![]() "Empress Offers an Effective Embedded Database Solution", 2005. "COTS Databases For Embedded Systems" Archived at the Wayback Machine, Embedded Computing Design magazine, January, 2007. ![]() As of 2013 the OpenLDAP Project is deprecating the use of Berkeley DB, in favor of LMDB. LMDB is distributed by the OpenLDAP Project under the OpenLDAP Public License. Third-party wrappers exist for C++, Erlang and Python. Readers don't block writers and writers don't block readers, so read performance scales perfectly linearly across arbitrarily many threads and CPUs. The library is optimized for high read concurrency readers need no locks at all. The library implements B+trees with multiversion concurrency control (MVCC), single-level store, Copy on write and provides full ACID transactions with no deadlocks. The library is extremely compact, compiling down to under 40KB of x86 object code, being usually faster than similar libraries like Berkeley DB, LevelDB, etc. It is written in C and the API is modeled after the Berkeley DB API, though much simplified. Lightning Memory-Mapped Database (LMDB) is a memory-mapped key-value database for the OpenLDAP Project. Main article: Lightning Memory-Mapped Database The main advantage of Firebird embedded databases is, that unlike SQLite or Access databases, they can be plugged into a full Firebird server without any modifications at all also is multiplatform (runs on Linux, OS X with full ASP.NET Mono support)įirebird is not truly embedded since it can not be statically linked It exports the standard Firebird API entry points. So Firebird embedded acts as a local server for one threaded client accessing its databases (that means it works properly for ASP.NET web applications, because there, each user has its own thread, which means two users could access the same database at the same time, but they would not be in the same thread, because ASP.NET opens a new thread for each user). It has the same features as the classic and superserver version of Firebird, two or more threads (and applications) can access the same database at the same time starting with Firebird 2.5. As an open source fork of InterBase, it is ACID compliant, supports triggers and stored procedures, and is available on Linux, OSX and Windows systems.
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