upscaledb is an embedded key/value database engine. "Embedded" means that as a software developer, you can link it directly into your application. A variety of programming environments is supported. The upscaledb library is developped in C/C++, but can be used from .NET, Java, Erlang, Elixir and Python.

upscaledb (old name Hamsterdb) is an embedded key/value database engine. "Embedded" means that as a software developer, you can link it directly into your application. A variety of programming environments is supported. The upscaledb library is developped in C/C++, but can be used from .NET, Java, Erlang, Elixir and Python.

upscaledb stores a set of databases (sorted key/value lists) in a single file, or in-memory. The databases are optimized for fast reads and writes, and even faster scans.

Each database is stored in a B-Tree index structure. These tree-like structures automatically sort the keys, and are optimized for fast reads and writes. In addition, upscaledb B-Trees are parameterized, which means that you can configure a database to store specific keys and values (strings, integers etc). The B-Tree will then be optimized for this type.

The configured type allows upscaledb to perform analytical calculations like SUM, AVERAGE and COUNT directly in the B-Tree, without copying the key/value pairs to the application.

In addition, upscaledb supports ACID transactions, transparent encryption, compression an many other features that help you to create powerful applications without worrying about your data.

New Release
New Features
Added a new API function for bulk operations (ups_db_bulk_operations in ups/upscaledb_int.h)
Bugfixes
Fixed compiler error related to inline assembly on gcc 4.8.x
Fixed bug when ups_cursor_overwrite would overwrite a transactional record instead of the (correct) btree record
Fixed several bugs in the duplicate key consolidation
issue #80: fixed streamvbyte compilation for c++11
issue #79: fixed crc32 failure when reusing deleted blobs spanning multiple pages
Fixed a bug when recovering duplicates that were inserted with one of the UPS_DUPLICATE_INSERT_* flags
Minor improvements for the journalling performance
Fixed compilation issues w/ gcc 6.2.1 (Thanks, Roel Brook)
[ Hamsterdb release history ]

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