Couchdb Nosql
10 likes794 views
- Apache CouchDB is a scalable key-value store that uses peer-based replication for data synchronization. It uses an append-only file structure and is designed to be crash resilient. - CouchDB stores data as JSON documents and uses JavaScript based map-reduce functions to index and query the documents. The API is RESTful and uses HTTP. - CouchDB is optimized for web applications by allowing data access with low latency and enabling fully replicated applications that can scale from a single machine to a cluster of servers.
![JSON Documents
{
"_id": "BCCD12CBB", Schema Free
"_rev": "1-AB764C",
"type": "person",
"name": "Darth Vader",
Self-Contained
"age": 63,
"headware":
["Helmet", "Sombrero"], JavaScript Map
}
"dark_side": true
Reduce Views](https://image.slidesharecdn.com/couchdbnosql-090712090011-phpapp01/85/Couchdb-Nosql-14-320.jpg)
Ad
More Related Content
What's hot (19)
Viewers also liked (16)
Ad
Similar to Couchdb Nosql (20)
Ad
More from elliando dias (20)
Recently uploaded (20)
Couchdb Nosql
- 2. Relax
- 3. Hello • J Chris Anderson • Apache CouchDB committer • Web programmer (Rails, Ajax, etc) • Director, couch.io
- 4. About You? • Web developers are easy • Scalable key/value store • Peer-based Replication • Append-only IO pattern
- 5. Scaling Up • Hot. Literally. • You don’t have to think.
- 6. X Scaling Up • Hot. Literally. • You don’t have to think.
- 7. Scale Enforces Constraints • Distributed key / value stores • Context is expensive • No joins or autoincrement • Eventual consistency
- 9. Why CouchDB? Native to the Web Local data == low latency Replicated applications Scale from a cluster to a smartphone
- 10. Of the Web Let me tell you something: Django may be built for the Web, but CouchDB is built of the Web. I've never seen software that so completely embraces the philosophies behind HTTP. ... this is what the software of the future looks like. Jacob Kaplan-Moss October 19, 2007 http://jacobian.org/writing/of-the-web/
- 12. Robust Storage Append Only File Structure Designed to Crash Instant-On
- 14. JSON Documents { "_id": "BCCD12CBB", Schema Free "_rev": "1-AB764C", "type": "person", "name": "Darth Vader", Self-Contained "age": 63, "headware": ["Helmet", "Sombrero"], JavaScript Map } "dark_side": true Reduce Views
- 15. Map Reduce Views Docs { “user” : “Chris”, Map { “key” : “Alice”, “value” : 5 } “points” : 3 } { “key” : “Bob”, “value” : 7 } { “user” : “Joe”, function(doc) { { “key” : “Chris”, “value” : 3 } “points” : 10 } if (doc.user && doc.points) { { “key” : “Joe”, “value” : 10 } { “user” : “Alice”, emit(doc.user, doc.points); { “key” : “Mary”, “value” : 9 } “points” : 5 } } { “user” : “Mary”, } “points” : 9 } { “user” : “Bob”, Reduce “points” : 7 } Alice ... Chris: 15 function(keys, values, rereduce) { Everyone: 34 return sum(values); }
- 18. ful You already know the API Use existing HTTP tools Talk directly to the browser
- 19. ful CRUD • Create HTTP PUT /db/mydocid • Read HTTP GET /db/mydocid • Update HTTP PUT /db/mydocid • Delete HTTP DELETE /db/mydocid
- 20. Clustering w/ CouchDB-Lounge Partitioning / clustering proxy Nginx module Twisted Python query merge Makes many machines into one Couch
- 21. Local Data Low latency (fast) Peer-based incremental replication View source --> Open source
- 22. Gives Control to Users CC-BY-SA http://www.flickr.com/photos/kelleys/492253912/
- 30. “no bars”
- 34. Latency Sucks
- 35. Scaling Down 4 MB RAM
- 37. Browser Couch JavaScript port Uses HTML5 storage Replicates with CouchDB http://hg.toolness.com/browser-couch/
- 38. No SQL in HTML5
- 54. Document Oriented Not Relational • Documents in the Real World™ • Bills, letters, tax forms… • Same type != same structure • Self contained • Can be out of date (so what?) • No references
- 55. Document Oriented Not Relational • Documents in the Real World™ Bills, letters, tax forms… Natural Data • • Same type != same structure • Behaviour Can be out of date (so what?) • No references
- 59. Render JSON Docs as HTML shows/post.js /drl/_design/sofa/_show/post/Hello-World-For-Real-This-Time
- 61. Render Views as HTML lists/index.js /drl/_list/sofa/index/recent-posts?descending=true&limit=8
- 70. anks!
- 71. Resources @CouchDB http://couchdb.apache.org/ Dress like a Couch: http://shop.couchdb.com http://planet.couchdb.org/ https://peepcode.com/products/couchdb-with-rails
- 73. couch.io Berlin – London – Portland