RediSearch is a powerful Redis module for full-text and secondary indexing, that can scale to billions of documents and deliver super fast performance for real time indexing and searching. An overview of how it works and how it can scale to huge clusters.

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Redis has no built in
concept of indexing
or search, duh!
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5. Indexing
Process
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Key
"I'm a Plain Text String!"
{ A: “foo”, B: “bar”, C: “baz” }
{ A , B , C , D , E }
[ A → B → C → D → E ]
{ A: 0.1, B: 0.3, C: 100, D: 1337 }
{ A: (51.5, 0.12), B: (32.1, 34.7) }
00110101 11001110 10101010
Looks like a
set will do!
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● redis> SADD hello doc1
redis> SADD world doc1
redis> SINTER hello world
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8. > ZADD hello 1.0 doc1 0.5 doc2
> ZADD world 1.0 doc 0.5 doc2
> ZINTERSTORE hw 2 hello world
> ZRANGE hw 0 -1
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14. > FT.CREATE products SCHEMA title TEXT price NUMERIC
> FT.ADD products prod1 1.0 FIELDS title "Toshiba 32 LCD TV" price 250
> FT.ADD products prod2 1.0 FIELDS title "Samsung 42 LCD TV" price 350
> FT.SEARCH products "lcd tv"
1) (integer) 2
2) "prod1"
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4) "prod2"
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> FT.SEARCH products "lcd tv" FILTER price 300 400
1) (integer) 1
"prod2"
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15. Key
[prod1, prod2, …]
{title:“Toshiba 32 LCD TV”, …}
{200..400: [prod1, prod2, …]… }
Toshib*
{ A: (51.5, 0.12), B: (32.1, 34.7) }
{1: prod1, 2: prod2, …}
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17. FT.SEARCH {index} {query} [NOCONTENT] [VERBATIM]
[NOSTOPWORDS] [WITHSCORES] [WITHPAYLOADS]
[FILTER {numeric_field} {min} {max}] ...
[GEOFILTER {geo_field} {lon} {lat} {raius} m|km|mi|ft]
[INKEYS {num} {key} ... ]
[INFIELDS {num {field} ... ]
[SLOP {slop}] [INORDER]
[LANGUAGE {language}]
[EXPANDER {expander}]
[SCORER {scorer}]
[PAYLOAD {payload}]
[SORTBY {field} [ASC|DESC]]
[LIMIT offset num]
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INTERSECT
UNION Obama
Barack Barrack
Date: 2010-2016
Scoring function
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40. FT.SEARCH idx “foo”

41. FT.SEARCH idx “foo”

43. FT.SEARCH idx “foo”

44. FT.SEARCH idx “foo”

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