Scaling down CouchDB - Meet TouchDB

Nov 20, 2012Download as PPTX, PDF1 like1,552 views

TouchDB is a lightweight database engine compatible with CouchDB that is designed for mobile applications. It uses SQLite for local storage and replicates with CouchDB. The document discusses using TouchDB to prototype a personal wellness application, noting its advantages like offline functionality, replication, and meeting performance needs for small datasets on mobile. Some cons are that the iOS and Android ports are still immature, security is fragile through the HTTP API, and there is a small development community compared to CouchDB.

TouchDB –
scaling down CouchDB
Stefan Baggström
20th Nov 2012

Background

• We are a research team ”Felix” in TUT/BME
developing new ICT solutions in the area of
health and wellness technology
• We have built a system prototype with
CouchDB technologies
– to iterate the product concept rapidly
– to pilot with potential customers

2

Prototyping a wellness
application with CouchDB
• Goals for prototype:
– Can be used with any Internet devices
– Good offline functionality
• Being agile:
– Data model evolves across increments
• There is a schedule to meet:
– Consider tech learning curves and
development time

3

System to be built

Customer

Wellness
Professional
4

CouchDB http://couchdb.apache.org/

• CouchDB has some interesting features
– JSON document storage
– Distributed architecture
– Eventual consistency
– Bi-directional replication
– Serving applications directly from database
• Scaling up - see e.g. BigCouch

5

CouchDB – scaling down

• There is CouchDB port for iOS and Android
(Couchbase Mobile), but the project is dead
– Erlang implementation as in CouchDB
– Issues: size (~4MB) and slow startup (5-10s)

Source: http://www.funny-potato.com/

6

Meet TouchDB
• TouchDB is a lightweight
CouchDB-compatible
database engine with
similar REST API to
CouchDB
• Replicates with CouchDB
• iOS and Android ports
implemented with
Objective-C / Java on top
of SQLite
• Native language access
via CouchCocoa / Ektorp

https://github.com/couchbaselabs/TouchDB-iOS/wiki 7

Personal Wellness App –
What is needed and what not?
• Good enough performance for
– Relatively small data sets (may have large
attachments)
– A few relatively simple data queries
– Good functionality when offline or with
intermittent connectivity
• Support for multi-device-ownership
– Use with any device that suits your task and
context
20.11.2012 8

Wellness Android app –
Abstract architecture

Application UI – HTML5 with JQuery Mobile

WebView with Java-JavaScript IF TouchDB – http listener

TouchDB -
Application Core TouchDB library
Ektorp

Android – Android –
Android – Java VM Android - SQLite
MM APIs BT API

9

How do we use TouchDB? (1/2)

• All documents defined with ”type” property
– Database schema emerging
• Using Java Ektorp API for document CRUD
• Using HTTP API for application resources
and views
– Implemented home brewn access control
• Database provides changes feed
– Used to trigger notifications and other actions
11

How do we use TouchDB? (2/2)

• Single responsive HTML5 application for
desktops, tablets, and smart phones
– CouchApp used for deployment to CouchDB
• Initial replication in foreground during first
time use, and then continuous replication in
background
• Data model evolves all the time

12

TouchDB for wellness app
Pros Cons
• Offline functionality • Immature at the moment
– All transactions are always – iOS port just got v1.0 status,
fast & predictable as they Android port is behind iOS
are local transactions
– Small development community
• Replication
• Fragile security
– Data
– HTTP API is accessible by
– Applications other Android applications
– Supports filtered replication within device - better control if
• NoSQL is supports used only via Java/Ektorp
incremental development • Lack of C/TouchDB
• Meets performance professionals out there
requirements of a personal
database
• JavaScript in server and
clients
13

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𝙄𝙨 𝘼𝙄 𝙟𝙪𝙨𝙩 𝙝𝙮𝙥𝙚? 𝙊𝙧 𝙞𝙨 𝙞𝙩 𝙩𝙝𝙚 𝙜𝙖𝙢𝙚 𝙘𝙝𝙖𝙣𝙜𝙚𝙧 𝙮𝙤𝙪𝙧 𝙗𝙪𝙨𝙞𝙣𝙚𝙨𝙨 𝙣𝙚𝙚𝙙𝙨? Everyone’s talking about AI but is anyone really using it to create real value? Most companies want to leverage AI. Few know 𝗵𝗼𝘄. ✅ What exactly should you ask to find real AI opportunities? ✅ Which AI techniques actually fit your business? ✅ Is your data even ready for AI? If you’re not sure, you’re not alone. This is a condensed version of the slides I presented at a Linkedin webinar for Tecnovy on 28.04.2025.

