Search icon Close icon
Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Save more on your purchases! discount-offer-chevron-icon
Savings automatically calculated. No voucher code required.
Checkout

Change country

Modal Close icon
Country selected Country selected
country flag United States
Country selected
country flag Great Britain
Country selected
country flag India
Country selected
country flag Germany
Country selected
country flag France
Country selected
country flag Canada
Country selected
country flag Russia
Country selected
country flag Spain
Country selected
country flag Brazil
Country selected
country flag Australia
Country selected
country flag Singapore
Country selected
country flag Hungary
Country selected
country flag Ukraine
Country selected
country flag Luxembourg
Country selected
country flag Estonia
Country selected
country flag Lithuania
Country selected
country flag South Korea
Country selected
country flag Turkey
Country selected
country flag Switzerland
Country selected
country flag Colombia
Country selected
country flag Taiwan
Country selected
country flag Chile
Country selected
country flag Norway
Country selected
country flag Ecuador
Country selected
country flag Indonesia
Country selected
country flag New Zealand
Country selected
country flag Cyprus
Country selected
country flag Denmark
Country selected
country flag Finland
Country selected
country flag Poland
Country selected
country flag Malta
Country selected
country flag Czechia
Country selected
country flag Austria
Country selected
country flag Sweden
Country selected
country flag Italy
Country selected
country flag Egypt
Country selected
country flag Belgium
Country selected
country flag Portugal
Country selected
country flag Slovenia
Country selected
country flag Ireland
Country selected
country flag Romania
Country selected
country flag Greece
Country selected
country flag Argentina
Country selected
country flag Netherlands
Country selected
country flag Bulgaria
Country selected
country flag Latvia
Country selected
country flag South Africa
Country selected
country flag Malaysia
Country selected
country flag Japan
Country selected
country flag Slovakia
Country selected
country flag Philippines
Country selected
country flag Mexico
Country selected
country flag Thailand
Country selected
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Free Learning
Arrow right icon
Home > Data > Database Programming > Mastering Redis
Mastering Redis
Mastering Redis

Mastering Redis: Take your knowledge of Redis to the next level to build enthralling applications with ease

Arrow left icon
Profile Icon Nelson Profile Icon Vidyasagar N V
Arrow right icon
$60.99
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.3 (3 Ratings)
Paperback May 2016 366 pages 1st Edition
eBook
$9.99 $47.99
Paperback
$60.99
Subscription
Free Trial
Renews at $19.99p/m
Arrow left icon
Profile Icon Nelson Profile Icon Vidyasagar N V
Arrow right icon
$60.99
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.3 (3 Ratings)
Paperback May 2016 366 pages 1st Edition
eBook
$9.99 $47.99
Paperback
$60.99
Subscription
Free Trial
Renews at $19.99p/m
eBook
$9.99 $47.99
Paperback
$60.99
Subscription
Free Trial
Renews at $19.99p/m

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
OR

Contact Details

Modal Close icon
Payment Processing...
tick Completed

Shipping Address

Billing Address

Shipping Methods
Table of content icon View table of contents Preview book icon Preview Book

Mastering Redis

Chapter 2. Advanced Key Management and Data Structures

Using Redis as data storage in your application starts by considering two sides of the solution: the keys and the data structures used as the key values in Redis. Coming up with a good Redis key schema, syntax, and naming convention can mean the difference between an effective and sustainable solution and a technological mess. Because of the flexibility that Redis gives you by allowing most string serialization as keys, much more intentional thought and design should be given to this important step in designing a Redis-based project. Likewise, using an appropriate data structure for any particular key also directly impacts the usability and functionality of any application built with Redis. This chapter covers the following:

  • Designing and managing a Redis key schema and the associated data structures
  • Using Redis client object mappers that use different strategies that hide the specific key schemas and data structures
  • Creating...

Redis keys

Effectively, using Redis in your application involves understanding how Redis stores keys and the operations to manipulate the key space within a Redis instance. Running a 32-bit or 64-bit version of Redis dictates the practical limits to the size of your Redis keys. For the 32-bit Redis variant, any key name larger than 32 bits requires the key to span multiple bytes, thereby increasing the Redis memory usage. Using 64-bit Redis allows for larger key lengths but has the downside that keys with small lengths will be allocated the full 64 bits, wasting the extra bits that are not allocated to the key name.

The flexibility of Redis allows for a wide diversity in how keys are structured and stored. The performance and maintainability of Redis can be either positively or negatively impacted by the choices made in designing and constructing the Redis keys used in your database. A good general practice when designing your Redis keys is to construct at least a rough outline of what...

