1.
CouchDB & PouchDB
Julio Castro
@jec_ar
www.xgem.com.ar

2.
What was I looking for?
- Mobile
- Distribution
- Offline
- Synchronization
- Easy Library
- Compatibility
- Non structure model

3.
What did I find?
• JavaScript libraries
• No-SQL
• Document database
• Multiple database nodes
• REST API

4.
CouchDB
• Replication is the number one feature.
• …replication to solve a number of problems.
• redundant data storage
• load balancing

5.
Fallacies of Distributed Computing:

6.
CouchDB
• Eventual Consistency
…Unlike traditional relational
databases, where each action
performed is necessarily subject to
database-wide consistency checks,
CouchDB makes it really simple to
build applications that sacrifice
immediate consistency for the
huge performance improvements
that come with simple distribution.
• Local Consistency ¿? next slide
[Wiki] Paxos

7.
CouchDB
• powerful B-tree storage engine
• uses MapReduce to compute the results of a view
• No locks, uses Multi-Version Concurrency Control (MVCC)
[Wiki] B-Tree
[Wiki] MVCC

8.
CouchDB
• Validations
• provides a powerful way to perform per-document validation from
within the database. Using JavaScript.

9.
CouchDB
• Distributed Consistency
• Incremental replication
• CouchDB’s replication
system comes with
automatic conflict
detection and resolution

10.
CouchDB
• API REST
• curl http://127.0.0.1:5984/
• {"couchdb":"Welcome","version":"0.10.1"}
• curl -X GET http://127.0.0.1:5984/_all_dbs
• []
• curl -X PUT http://127.0.0.1:5984/xgem
• {"ok":true}

11.
CouchDB
• Futon

12.
CouchDB
• Design Docs
• special type of CouchDB
document that contains
application code.
• Views
• Validations
• Show

13.
• an in-browser database
• also runs in Node.js
• a direct interface
to CouchDB-compatible
servers
• PouchDB is not a self-
contained database
• it is a CouchDB-style
abstraction layer

14.
• Plugins
• PouchDB Authentication
• Pouch Box
• Allows decentralized authentication and access control per document, using
asymmetric encryption.
• Pouch Mirror
• Creates a synced in-memory mirror of a remote CouchDB for faster reads.
• And more…

15.
Architecture
Online

16.
Architecture
Offline

17.
Herkimer @xgem
• Mobile
• Client iOS/Android
• Geo-localization: What? When? routes
management.
• Picture: Capture & Sync
• Scan QR/Barcode
• Document transformation (excel, pdf)
• Communication
• Push Notifications (single/broadcast)
• Integration Hub
• MQTT
• NIFI
• IoT
• Security
• SSL,oAuth2
• Social Login
• Share on Social networks or email
• Fingerprint
• Data:
• Data model by configuration
• Document DB
• Sensitive data collections
• Client consume configuration from Backend
• Auto Sync per collection
• Backend “multiple” project
• Reporting
• RESP API / export data
• Reduced data collection for mobile
performance.
STATUS: Under development. xGem Member access only.

18.
Herkimer @xgem
RDBMS & No-SQL No-SQL

19.
Thanks…
Julio Castro
@jec_ar
http://www.xgem.com.ar