也可以在数据库系统没有离线的情况下执行离线备份，方法是当复制数据库目录的时候冻结系统（阻塞所有写操作）。
Offline backup can also be performed without bringing the database system offline by freezing the system (blocking all write operations) while copying the database directory.
Derby数据库系统(二进制文件和数据库)可以复制到任何带有J2SE JVM的平台，并且无需重新编译或作其他修改就能运行。
A Derby database system (binaries and database) can be copied to any platform with a J2SE JVM and run without performing a rebuild or other alterations.
在分布式数据库系统中，数据库复制对于系统的可靠性及效率起着非常关键的作用。
In distributed database systems, database systems for the reproduction of the reliability and efficiency play a very crucial role.
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