Manually creating a Redis schema

This graphic outlines our basic scenario of a simple two-product online storefront from which we will construct our Redis schema.

Manually creating a Redis schema

Imagine that you have an online storefront selling paper products and you want to manage different stationary products that are offered for sale. Embedded within this seemingly simple business need, the following narrative starts with these separate steps:

  1. An online customer comes to our website looking to buy paper stationery.
  2. We offer two choices of paper stationery: a blue rectangle package of 20 sheets printed on rice paper and a red square, and a 15-sheet stationery package also printed on rice paper.
  3. The basic entity in our example is a package of stationery that has three basic properties: color, height, width, and number of sheets. (Until we start selling paper stationery made out of non-rice paper, we will ignore material as a property. Another future enhancement would be to add a more friendly, human name for each stationery...

Deconstructing a Redis object mapper

Redis's rich ecosystem offers a number of object mappers for Redis that hide the key naming management from the designer and the user while offering, through client-side code, a functionality that may be present in other data storage technologies. Examining how a Redis object mapper implements this functionality with a particular pattern of keys and data structures can help you learn about existing patterns and allow you to extend and improve your own Redis-based applications. Using a Redis object mapper can also be helpful if you do not want to re-implement a functionality that may already exist and run it in production environments in your code base. A few of the more popular programming languages have these object mapper projects that all provide ways to persist object semantics and data in Redis while offering more object-oriented methodologies and techniques for the developer who may be more familiar with these techniques and ideas in their...

Big O notation

As you may already know and fully appreciate, Salvatore Sanfilippo intentionally documents the worst-case algorithmic performance of each Redis command on Redis's website at http://redis.io/commands/. This focus on an algorithmic measure of performance as a core actionable metric differentiates Redis from the other data storage technologies. A mathematical definition of Big O is that it "symbolically expresses the asymptotic behavior of a given function.2. Within computer science and more pertinent to our understanding of the big O notation within Redis, with this notation and understanding, we can classify the performance of a Redis command by how the commands perform with increasing inputs to the command over time.

Big O notation

Graphing Big O Notation

In the Redis documentation for each command, the time complexity of each Redis command is given in these big O cases:

  • The O(1) case in the big O notation is shorthand for increasing the number of inputs that do not change the time...

Reviewing the time complexity of Redis data structures

With this understanding of the computing big notation, we'll next briefly review Redis's basic data structures, paying attention to the time complexity implications of using the data structure with the current commands supported by Redis.

Strings

The most basic data structure for Redis values is a string, the same data type as a Redis key. Using Redis at its simplest is as a string-to-string key-value storage. Note that Redis has similar performance characteristics to other key-value data storage solutions such as Memecached3.

In Redis, a string does not merely contain alphanumeric characters as strings are normally understood to be in higher-level programming languages, but contain serialized characters in C, the principal programming language used in Redis. The most basic GET and SET commands for Redis strings are O(1) operations, making Redis extremely fast as a simple key-value store. The speed and ease of using GET and SET...

Sorted sets

In Redis, the sorted-set data type combines the characteristics of both Redis lists and sets. Similarly to those of a Redis list, a sorted set's values are ordered, and like a set, each value is assured to be unique. Of all the various data structures in Redis, the sorted set is the closest to a killer feature. The flexibility of a sorted set allows for multiple types of access patterns depending on the needs of the application. Using a single sorted set for a player's scores in a game both the top and the bottom players are easily fetched for a leaderboard by either the ZRANGE or ZREVRANGE Redis commands.

For sorted sets, the ZADD command adds a member with a score to the sorted set. The time complexity of ZADD is O(log(n)), meaning that as the size of the sorted set increases, the rate of increase in the processing time is a constant. Therefore, the difference between adding a new member to a large sorted set is trivial; the difference between log(10000) ~ 9.21034037...

Advanced sorted set operations

Similarly to sets, sorted sets in Redis support the set operations of union and intersection, although the time complexity of these operations for sorted sets is worse than for sets. Another problem with the sorted set operations is that when using a Redis cluster, union and intersection operations can only be used when the sorted set keys have been sharded to the same hash slot and run on the same node. The ZINTERSTORE Redis command has a time complexity of O(nk)+O(mlog(m)), where n is the size of the smallest sorted set; k, the total number of sorted sets being intersected, and m, the number of elements in the resulting final sorted set. Likewise, for the ZUNIONSTORE command, the time complexity is O(n)+O(M log(M)) with n being the total size of all the sorted sets and m being the total number of elements in the final sorted set. Given the characteristics of sorted sets, the additional time required for these two set operations may be an acceptable trade...

