By Josiah L. Carlson

In a nutshell
This ebook covers using Redis, an in-memory database/data constitution server, initially written via Salvatore Sanfilippo, yet lately patched in the course of the open resource technique. notwithstanding you don’t inevitably want to know something approximately Redis, to get the main out of this ebook you'll have no less than a modest familiarity with the Python programming language, considering that just about all of the examples use Python to engage with Redis.


Redis in Action introduces Redis and walks you thru examples that display tips on how to use it successfully. You'll commence by way of getting Redis manage correctly after which exploring the key-value version. Then, you'll dive into genuine use situations together with basic caching, dispensed advert focusing on, and extra. You'll how one can scale Redis from small jobs to giant datasets. skilled builders will enjoy chapters on clustering and inner scripting to make Redis more straightforward to use.

About the Technology

When you would like near-real-time entry to a fast-moving information move, key-value shops like Redis are easy methods to move. Redis expands at the key-value trend by way of accepting a large choice of knowledge forms, together with hashes, strings, lists, and different buildings. It presents lightning-fast operations on in-memory datasets, and in addition makes it effortless to persist to disk at the fly. Plus, it's unfastened and open source.

About this book

Redis in Action introduces Redis and the key-value version. You'll speedy dive into genuine use instances together with easy caching, disbursed advert concentrating on, and extra. You'll the way to scale Redis from small jobs to large datasets and detect find out how to combine with conventional RDBMS or different NoSQL shops. skilled builders will relish the in-depth chapters on clustering and inner scripting.

Written for builders conversant in database options. No earlier publicity to NoSQL database recommendations nor to Redis itself is needed. acceptable for platforms directors ok with programming.

What's Inside
• Redis from the floor up
• Preprocessing real-time data
• coping with in-memory datasets
• Pub/sub and configuration
• Persisting to disk

About the Author

Dr. Josiah L. Carlson is a pro database expert and an lively contributor to the Redis neighborhood.

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Extra resources for Redis in Action

Sample text

If there was a value to delete, DEL returns the number of items that were deleted. 1:6379> Start the redis-cli client up. Set the key hello to the value world. set hello world get hello del hello It’s still world, like we just set it. Let’s delete the key-value pair. get hello There’s no more value, so trying to fetch the value returns nil, which turns into None on the Python side. 10 CHAPTER 1 Getting to know Redis USING REDIS-CLI In this first chapter, I introduce Redis and some commands using the redis-cli interactive client that comes with Redis.

Though bulk inserts/updates/deletes can be performed faster, a customer will only be updating a small handful of rows for each web page view, so higher-speed bulk insertion doesn’t help here. At present, due to the relatively large load through the day (averaging roughly 1,200 writes per second, close to 6,000 writes per second at peak), Fake Web Retailer has had to set up 10 relational database servers to deal with the load during peak hours. It’s our job to take the relational databases out of the picture for login cookies and replace them with Redis.

Redis supports in-memory persistent storage on disk, replication to scale read performance, and client-side sharding 1 to scale write performance. That was a mouthful, but I’ll break it down by parts. 1 Redis compared to other databases and software If you’re familiar with relational databases, you’ll no doubt have written SQL queries to relate data between tables. Redis is a type of database that’s commonly referred to as NoSQL or non-relational. In Redis, there are no tables, and there’s no databasedefined or -enforced way of relating data in Redis with other data in Redis.

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