Apache Open Source Project--derby

Apache Derby is an open source database management system developed by the Apache Software Foundation ; Because Derby is a pure Java program, it requires only the operating system to support the Java Virtual machine, which Derby can execute.

Derby is specifically optimized for the Java environment, and Derby itself is not only a pure Java program, but Derby can compile SQL into Java bytecode and execute it as a Java virtual machine when executing a user's SQL program. Because the Java bytecode that the SQL program translates to can be translated dynamically by JIT, Derby may have better performance than the traditional database management system.

Other features include:

• Supports master-slave architecture or embedded environment
• Multithreading
• ACID
• Java database Connection (JDBC)
• Low system requirements: approximately 2 MB of hard disk space, compressed after only a fewKB

Apache Open Source Project--derby