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mongodb刚刚发布了其2.4版本，是目前最新的稳定版。此版本包括了一些性能优化，功能增强以及bug修复。更细节的信息可以查看下面几个链接：
- 2.4 release notes
- MongoDB Downloads
- MongoDB 2.4 webinars
下面是MongoDB
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2.4 版本的一些主要功能点：
- Hash-based Sharding
- Capped Arrays
- Text Search (Beta)
- Geospatial Enhancements
- Faster Counts
- Working Set Analyzer
- V8 JavaScript engine
- Security
Hash-based
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Capped Arrays: 此版本还提供了对Array类型截断操作。在使用$push 操作符向一个Array 中添加数据时，你可以再通过新增的$slice操作符指定将这个Array 进行指定长度的截断。这样可以让一个Array保持在一个固定的长度。在此操作中，你还可以指定一个排序方法，在截断前将Array 先进行排序，截取排序后的头或尾来。
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Text Search: 全文索引是此次改造最大的功能改进点，目前支持15种语言的全文索引，详情可见这篇博文.
Geo Capabilities: MongoDB 2.4 引入了GeoJSON的支持，GeoJSON能够提供更精确的地理位置索引。
Faster Counts: MongoDB 2.4 对Count操作进行了各式各样的优化，使得在很多场景下Count操作能够比过去更快。比如在b-tree的一个分支中，如果第一个元素和最后一个元素都在count条件满足的范围内，那么中间的元素肯定都在此范围内，就不再做挨个的遍历操作了。
Working Set Analyzer: 容量规划一直是使用MongoDB
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cluster时需要特别关心的一件事。在2.4版本中，MongoDB提供了一个分析模块，可以让你实时查看到当前的资源使用状况。通过这一模块，你能够知道过去15分钟内MongoDB需要的内存页数，通过对这个数据进行持续监控，你能够及时发现内存不够用的趋势，并着手进行相应的扩容和调整。
New V8 Engine: MongoDB 2.4 中，将内部的JavaScript引擎切换到了Google Chrome使用的V8引擎上，V8引擎的引入，可以有效提升MongoDB的并发性能。
Security: MongoDB 2.4 中增加了两个方面的案例性增强，引入了 Kerberos Authentication 和 Role Based Access Control 两种机制. Kerberos 是 MongoDB 企业版的安全机制，能够支持企业级系统的权限认证。Role Based Access Control 允许更细粒度的权限管理。
本版本一共进行了数百项改进(692项)，本文当然无法一一列举，详细的列表你可以在 changelog 中进行查看。
来源：blog.mongodb.org
原文地址：MongoDB 2.4版本发布, 感谢原作者分享。