Redis keys

Effectively, using Redis in your application involves understanding how Redis stores keys and the operations to manipulate the key space within a Redis instance. Running a 32-bit or 64-bit version of Redis dictates the practical limits to the size of your Redis keys. For the 32-bit Redis variant, any key name larger than 32 bits requires the key to span multiple bytes, thereby increasing the Redis memory usage. Using 64-bit Redis allows for larger key lengths but has the downside that keys with small lengths will be allocated the full 64 bits, wasting the extra bits that are not allocated to the key name.

The flexibility of Redis allows for a wide diversity in how keys are structured and stored. The performance and maintainability of Redis can be either positively or negatively impacted by the choices made in designing and constructing the Redis keys used in your database. A good general practice when designing your Redis keys is to construct at least a rough outline of what information...

Manually creating a Redis schema

This graphic outlines our basic scenario of a simple two-product online storefront from which we will construct our Redis schema.

Imagine that you have an online storefront selling paper products and you want to manage different stationary products that are offered for sale. Embedded within this seemingly simple business need, the following narrative starts with these separate steps:

  1. An online customer comes to our website looking to buy paper stationery.

  2. We offer two choices of paper stationery: a blue rectangle package of 20 sheets printed on rice paper and a red square, and a 15-sheet stationery package also printed on rice paper.

  3. The basic entity in our example is a package of stationery that has three basic properties: color, height, width, and number of sheets. (Until we start selling paper stationery made out of non-rice paper, we will ignore material as a property. Another future enhancement would be to add a more friendly, human name for each stationery...

Deconstructing a Redis object mapper

Redis's rich ecosystem offers a number of object mappers for Redis that hide the key naming management from the designer and the user while offering, through client-side code, a functionality that may be present in other data storage technologies. Examining how a Redis object mapper implements this functionality with a particular pattern of keys and data structures can help you learn about existing patterns and allow you to extend and improve your own Redis-based applications. Using a Redis object mapper can also be helpful if you do not want to re-implement a functionality that may already exist and run it in production environments in your code base. A few of the more popular programming languages have these object mapper projects that all provide ways to persist object semantics and data in Redis while offering more object-oriented methodologies and techniques for the developer who may be more familiar with these techniques and ideas in their preferred...

Left arrow icon

Page 1 of 11

Right arrow icon
Download code icon Download Code

Key benefits

  • Detailed explanation on Data structure server with powerful strings, lists, sets, sorted-sets, and hashes
  • Learn to Scale your data with Redis Cluster’s distributed setup
  • This is a fast paced practical guide full of screenshots and real work examples to help you get to grips with Redis in no time.

Description

Redis is the most popular, open-source, key value data structure server that provides a wide range of capabilities on which multiple platforms can be be built. Its fast and flexible data structures give your existing applications an edge in the development environment. This book is a practical guide which aims to help you deep dive into the world of Redis data structure to exploit its excellent features. We start our journey by understanding the need of Redis in brief, followed by an explanation of Advanced key management. Next, you will learn about design patterns, best practices for using Redis in DevOps environment and Docker containerization paradigm in detail. After this, you will understand the concept of scaling with Redis cluster and Redis Sentinel , followed by a through explanation of incorporating Redis with NoSQL technologies such as Elasticsearch and MongoDB. At the end of this section, you will be able to develop competent applications using these technologies. You will then explore the message queuing and task management features of Redis and will be able to implement them in your applications. Finally, you will learn how Redis can be used to build real-time data analytic dashboards, for different disparate data streams.

Who is this book for?

If you are a software developer with some experience with Redis and would now like to elevate your Redis knowledge and skills even further, then this book is for you.

