CouchDB

CouchDB Session, Barcamp 'The Next Web', Salzburg 2011

1. Introduction Documents Distributed System Queries and Views CouchApps CouchDB Kerstin Puschke The Next Web - Barcamp Salzburg 2011 Kerstin Puschke NoSQL
2. Introduction Documents Distributed System Queries and Views CouchApps License License Creative Commons Attribution 3.0 Germany Lizenz, see http://creativecommons.org/licenses/by/3.0/de/ Kerstin Puschke NoSQL
3. Introduction Documents Distributed System Queries and Views CouchApps Outline 1 Introduction Kerstin Puschke NoSQL
4. Introduction Documents Distributed System Queries and Views CouchApps Outline 1 Introduction 2 Documents Document-Oriented Data Model Updates and Concurrency Design Documents Kerstin Puschke NoSQL
5. Introduction Documents Distributed System Queries and Views CouchApps Outline 1 Introduction 2 Documents Document-Oriented Data Model Updates and Concurrency Design Documents 3 Distributed System Kerstin Puschke NoSQL
6. Introduction Documents Distributed System Queries and Views CouchApps Outline 1 Introduction 2 Documents Document-Oriented Data Model Updates and Concurrency Design Documents 3 Distributed System 4 Queries and Views Views Creating Views with Map Reduce Example Kerstin Puschke NoSQL
7. Introduction Documents Distributed System Queries and Views CouchApps Outline 1 Introduction 2 Documents Document-Oriented Data Model Updates and Concurrency Design Documents 3 Distributed System 4 Queries and Views Views Creating Views with Map Reduce Example 5 CouchApps Kerstin Puschke NoSQL
8. Introduction Documents Distributed System Queries and Views CouchApps CouchDB? Cluster Of Unreliable Commodity Hardware DataBase Kerstin Puschke NoSQL
9. Introduction Documents Distributed System Queries and Views CouchApps CouchDB? Cluster Of Unreliable Commodity Hardware DataBase NoSQL database, non-relational data store Kerstin Puschke NoSQL
10. Introduction Documents Distributed System Queries and Views CouchApps CouchDB? Cluster Of Unreliable Commodity Hardware DataBase NoSQL database, non-relational data store schemaless Kerstin Puschke NoSQL
11. Introduction Documents Distributed System Queries and Views CouchApps CouchDB? Cluster Of Unreliable Commodity Hardware DataBase NoSQL database, non-relational data store schemaless distributed computing - robust replication Kerstin Puschke NoSQL
12. Introduction Documents Distributed System Queries and Views CouchApps CouchDB? Cluster Of Unreliable Commodity Hardware DataBase NoSQL database, non-relational data store schemaless distributed computing - robust replication scaling up and down Kerstin Puschke NoSQL
13. Introduction Documents Distributed System Queries and Views CouchApps CouchDB? Cluster Of Unreliable Commodity Hardware DataBase NoSQL database, non-relational data store schemaless distributed computing - robust replication scaling up and down open web standards Kerstin Puschke NoSQL
14. Introduction Documents Distributed System Queries and Views CouchApps CouchDB? Cluster Of Unreliable Commodity Hardware DataBase NoSQL database, non-relational data store schemaless distributed computing - robust replication scaling up and down open web standards decentralized (web)applications - available offline Kerstin Puschke NoSQL
15. Introduction Documents Distributed System Queries and Views CouchApps In the Wild BBC Kerstin Puschke NoSQL
16. Introduction Documents Distributed System Queries and Views CouchApps In the Wild BBC Ubuntu One Kerstin Puschke NoSQL
17. Introduction Documents Distributed System Queries and Views CouchApps In the Wild BBC Ubuntu One lots of software, websites, facebook apps, . . . Kerstin Puschke NoSQL
18. Introduction Documents Distributed System Queries and Views CouchApps Getting Started RESTful HTTP/JSON API Kerstin Puschke NoSQL
19. Introduction Documents Distributed System Queries and Views CouchApps Getting Started RESTful HTTP/JSON API Webserver included Kerstin Puschke NoSQL
20. Introduction Documents Distributed System Queries and Views CouchApps Getting Started RESTful HTTP/JSON API Webserver included http://localhost:5984 http://localhost:5984/_all_dbs Kerstin Puschke NoSQL
21. Introduction Documents Distributed System Queries and Views CouchApps Getting Started RESTful HTTP/JSON API Webserver included http://localhost:5984 http://localhost:5984/_all_dbs create a database PUT http://localhost:5984/foo Kerstin Puschke NoSQL
22. Introduction Documents Distributed System Queries and Views CouchApps Getting Started RESTful HTTP/JSON API Webserver included http://localhost:5984 http://localhost:5984/_all_dbs create a database PUT http://localhost:5984/foo delete a a database DELETE http://localhost:5984/foo Kerstin Puschke NoSQL
23. Introduction Documents Distributed System Queries and Views CouchApps Getting Started RESTful HTTP/JSON API Webserver included http://localhost:5984 http://localhost:5984/_all_dbs create a database PUT http://localhost:5984/foo delete a a database DELETE http://localhost:5984/foo Webinterface Futon http://localhost:5984/_utils Kerstin Puschke NoSQL
24. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Document-Oriented Data Model abstraction layer above key-value pairs Kerstin Puschke NoSQL
25. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Document-Oriented Data Model abstraction layer above key-value pairs document: self-contained data, reasonable unit of information (invoice, business card,. . . ) Kerstin Puschke NoSQL
26. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Document-Oriented Data Model abstraction layer above key-value pairs document: self-contained data, reasonable unit of information (invoice, business card,. . . ) schemaless, no referential integrity flexible, but dangerous Kerstin Puschke NoSQL
27. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Document-Oriented Data Model abstraction layer above key-value pairs document: self-contained data, reasonable unit of information (invoice, business card,. . . ) schemaless, no referential integrity flexible, but dangerous JSON-object values can be scalar, array, objects, nested data structures,. . . Kerstin Puschke NoSQL
28. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Document-Oriented Data Model abstraction layer above key-value pairs document: self-contained data, reasonable unit of information (invoice, business card,. . . ) schemaless, no referential integrity flexible, but dangerous JSON-object values can be scalar, array, objects, nested data structures,. . . mandatory fields: Kerstin Puschke NoSQL
29. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Document-Oriented Data Model abstraction layer above key-value pairs document: self-contained data, reasonable unit of information (invoice, business card,. . . ) schemaless, no referential integrity flexible, but dangerous JSON-object values can be scalar, array, objects, nested data structures,. . . mandatory fields: unique document identifier _id (UUID) Kerstin Puschke NoSQL
30. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Document-Oriented Data Model abstraction layer above key-value pairs document: self-contained data, reasonable unit of information (invoice, business card,. . . ) schemaless, no referential integrity flexible, but dangerous JSON-object values can be scalar, array, objects, nested data structures,. . . mandatory fields: unique document identifier _id (UUID) revision identifier _rev Kerstin Puschke NoSQL
31. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Document-Oriented Data Model abstraction layer above key-value pairs document: self-contained data, reasonable unit of information (invoice, business card,. . . ) schemaless, no referential integrity flexible, but dangerous JSON-object values can be scalar, array, objects, nested data structures,. . . mandatory fields: unique document identifier _id (UUID) revision identifier _rev files can be attached to documents Kerstin Puschke NoSQL
32. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents CouchDB Document JSON Kerstin Puschke NoSQL
33. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Updates client sends full document Kerstin Puschke NoSQL
34. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Updates client sends full document append-only - new version appended to database no diffs, no partial updates Kerstin Puschke NoSQL
35. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Updates client sends full document append-only - new version appended to database no diffs, no partial updates robust and fast Kerstin Puschke NoSQL
36. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Multi Version Concurrency Control optimistic locking Kerstin Puschke NoSQL
37. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Multi Version Concurrency Control optimistic locking client sends new version of document along with old _rev Kerstin Puschke NoSQL
38. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Multi Version Concurrency Control optimistic locking client sends new version of document along with old _rev server checks if _rev matches the one stored in the database Kerstin Puschke NoSQL
39. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Multi Version Concurrency Control optimistic locking client sends new version of document along with old _rev server checks if _rev matches the one stored in the database yes: new version saved along with new _rev Kerstin Puschke NoSQL
40. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Multi Version Concurrency Control optimistic locking client sends new version of document along with old _rev server checks if _rev matches the one stored in the database yes: new version saved along with new _rev no: conflict - update refused with 409 Kerstin Puschke NoSQL
41. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Multi Version Concurrency Control optimistic locking client sends new version of document along with old _rev server checks if _rev matches the one stored in the database yes: new version saved along with new _rev no: conflict - update refused with 409 no version control some versions unavailable (at least on some nodes) Kerstin Puschke NoSQL
42. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Design Documents _id starts with _design Kerstin Puschke NoSQL
43. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Design Documents _id starts with _design create, update, replicate,. . . like any other document Kerstin Puschke NoSQL
44. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Design Documents _id starts with _design create, update, replicate,. . . like any other document no data but code Kerstin Puschke NoSQL
45. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Design Documents _id starts with _design create, update, replicate,. . . like any other document no data but code validate_doc_update: validation of updates Kerstin Puschke NoSQL
46. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Design Documents _id starts with _design create, update, replicate,. . . like any other document no data but code validate_doc_update: validation of updates update: server-side logic for document creation or update Kerstin Puschke NoSQL
47. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Design Documents _id starts with _design create, update, replicate,. . . like any other document no data but code validate_doc_update: validation of updates update: server-side logic for document creation or update show, list: rendering output Kerstin Puschke NoSQL
48. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Design Documents _id starts with _design create, update, replicate,. . . like any other document no data but code validate_doc_update: validation of updates update: server-side logic for document creation or update show, list: rendering output map, reduce: creation of views/indices Kerstin Puschke NoSQL
49. Introduction Documents Distributed System Queries and Views CouchApps Document-Oriented Data Model Updates and Concurrency Design Documents Design Documents _id starts with _design create, update, replicate,. . . like any other document no data but code validate_doc_update: validation of updates update: server-side logic for document creation or update show, list: rendering output map, reduce: creation of views/indices default language: JavaScript plugins for PHP, Ruby, Python, Perl, Common Lisp, Erlang,. . . Kerstin Puschke NoSQL
50. Introduction Documents Distributed System Queries and Views CouchApps Replication shared nothing cluster Kerstin Puschke NoSQL
51. Introduction Documents Distributed System Queries and Views CouchApps Replication shared nothing cluster incremental Kerstin Puschke NoSQL
52. Introduction Documents Distributed System Queries and Views CouchApps Replication shared nothing cluster incremental latest revision only - no transfer of previous versions Kerstin Puschke NoSQL
53. Introduction Documents Distributed System Queries and Views CouchApps Replication shared nothing cluster incremental latest revision only - no transfer of previous versions N-Master, Master-Slave,. . . Kerstin Puschke NoSQL
54. Introduction Documents Distributed System Queries and Views CouchApps Replication shared nothing cluster incremental latest revision only - no transfer of previous versions N-Master, Master-Slave,. . . very robust Kerstin Puschke NoSQL
55. Introduction Documents Distributed System Queries and Views CouchApps Replication shared nothing cluster incremental latest revision only - no transfer of previous versions N-Master, Master-Slave,. . . very robust filtered Kerstin Puschke NoSQL
56. Introduction Documents Distributed System Queries and Views CouchApps Replication shared nothing cluster incremental latest revision only - no transfer of previous versions N-Master, Master-Slave,. . . very robust filtered ’non-destructive’ conflict handling Kerstin Puschke NoSQL
57. Introduction Documents Distributed System Queries and Views CouchApps Eventual Consistency Consistency, Availability, Partition Tolerance Consistency, Availability, Partition Tolerance - you can’t have it all. . . Kerstin Puschke NoSQL
58. Introduction Documents Distributed System Queries and Views CouchApps Eventual Consistency Consistency, Availability, Partition Tolerance Consistency, Availability, Partition Tolerance - you can’t have it all. . . CouchDB provides eventual consistency Kerstin Puschke NoSQL
59. Introduction Documents Distributed System Queries and Views CouchApps Eventual Consistency Consistency, Availability, Partition Tolerance Consistency, Availability, Partition Tolerance - you can’t have it all. . . CouchDB provides eventual consistency inconsistency window Kerstin Puschke NoSQL
60. Introduction Documents Distributed System Queries and Views CouchApps Eventual Consistency Consistency, Availability, Partition Tolerance Consistency, Availability, Partition Tolerance - you can’t have it all. . . CouchDB provides eventual consistency inconsistency window BASE - basically available, soft-state, eventually consistent Kerstin Puschke NoSQL
