Couchbase Server 2.0.1企业版主要的改进有5点：
1. Improved rebalance operation time for key-value use cases.
2. Performance optimizations to cap view / index file size growth during rebalance.
3. New low and high watermark thresholds to increase usable memory.
4. Stability fixes to drastically improve timeout problems seen by the cluster manager due to Erlang VM settings.
5. Significant performance improvements to view / index building particularly useful during initial load.
详细的信息可以看这里：http://www.couchbase.com/docs/couchbase-manual-2.0/couchbase-server-rn_2-0-0l.html
Couchbase Server是一个面向文档的分布式的NoSQL数据库管理系统，此系统结合了CouchDB的简单性和可靠性以及Memcached的高性能，再加上Membase的伸缩性。
下载地址：http://www.couchbase.com/download