Apache Derby 10.11.1.1 发布，此版本现已提供下载，更新内容如下：
* MERGE statement - MERGE is a single, join-driven statement which INSERTs, UPDATEs, and
DELETEs rows.
* Deferrable constraints - Constraint enforcement can now be deferred, typically to the
end of a transaction.
* WHEN clause in CREATE TRIGGER - An optional WHEN clause has been added which determines
which rows fire a trigger.
* Rolling log file - The Derby diagnostic log can now be split across a sequence of files.
* Experimental Lucene support - Derby text columns can now be indexed and queried via
Apache Lucene.
* Simple case expression - The "simple" and "extended" syntax for CASE expressions has
been added.
* Better concurrency for identity columns - The concurrency of identity columns has been
boosted.
* New ij HoldForConnection command - A new ij command has been added to change the default
cursor holdability.
* Standard syntax for altering column nullability - Standard syntax has been added for
altering the nullability of columns.
Apache Derby是Apache软件基金会所研发的开放源码数据库管理系统；由于Derby是一个纯Java程式，因此只需要操作系统支援Java虚拟机，Derby便可执行。
Derby是特别地为Java环境进行优化，Derby本身不仅是一个纯Java程式，而且Derby在执行用户的SQL程式时，能够把SQL编译成Java bytecode并以系统的Java虚拟机执行。由于SQL程式转成的Java bytecode能被JIT动态翻译，因此Derby可能比传统的数据库管理系统更佳的性能。
其他特性包括：
支援 主从架构 或 嵌入 环境
多线程
ACID
Java数据库连接 (JDBC)
低系统需求：约占 2 MB 的硬盘空间，压缩后更只是600KB
软件详情：3C20140827125045.6198F11791@minotaur.apache.org[/email]%3E]http://mail-archives.apache.org/mod_mbox/www-announce/201408.mbox/%3C20140827125045.6198F11791@minotaur.apache.org%3E
下载地址：http://db.apache.org/derby/derby_downloads.html
来自:开源中国社区