What you will learn

  • Choose the right Redis data structure for your problem
  • Understand Redis event-loop and implement your own custom C commands
  • Solve complex workflows with Redis server-side scripting with Lua
  • Configure your Redis instance for optimal memory management
  • Scale your data in a distributed manner with Redis Cluster
  • Improve the stability of your Redis solution using Redis Sentinel
  • Complement your existing database and NoSQL environment with Redis
  • Exploit a wide range of features provided by Redis to become a DevOps expert.
Estimated delivery fee Deliver to Japan

Standard delivery 10 - 13 business days

$8.95

Premium delivery 3 - 6 business days

$34.95
(Includes tracking information)

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : May 31, 2016
Length: 366 pages
Edition : 1st
Language : English
ISBN-13 : 9781783988181
Category :
Data
Languages :
JavaScript
Concepts :
Database Programming
Tools :
Node.js

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
OR

Contact Details

Modal Close icon
Payment Processing...
tick Completed

Shipping Address

Billing Address

Shipping Methods
Estimated delivery fee Deliver to Japan

Standard delivery 10 - 13 business days

$8.95

Premium delivery 3 - 6 business days

$34.95
(Includes tracking information)

Product Details

Publication date : May 31, 2016
Length: 366 pages
Edition : 1st
Language : English
ISBN-13 : 9781783988181
Category :
Data
Languages :
JavaScript
Concepts :
Database Programming
Tools :
Node.js

Packt Subscriptions

See our plans and pricing
Modal Close icon
$19.99 billed monthly
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Simple pricing, no contract
START FREE TRIAL
BUY NOW
$199.99 billed annually
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just $5 each
Feature tick icon Exclusive print discounts
START FREE TRIAL
BUY NOW
$279.99 billed in 18 months
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just $5 each
Feature tick icon Exclusive print discounts
START FREE TRIAL
BUY NOW

Frequently bought together

Redis Essentials
Redis Essentials
Read more
Sep 2015 230 pages
Full star icon 4.6 (18)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $43.99
$9.99 $35.99
$43.99
Mastering Redis
Mastering Redis
Read more
May 2016 366 pages
Full star icon 3.3 (3)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $60.99
$9.99 $47.99
$60.99
Learning Redis
Learning Redis
Read more
Jun 2015 318 pages
Full star icon 2.3 (3)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $48.99
$9.99 $39.99
$48.99
Stars icon
Total $ 153.97
Redis Essentials
$43.99
Mastering Redis
$60.99
Learning Redis
$48.99
Total $ 153.97 Stars icon
Banner background image

Table of Contents

12 Chapters
1. Why Redis? Chevron down icon Chevron up icon
1. Why Redis?
Is Redis right for me?
Experimenting with Redis
Popular usage patterns
Redis isn't right because …try again soon!
Summary
2. Advanced Key Management and Data Structures Chevron down icon Chevron up icon
2. Advanced Key Management and Data Structures
Redis keys
Manually creating a Redis schema
Deconstructing a Redis object mapper
Big O notation
Reviewing the time complexity of Redis data structures
Sorted sets
Advanced sorted set operations
Bitstrings and bit operations
HyperLogLogs
Summary
3. Managing RAM – Tips and Techniques for Redis Memory Management Chevron down icon Chevron up icon
3. Managing RAM – Tips and Techniques for Redis Memory Management
Configuring Redis
32-bit Redis
Key expiration
LRU key evictions
Creating memory efficient Redis data structures
Hardware and network latencies
Operating system tips
Summary
4. Programming Redis Part One – Redis Core, Clients, and Languages Chevron down icon Chevron up icon
4. Programming Redis Part One – Redis Core, Clients, and Languages
Redis internals
Coroutines using Redis and Python
Summary
5. Programming Redis Part Two – Lua Scripting, Administration, and DevOps Chevron down icon Chevron up icon
5. Programming Redis Part Two – Lua Scripting, Administration, and DevOps
The use of Lua in Redis
Using KEYS and ARGV with Redis
Advanced Lua scripting with Redis
Programming Redis administration topics
Redis role in DevOps
Summary
6. Scaling with Redis Cluster and Sentinel Chevron down icon Chevron up icon
6. Scaling with Redis Cluster and Sentinel
Approaches to partitioning data
Clustering Redis with Twemproxy
Redis Cluster background
Overview of running Redis Cluster
Using Redis Cluster
Monitoring with Redis Sentinel
Summary
7. Redis and Complementary NoSQL Technologies Chevron down icon Chevron up icon
7. Redis and Complementary NoSQL Technologies
The proliferation of NoSQL
Redis as an analytics complement to MongoDB
Redis as a preprocessor complement to ElasticSearch
Redis as a smart cache complement to Fedora Commons
Summary
8. Docker Containers and Cloud Deployments Chevron down icon Chevron up icon
8. Docker Containers and Cloud Deployments
Linux containers
Docker basics with Redis
Layers in Docker images
Hosting and publishing Docker images
Docker and Redis issues
Packaging your application with Docker Compose
Redis and AWS
Dedicated cloud hosting options
Redis Labs
Summary
9. Task Management and Messaging Queuing Chevron down icon Chevron up icon
9. Task Management and Messaging Queuing
Overview of Redis Pub/Sub
Pub/Sub RESP replies
Redis Pub/Sub in action
Redis keyspace notifications
Task management with Redis and Celery
GIS and RestMQ
Messaging with Redis technologies
Summary
10. Measuring and Managing Information Streams Chevron down icon Chevron up icon
10. Measuring and Managing Information Streams
Extracting, transforming, and loading information with Redis
Machine learning and Redis
Summary
A. Sources Chevron down icon Chevron up icon
Chapter 1: Why Redis?
Chapter 2: Advanced Key Management and Data Structures
Chapter 3: Managing RAM – Tips and Techniques for Redis Memory Management
Chapter 6: Scaling with Redis Cluster and Sentinel
Chapter 7: Redis and Complementary NoSQL Technologies
Chapter 10: Measuring and Managing Information Streams
Index Chevron down icon Chevron up icon
Index