61. Introduction Documents Distributed System Queries and Views CouchApps Eventual Consistency Consistency, Availability, Partition Tolerance Consistency, Availability, Partition Tolerance - you can’t have it all. . . CouchDB provides eventual consistency inconsistency window BASE - basically available, soft-state, eventually consistent ACID on a single node, BASE in a distributed system Kerstin Puschke NoSQL
62. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Queries fetch document by _id Kerstin Puschke NoSQL
63. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Queries fetch document by _id no dynamic queries, no ad hoc reporting Kerstin Puschke NoSQL
64. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Queries fetch document by _id no dynamic queries, no ad hoc reporting need to create views (indices) to query Kerstin Puschke NoSQL
65. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Views (secondary) index key-value-pairs Kerstin Puschke NoSQL
66. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Views (secondary) index key-value-pairs keys and values are values from documents Kerstin Puschke NoSQL
67. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Views (secondary) index key-value-pairs keys and values are values from documents Example: creation date as key, title of post as value Kerstin Puschke NoSQL
68. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Views (secondary) index key-value-pairs keys and values are values from documents Example: creation date as key, title of post as value composite keys and values possible Kerstin Puschke NoSQL
69. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Views (secondary) index key-value-pairs keys and values are values from documents Example: creation date as key, title of post as value composite keys and values possible sorted by key Kerstin Puschke NoSQL
70. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Views (secondary) index key-value-pairs keys and values are values from documents Example: creation date as key, title of post as value composite keys and values possible sorted by key efficient lookup of keys or key ranges ’Posts created in May 2009’ Kerstin Puschke NoSQL
71. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Views (secondary) index key-value-pairs keys and values are values from documents Example: creation date as key, title of post as value composite keys and values possible sorted by key efficient lookup of keys or key ranges ’Posts created in May 2009’ values can be aggregated Kerstin Puschke NoSQL
72. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Views (secondary) index key-value-pairs keys and values are values from documents Example: creation date as key, title of post as value composite keys and values possible sorted by key efficient lookup of keys or key ranges ’Posts created in May 2009’ values can be aggregated created and updated when accessed Kerstin Puschke NoSQL
73. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example View Example View with key date and value title, in Futon Kerstin Puschke NoSQL
74. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Map Reduce map and reduce functions common in functional programming Kerstin Puschke NoSQL
75. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Map Reduce map and reduce functions common in functional programming MapReduce: framework for concurrent, distributed processing of large data sets (Google) Kerstin Puschke NoSQL
76. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Map Reduce map and reduce functions common in functional programming MapReduce: framework for concurrent, distributed processing of large data sets (Google) map and reduce defined in design documents Kerstin Puschke NoSQL
77. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Map Reduce map and reduce functions common in functional programming MapReduce: framework for concurrent, distributed processing of large data sets (Google) map and reduce defined in design documents map Kerstin Puschke NoSQL
78. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Map Reduce map and reduce functions common in functional programming MapReduce: framework for concurrent, distributed processing of large data sets (Google) map and reduce defined in design documents map input: one document Kerstin Puschke NoSQL
79. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Map Reduce map and reduce functions common in functional programming MapReduce: framework for concurrent, distributed processing of large data sets (Google) map and reduce defined in design documents map input: one document computes key-value pairs for view Kerstin Puschke NoSQL
80. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Map Reduce map and reduce functions common in functional programming MapReduce: framework for concurrent, distributed processing of large data sets (Google) map and reduce defined in design documents map input: one document computes key-value pairs for view sorted by key Kerstin Puschke NoSQL
81. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Map Reduce map and reduce functions common in functional programming MapReduce: framework for concurrent, distributed processing of large data sets (Google) map and reduce defined in design documents map input: one document computes key-value pairs for view sorted by key reduce (optional) Kerstin Puschke NoSQL
82. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Map Reduce map and reduce functions common in functional programming MapReduce: framework for concurrent, distributed processing of large data sets (Google) map and reduce defined in design documents map input: one document computes key-value pairs for view sorted by key reduce (optional) input: (partial) results of map or of previous calls to reduce Kerstin Puschke NoSQL
83. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Map Reduce map and reduce functions common in functional programming MapReduce: framework for concurrent, distributed processing of large data sets (Google) map and reduce defined in design documents map input: one document computes key-value pairs for view sorted by key reduce (optional) input: (partial) results of map or of previous calls to reduce returns aggregated values Kerstin Puschke NoSQL
84. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Map Function Example Design doc with map Kerstin Puschke NoSQL
85. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Reduce Function Example Design doc with map and reduce Kerstin Puschke NoSQL
86. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Querying View Example View without reduce Kerstin Puschke NoSQL
87. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Querying a View Example View with reduce Kerstin Puschke NoSQL
88. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Querying a View Example View with reduce View with reduce and group_level=2 Kerstin Puschke NoSQL
89. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Example Blogpost with “inline” comments Kerstin Puschke NoSQL
90. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Example Posts and Comments in different docs Kerstin Puschke NoSQL
91. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Example View to query for posts and their comments map-function with composite key function(doc) { if (doc.type == "post") { emit([doc._id, 0], doc); } else if (doc.type == "comment") { emit([doc.post_id, 1], doc); } } Kerstin Puschke NoSQL
92. Introduction Documents Distributed System Queries and Views CouchApps Views Creating Views with Map Reduce Example Example contd. Kerstin Puschke NoSQL
93. Introduction Documents Distributed System Queries and Views CouchApps CouchApps applications living in the database Kerstin Puschke NoSQL
94. Introduction Documents Distributed System Queries and Views CouchApps CouchApps applications living in the database no middleware Kerstin Puschke NoSQL
95. Introduction Documents Distributed System Queries and Views CouchApps CouchApps applications living in the database no middleware data and code are documents: update, fork, backup etc. via replication Kerstin Puschke NoSQL
96. Introduction Documents Distributed System Queries and Views CouchApps CouchApps applications living in the database no middleware data and code are documents: update, fork, backup etc. via replication show/list functions, direct access to attachments (HTML,JavaScript,. . . ) Kerstin Puschke NoSQL
97. Introduction Documents Distributed System Queries and Views CouchApps CouchApps applications living in the database no middleware data and code are documents: update, fork, backup etc. via replication show/list functions, direct access to attachments (HTML,JavaScript,. . . ) load data via AJAX Kerstin Puschke NoSQL
98. Introduction Documents Distributed System Queries and Views CouchApps Q & A Thanks for listening! Questions? Comments? Kerstin Puschke NoSQL
99. Links The CouchDB Project http://couchdb.apache.org Kerstin Puschke NoSQL
100. Links The CouchDB Project http://couchdb.apache.org CouchDB Wiki http://wiki.apache.org/couchdb Kerstin Puschke NoSQL
101. Links The CouchDB Project http://couchdb.apache.org CouchDB Wiki http://wiki.apache.org/couchdb Book: CouchDB - The Definitive Guide http://guide.couchdb.org Kerstin Puschke NoSQL
102. Links The CouchDB Project http://couchdb.apache.org CouchDB Wiki http://wiki.apache.org/couchdb Book: CouchDB - The Definitive Guide http://guide.couchdb.org CouchApp - framework: Simple JavaScript applications with CouchDB http://couchapp.org Kerstin Puschke NoSQL
103. Links The CouchDB Project http://couchdb.apache.org CouchDB Wiki http://wiki.apache.org/couchdb Book: CouchDB - The Definitive Guide http://guide.couchdb.org CouchApp - framework: Simple JavaScript applications with CouchDB http://couchapp.org Couchbase - free hosting, docs, and more http://www.couchone.com Kerstin Puschke NoSQL