"Derby is an open source, fully functional relational database management system. It supports many of the features found only in high-end, commercial database engines, such as transactions. Derby itself is written in Java, so it is amenable to the needs of Java programmers. Another important Derby attribute is its really light footprint (about 2MB RAM) that obviates the need for very powerful host machines. Indeed, this light footprint means that we can expect to see Derby programs running on low-end, resource-constrained devices such as PDAs, mobile phones, and so on. This will allow for a whole new generation of sophisticated data-centric applications on such devices".

My bolding.

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