Recommendations for you

Left arrow icon
Python Machine Learning By Example
Python Machine Learning By Example
Read more
Jul 2024 518 pages
Full star icon 4.9 (8)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $45.99
$9.99 $36.99
$45.99
Unlocking Data with Generative AI and RAG
Unlocking Data with Generative AI and RAG
Read more
Sep 2024 346 pages
Full star icon 5 (1)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $39.99
$9.99 $31.99
$39.99
Building LLM Powered Applications
Building LLM Powered Applications
Read more
May 2024 342 pages
Full star icon 4.2 (22)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $49.99
$9.99 $39.99
$49.99
Python for Algorithmic Trading Cookbook
Python for Algorithmic Trading Cookbook
Read more
Aug 2024 404 pages
Full star icon 4.6 (15)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $59.99
$9.99 $47.99
$59.99
Machine Learning with PyTorch and Scikit-Learn
Machine Learning with PyTorch and Scikit-Learn
Read more
Feb 2022 774 pages
Full star icon 4.4 (95)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $54.99
$9.99 $43.99
$54.99
Artificial Intelligence Engines
Artificial Intelligence Engines
Read more
Nov 2024 217 pages
eBook
eBook
  • eBook eBook $6.98
$6.98 $9.99
AI Product Manager's Handbook
AI Product Manager's Handbook
Read more
Nov 2024 484 pages
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $49.99
$9.99 $39.99
$49.99
RAG-Driven Generative AI
RAG-Driven Generative AI
Read more
Sep 2024 334 pages
Full star icon 4.5 (13)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $43.99
$9.99 $35.99
$43.99
Hands-On Reinforcement Learning with Python
Hands-On Reinforcement Learning with Python
Read more
Jun 2018 318 pages
Full star icon 2.6 (18)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $38.99
$9.99 $29.99
$38.99
LLM Engineer's Handbook
LLM Engineer's Handbook
Read more
Oct 2024 522 pages
Full star icon 4.8 (17)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $59.99
$9.99 $47.99
$59.99
Right arrow icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.3
(3 Ratings)
5 star 33.3%
4 star 0%
3 star 33.3%
2 star 33.3%
1 star 0%
Deo nguyen Jul 10, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Good
Amazon Verified review Amazon
stefano Feb 16, 2017
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Good content but horrible editing. Let me quickly grom the state of redis clustering options.
Amazon Verified review Amazon
JB Feb 08, 2019
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
Feb/2019. Picked this up (ebook from packt site) as it was the newest publication listed at the Redis site. So far, I'm on chapter 3 and have found numerous errata and confusing examples. The book clearly contains some useful information, but I keep finding myself thinking "wait, that can't be right". I've found errors in the coding examples and errors in the text that seem to go beyond simple typo and make me question the author's expertise on the subject matter.Example1: In chapter 3, on memory management, the author is discussing the "rdbchecksumdirective" and indicates that this enables a CRC64 checksum to be added to the end of a RDB snapshot. The author writes: "Performing an RDB snapshot with this CRC64 checksum imposes a 10% increase in memory usage when Redis spawns a child process that saves the snapshot in the disk." ... wait, that can't be right ... why would memory usage increase by 10% when computing a checksum??? OK, so I looked this up in the redis config file. First, I did a google search for "rdbchecksumdirective" and only found hits related to the book. Why? Because it's actually "rdbchecksum" (ok, simple typo there). The actual redis.conf file indicates "there is a performance hit to pay (around 10%) when saving and loading RDB files, so you can disable it for maximum performances" - this makes total sense. There is a CPU performance penalty for computing a checksum - not an increase in memory usage as indicated by the book.Example2: In chapter 2, there is a discussion of the HyperLogLog type. [This is like a "set", but it doesn't actually store the members of the set, but is able to estimate the number of members (cardinality) without actually storing the members.] The author compares the cardinality results between using an actual Set and using a HyperLogLog. For a regular set, he adds elements 1..52111. Then gets cardinality showing 52411 (typo?) but then he compares this incorrect number to the estimated cardinality from the HyperLogLog of 52213. At this point, I don't know if the resulting math makes any sense at all being based on incorrect numbers.Example3: In a (simple?) diagram of a bitmap, he shows 8 bits in a byte, but then shows the Redis commands only using 1 (leftmost) bit per byte. Setting bit "1" (0-based) is shown to set the 1st bit in the 2nd byte. Bit "2" is shown to be the 1st bit in the 3rd byte. ... wait, this can't be right??? In the text, this is continued with and example setting bit 2445 where the author refers to it as the "2445 byte".So, I'd say this is a good book to get you going, but be prepared to fact check what you are reading.EDIT: Now reading Chapter 4 and need to lower to 2 stars. Continuing to find errors/issues.Chapter 4 starts diving into some of the C source code for Redis. In one paragraph, the author sees fit to draw our attention to 3 #defines which are internal states of the "AOF" mechanism - yet nowhere in the entire book does the author talk about AOF. I have no idea why the author would tell us that "REDIS_AOF_WAIT_REWRITE" is defined as 2. Basically: "See... there are these #defines... and this one is defined as 2!" ?And in the next paragraph... "redis.h defines nineteen different flags to set a bit to 1 using the << bitwise left-shift operator so that a client information can be represented in a single byte." 1) Why are we talking about some internally defined constants? 2) Why is the author explaining a bitwise left-shift operator? 3) How has the author managed to fit 19 flags into a byte?
Amazon Verified review Amazon

