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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