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Book industry standards are evolving rapidly. In the first part of this session, we’ll share an overview of key developments from 2024 and the early months of 2025. Then, BookNet’s resident standards expert, Tom Richardson, and CEO, Lauren Stewart, have a forward-looking conversation about what’s next. Link to recording, presentation slides, and accompanying resource: https://bnctechforum.ca/sessions/standardsgoals-for-2025-standards-certification-roundup/ Presented by BookNet Canada on May 6, 2025 with support from the Department of Canadian Heritage.

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Want to learn practical tips for designing systems that can scale efficiently without compromising speed? Join us for a workshop where we’ll address these challenges head-on and explore how to architect low-latency systems using Rust. During this free interactive workshop oriented for developers, engineers, and architects, we’ll cover how Rust’s unique language features and the Tokio async runtime enable high-performance application development. As you explore key principles of designing low-latency systems with Rust, you will learn how to: - Create and compile a real-world app with Rust - Connect the application to ScyllaDB (NoSQL data store) - Negotiate tradeoffs related to data modeling and querying - Manage and monitor the database for consistently low latencies

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This is a Quick Research Guide (QRG). QRGs include the following: - A brief, high-level overview of the QRG topic. - A milestone timeline for the QRG topic. - Links to various free online resource materials to provide a deeper dive into the QRG topic. - Conclusion and a recommendation for at least two books available in the SJPL system on the QRG topic. QRGs planned for the series: - Artificial Intelligence QRG - Quantum Computing QRG - Big Data Analytics QRG - Spacecraft Guidance, Navigation & Control QRG (coming 2026) - UK Home Computing & The Birth of ARM QRG (coming 2027) Any questions or comments? - Please contact Arthur Morgan at [email protected]. 100% human made.

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AI Changes Everything – Talk at Cardiff Metropolitan University, 29th April 2...Alan Dix

Talk at the final event of Data Fusion Dynamics: A Collaborative UK-Saudi Initiative in Cybersecurity and Artificial Intelligence funded by the British Council UK-Saudi Challenge Fund 2024, Cardiff Metropolitan University, 29th April 2025 https://alandix.com/academic/talks/CMet2025-AI-Changes-Everything/ Is AI just another technology, or does it fundamentally change the way we live and think? Every technology has a direct impact with micro-ethical consequences, some good, some bad. However more profound are the ways in which some technologies reshape the very fabric of society with macro-ethical impacts. The invention of the stirrup revolutionised mounted combat, but as a side effect gave rise to the feudal system, which still shapes politics today. The internal combustion engine offers personal freedom and creates pollution, but has also transformed the nature of urban planning and international trade. When we look at AI the micro-ethical issues, such as bias, are most obvious, but the macro-ethical challenges may be greater. At a micro-ethical level AI has the potential to deepen social, ethnic and gender bias, issues I have warned about since the early 1990s! It is also being used increasingly on the battlefield. However, it also offers amazing opportunities in health and educations, as the recent Nobel prizes for the developers of AlphaFold illustrate. More radically, the need to encode ethics acts as a mirror to surface essential ethical problems and conflicts. At the macro-ethical level, by the early 2000s digital technology had already begun to undermine sovereignty (e.g. gambling), market economics (through network effects and emergent monopolies), and the very meaning of money. Modern AI is the child of big data, big computation and ultimately big business, intensifying the inherent tendency of digital technology to concentrate power. AI is already unravelling the fundamentals of the social, political and economic world around us, but this is a world that needs radical reimagining to overcome the global environmental and human challenges that confront us. Our challenge is whether to let the threads fall as they may, or to use them to weave a better future.

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