People who bought this also bought

Left arrow icon
Machine Learning Engineering with Python
Machine Learning Engineering with Python
Read more
Aug 2023 462 pages
Full star icon 4.6 (36)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $49.99
$9.99 $39.99
$49.99
Deep Learning with TensorFlow and Keras – 3rd edition
Deep Learning with TensorFlow and Keras – 3rd edition
Read more
Oct 2022 698 pages
Full star icon 4.6 (45)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $49.99
$9.99 $39.99
$49.99
Modern Generative AI with ChatGPT and OpenAI Models
Modern Generative AI with ChatGPT and OpenAI Models
Read more
May 2023 286 pages
Full star icon 4.2 (34)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $49.99
$9.99 $39.99
$49.99
Generative AI with LangChain
Generative AI with LangChain
Read more
Dec 2023 368 pages
Full star icon 4 (34)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $49.99
$9.99 $39.99
$49.99
Causal Inference and Discovery in Python
Causal Inference and Discovery in Python
Read more
May 2023 456 pages
Full star icon 4.5 (49)
eBook
eBook
  • eBook eBook $9.99
  • Paperback Paperback $39.99
$9.99 $31.99
$39.99
Right arrow icon

About the authors

Left arrow icon
Profile icon Nelson
Nelson
Jeremy Nelson is the metadata and systems librarian at Colorado College, a 4-year private liberal arts college in Colorado Springs. In addition to working 8 hours a week on the library's research helpdesk, providing information literacy instructions to undergraduates, and supervising the library's systems and cataloguing departments, Nelson is actively researching and developing various components and open source tools in the Catalog Pull Platform for use by Colorado College, the Colorado Alliance of Research Libraries Consortium, and the Library of Congress. He is also co-founder and CTO of KnowledgeLinks.io, a semantic web startup. His previous library experience includes jobs at Western State Colorado University and the University of Utah. Prior to becoming a librarian, he worked as programmer and project manager at various software companies and financial services institutions. His first book, Becoming a Lean Library, published in 2015, applies lean startup and lean manufacturing ideas to libraries and library operations. Nelson's undergraduate degree is from Knox College and his master's of science in library and information science is from the University of Illinois Urbana-Champaign.
Read more
See other products by Nelson
Profile icon Vidyasagar N V
Vidyasagar N V
Read more
See other products by Vidyasagar N V
Right arrow icon
Get free access to Packt library with over 7500+ books and video courses for 7 days!
Start Free Trial

FAQs

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela