McObject® (Issaquah, WA) has released Perst™, its all-Java object-oriented, open source embedded database that is compatible with the Android mobile device platform. Perst stores data directly in Java objects, eliminating the need for data-packing or unpacking code to map between the application's data model and the database's data model. Perst is a compact embedded database, with a core of only five thousand lines of code. This small footprint imposes little demand on system resources. Perst does not require administration and it supports transactions with the ACID (Atomic, Consistent, Isolated and Durable) properties.

Perst implements specialized collection classes optimized for different data layouts and access patterns. The embedded database has Classic BTree implementation, R-tree indexes for spatially- oriented applications such as GIS and navigation, and main-memory database containers optimized for real-time memory-only access. Perst also has a Patricia Trie index that speeds searches in networking and telephony applications, and a TimeSeries class to efficiently deal with small fixed-size objects. Perst provides optional features such as garbage collection, detection of hanging references, automatic schema evolution, XML import/export utilities, master-slave replication support, and an SQL subset to filter elements of any collection.

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