useful  ● Easy​ ​to​ ​restrict​ ​length​ ​using​ ​ltrim​ ​command  ● Use​ ​case:​ ​Recent​ ​items,​ ​recent​ ​logs  ● Use​ ​case:​ ​Queue​ ​to​ ​maintain​ ​tasks    Sorted​ ​Sets  ● Like​ ​a​ ​set,​ ​only​ ​allows​ ​unique​ ​items  ● Every​ ​element​ ​can​ ​have​ ​a​ ​numeric​ ​score  ● Score​ ​can​ ​represent​ ​anything​ ​-​ ​sales,​ ​count​ ​of​ ​orders,​ ​points​ ​in  a​ ​game​ ​etc.  ● Elements​ ​are​ ​always​ ​maintained​ ​in​ ​order​ ​of​ ​score   ● If​ ​score​ ​of​ ​two​ ​elements​ ​are​ ​same,​ ​elements​ ​are​ ​sorted​ ​in  lexicographical​ ​order​ ​-​ ​the​ ​way​ ​you​ ​see​ ​in​ ​oxford's​ ​dictionary  ● Use​ ​case:​ ​Leader​ ​boards​ ​-​ ​Top​ ​10​ ​players,​ ​Products​ ​with​ ​least  sales,   ● Use​ ​case:​ ​Autocomplete​ ​API   Strings:  ● Strings​ ​are​ ​binary,​ ​and​ ​can​ ​store​ ​integers,​ ​floats,​ ​text  ● You​ ​can​ ​treat​ ​the​ ​string​ ​as​ ​a​ ​very​ ​large​ ​bitmap  ● You​ ​can​ ​split​ ​the​ ​string​ ​into​ ​smaller​ ​fields,​ ​and​ ​then​ ​set/get  each​ ​field​ ​using​ ​the​ ​bitfield​ ​command    ©​ ​2017​ ​HashedIn​ ​Technologies​ ​Pvt.​ ​Ltd. 

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Redis Cheat Sheet

  • 1. Redis​ ​Cheat​ ​Sheet  Objects​ ​in​ ​Redis  ● must​ ​have​ ​a​ ​key  ● keys​ ​are​ ​colon​ ​separated  ● value​ ​can​ ​be​ ​hash,​ ​set,​ ​list,​ ​sortedset,​ ​string  ● can​ ​have​ ​an​ ​expiry      Hashes:  ● Use​ ​to​ ​store​ ​"objects"​ ​from​ ​object​ ​oriented​ ​programming  "blogs:234":​ ​{ ​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​"id":​ ​234, ​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​"title":​ ​"Introduction​ ​to​ ​Redis", ​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​"views":​ ​1024 ​ ​​ ​​ ​​ ​​ ​​ ​} ● hmset​ ​blogs:234​ ​id​ ​234​ ​title​ ​"Introduction​ ​to​ ​Redis"​ ​views​ ​1024  ● hgetall​ ​blogs:234  ● hincrby​ ​blogs:234​ ​views​ ​1    Sets:  ● Only​ ​unique​ ​items.​ ​No​ ​duplicates  ● Elements​ ​are​ ​not​ ​ordered  ● Can​ ​check​ ​if​ ​element​ ​exists​ ​very​ ​quickly  ● Use​ ​case:​ ​Count​ ​unique​ ​items  ● Use​ ​case:​ ​Check​ ​if​ ​item​ ​exists  ● Use​ ​case:​ ​Perform​ ​logical​ ​UNION​ ​/​ ​INTERSECTION​ ​operations  ● Two​ ​ways​ ​to​ ​represent​ ​same​ ​information,​ ​choose​ ​based​ ​on​ ​use  case​ ​set​ ​of​ ​integers​ ​consumes​ ​less​ ​memory,​ ​is​ ​very​ ​efficient  "blogs:234:tags"​ ​==>​ ​set("aws",​ ​"redis",​ ​"cache") v/s "tags:aws:blogs"​ ​==>​ ​set(234,​ ​532,​ ​332) Lists:  ● Duplicates​ ​allowed.   ● Very​ ​well​ ​defined​ ​order​ ​of​ ​elements  ● Expensive​ ​to​ ​check​ ​if​ ​element​ ​already​ ​exists​ ​in​ ​list  ©​ ​2017​ ​HashedIn​ ​Technologies​ ​Pvt.​ ​Ltd. 
  • 2. ● Operations​ ​near​ ​head​ ​/​ ​tail​ ​very​ ​fast.  ● Operations​ ​near​ ​centre​ ​elements​ ​slower  ● Can​ ​use​ ​as​ ​a​ ​queue​ ​or​ ​a​ ​stack  ● Operations​ ​can​ ​block​ ​if​ ​no​ ​elements​ ​are​ ​available,​ ​useful  ● Easy​ ​to​ ​restrict​ ​length​ ​using​ ​ltrim​ ​command  ● Use​ ​case:​ ​Recent​ ​items,​ ​recent​ ​logs  ● Use​ ​case:​ ​Queue​ ​to​ ​maintain​ ​tasks    Sorted​ ​Sets  ● Like​ ​a​ ​set,​ ​only​ ​allows​ ​unique​ ​items  ● Every​ ​element​ ​can​ ​have​ ​a​ ​numeric​ ​score  ● Score​ ​can​ ​represent​ ​anything​ ​-​ ​sales,​ ​count​ ​of​ ​orders,​ ​points​ ​in  a​ ​game​ ​etc.  ● Elements​ ​are​ ​always​ ​maintained​ ​in​ ​order​ ​of​ ​score   ● If​ ​score​ ​of​ ​two​ ​elements​ ​are​ ​same,​ ​elements​ ​are​ ​sorted​ ​in  lexicographical​ ​order​ ​-​ ​the​ ​way​ ​you​ ​see​ ​in​ ​oxford's​ ​dictionary  ● Use​ ​case:​ ​Leader​ ​boards​ ​-​ ​Top​ ​10​ ​players,​ ​Products​ ​with​ ​least  sales,   ● Use​ ​case:​ ​Autocomplete​ ​API   Strings:  ● Strings​ ​are​ ​binary,​ ​and​ ​can​ ​store​ ​integers,​ ​floats,​ ​text  ● You​ ​can​ ​treat​ ​the​ ​string​ ​as​ ​a​ ​very​ ​large​ ​bitmap  ● You​ ​can​ ​split​ ​the​ ​string​ ​into​ ​smaller​ ​fields,​ ​and​ ​then​ ​set/get  each​ ​field​ ​using​ ​the​ ​bitfield​ ​command    ©​ ​2017​ ​HashedIn​ ​Technologies​ ​Pvt.​ ​Ltd.