Open Source Database Engines in C#

db4o

db4o (database for objects) is the embeddable open source object database for C#. Features include: fast native C# object persistence, ACID transactions, Native Queries, automatic class schema recognition, small footprint, zero administration.

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DeveelDB

DeveelDB is a full embeddedable SQL database management system for .NET and Mono frameworks, managing small to large amount of data with a wide support for complex types. Some of the key features of this project are: - the strong transactional system for isolated operations an efficient memory management to reduce the impact on the runtime - its open architecture, to permit development of modules and features - a small footprint: the core library is ~1Mb

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EffiProz Database

EffiProz is a pure C# database based on popular HSQL database engine. In future EffiProz will add support for Mono framework and .Net compact frameworks.

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System.Data.SQLite

System.Data.SQLite is an enhanced version of the original SQLite database engine. It is a complete drop-in replacement for the original sqlite3.dll (you can even rename it to sqlite3.dll). It has no linker dependency on the .NET runtime so it can be distributed independently of .NET, yet embedded in the binary is a complete ADO.NET 2.0 provider for full managed development.

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