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upscaledb

Embedded key/value database with analytical functions

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upscaledb is an embedded key/value database engine that developers link directly into an application, storing a set of sorted key/value databases in a single file or in memory. Each database uses a parameterized B-Tree index optimized for the configured key and value types, supporting fast reads, writes, and scans. It provides ACID transactions, transparent encryption, compression, database cursors, and SQL-style analytical functions such as SUM, AVERAGE, and COUNT computed directly in the B-Tree.

The engine is written in C/C++ with APIs for C/C++, Java, Python, .NET, Erlang/Elixir, and PHP. It supports fixed and variable length keys, record-number databases, duplicate keys, and client/server access, and can run on desktops, cloud instances, mobile devices, and other embedded systems. upscaledb is released under the Apache Public License 2.0 and is free for commercial and non-commercial use.

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