【IT168 资讯】Apache CouchDB是个免费、开源、面向文档的数据库，使用Erlang语言编写，可以使用JavaScript以MapReduce的风格查询、索引CouchDB。CouchDB是个NoSQL解决方案，用于local replication并且可以垂直扩展到多种设备上。在经过多个月的开发后，近日Apache CouchDB1.1.1终于破茧而出了。
CouchDB提供了一个RESTful JSON API，支持HTTP请求的环境都可以访问。有很多用各种编程语言编写的第三方客户端程序库简化了对CouchDB的访问。可以通过HTTP请求使用CouchDB内置的Web管理控制台直接与数据库交互。
CouchDB使用Erlang语言编写，Erlang是一种健壮的函数式编程语言，非常适合于构建并发的分布式系统。Erlang的设计非常灵活，其可伸缩性与可扩展性都非常棒。
作为Apache软件基金会优异项目的CouchDB是个非关系型数据库，使用简单的键——值对的形式来存储数据。数据是使用JSON存储的，可以通过HTTP请求查询。
新版本的重点改进：
* Support SpiderMonkey 1.8.5
* Add configurable maximum to the number of bytes returned by _log.
* Allow CommonJS modules to be an empty string.
* Bump minimum Erlang version to R13B02.
* Do not run deleted validate_doc_update functions.
* ETags for views include current sequence if include_docs=true.
* Fix bug where duplicates can appear in _changes feed.
* Fix bug where update handlers break after conflict resolution.
* Fix bug with _replicator where include "filter" could crash couch.
* Fix crashes when compacting large views.
* Fix file descriptor leak in _log
* Fix missing revisions in _changes?style=all_docs.
* Improve handling of compaction at max_dbs_open limit.
* JSONP responses now send "text/javascript" for Content-Type.
* Link to ICU 4.2 on Windows.
* Permit forward slashes in path to update functions.
* Reap couchjs processes that hit reduce_overflow error.
* Status code can be specified in update handlers.
* Support provides() in show functions.
* _view_cleanup when ddoc has no views now removes all index files.
* max_replication_retry_count now supports "infinity".
* Fix replication crash when source database has a document with empty ID.
* Fix deadlock when assigning couchjs processes to serve requests.
* Fixes to the document multipart PUT API.
* Fixes regarding file descriptor leaks for databases with views.
