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Welcome to the HDB Open Source project

HDB is a small, flexible and efficient hybrid database, a mix between a filesystem and a database. It comes with a wide support of command line utilities for manipulating and extracting data. It's designed for both embedded and bigger systems. It currently runs on Linux and has interfaces to C, C++, Java and Perl.

Why

HDB aims to fill the gap when storing data in a relational database is too rigid and storing data in textfiles is too cumbersome. A typical example would be when you have hierarchical data such as XML or configuration data that you want to store and retrieve in a flexible manner.

Features

• Scalable to terabytes of data, billions of records
• Locking using multiple readers single writers
• Comes with client-server for multiple applications or direct file access API
• Zero administartion
• Uses BerkeleyDB for underlying storage (db185, db3, db4)
• Small code footprint
• Source code availability
• Simple yet powerful C-API with wrappers to Java and Perl
• Wide variety of command line applications
• Works well with other UNIX command line applications
• Supports regular expression and globbing to query data
• Regression test suite and example source included
• Features can be added and removed using autoconf