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Róbert Móro

Róbert Móro. redis. In-memory key-value store Master-slave replication Persistence RDB (snapshots) AOF (append-only log file) Supported languages Ruby, Python, Java, C, PHP, Javascript (Node.js). redis. Data types String, List, Set, Hash, Sorted set Used in

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Róbert Móro

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  1. Róbert Móro

  2. redis • In-memory key-value store • Master-slave replication • Persistence • RDB (snapshots) • AOF (append-only log file) • Supported languages • Ruby, Python, Java, C, PHP, Javascript (Node.js)

  3. redis • Data types • String, List, Set, Hash, Sorted set • Used in • Engine Yard, Github, stackoverflow, …

  4. redis • Data types • String, List, Set, Hash, Sorted set • Used in • Engine Yard, Github, stackoverflow, … ALEF

  5. redis data types • String • can contain any kind of data, for instance a JPEG image or a serialized object • INCR, DECR, APPEND, ... • List • lists of strings, sorted by insertion order • LPUSH, RPUSH, ...

  6. redis data types • Set • an unordered collection of Strings • it is possible to add, remove, and test for existence of members in O(1) • SADD, SUNION, SINTER, SDIFF, SCARD, ... • Hash • maps between string fields and string values • HGETALL, HSET, HMSET, HKEYS, HVALS, ...

  7. redis data types • SortedSet • non-repeating collections of Strings similar to Set • every member of a Sorted Set is associated with score • scores may be repeated • members of Sorted Set are ordered by their score • ZRANGE, ZRANK, ZSCORE, ZCOUNT, ...

  8. When to use redis? • Speed is critical • Data can be contained in RAM • Loss of some data is acceptable • http://redis.io

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