LMDB

Lightning Memory-Mapped Database (LMDB) is an embedded transactional database in the form of a key-value store. LMDB is written in C with API bindings for several programming languages. LMDB stores arbitrary key/data pairs as byte arrays, has a range-based search capability, supports multiple data items for a single key and has a special mode for appending records (MDB_APPEND) without checking for consistency.[1] LMDB is not a relational database, it is strictly a key-value store like Berkeley DB and DBM. https://en.wikipedia.org/wiki/Lightning_Memory-Mapped_Database


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