By Tiago Macedo, Fred Oliveira

Years considering that its preliminary liberate, Redis already has a powerful checklist of adopters, together with Engine backyard, GitHub, Craigslist, and Digg. This open resource information constitution server is outfitted for velocity and suppleness, making it excellent for lots of functions. If you're utilizing Redis, or contemplating it, this concise cookbook offers recipes for quite a few matters you're prone to face.

Each recipe solves a particular challenge, and offers an in-depth dialogue of the way the answer works. You’ll detect that Redis, whereas basic in nature, bargains large performance for manipulating and storing data.

- examine whilst it is smart to take advantage of Redis
- discover a number of equipment for fitting Redis
- hook up with Redis in a few methods, starting from the command line to well known languages corresponding to Python and Ruby
- remedy a number wishes, from associated datasets to analytics
- deal with backups, sharding, datasets better than to be had reminiscence, and plenty of different initiatives

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After validating all the data, we need to create a token and matching secret: HSET /request_tokens/key:dpf43f3p2l4k3l03 hh5s93j4hdidpola hdhd0244k9j7ao03 Implementing OAuth on Top of Redis | 23 Quick Reference for Authorization Algorithm HGETALL hash-name Returns all the key/value pairs in the given hash. SADD set-name element Adds the element to the given set unless it’s already a member. The return value is 1 if the element is added and 0 if it was already a member. EXPIRE key seconds Sets an expiration timeout on a key, after which it will be deleted.

Quick Reference for Inverted-Index Algorithm ZINCRBY zset-name increment element Adds or increments the score of an element in a sorted set. As with ZADD and SADD, the set will be created if it doesn’t exist. ]] [AGGREGATE SUM | MIN | MAX] Gets the intersection of a given number of ZSETS and store the result in a new ZSET. It’s also possible to pass along a muliplication factor for each ZSET (WEIGHTS) or to specify the aggregation function. By default, it’s a sum of the scores in all the sets, but it can also be the maximum or minimum value.

Lrange("queue:#{queue_name}", 0, 0) end Notice how we just delete the list (instead of using LTRIM) from Redis when emptying the queue. This isn’t a problem as Redis treats a nonexisting value as an empty queue. In fact, using the length function after emptying the queue with del will return 0. Beware that removing a single element from a list isn’t cheap. Because lists are optimized for head and tail access, in order to remove an element from the middle of the list, Redis will have to iterate through it.

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