This package allows you to store arbitrary Haskell values in and retrieve them from a persistent Lightning Memory-mapped Database on disk.

LMDB is a high-performance ACID-compliant no-maintenance read-optimized key-value store. Any Haskell type with a Serialise instance can be stored in an LMDB database, or used as a key to index one.

This package provides a few different APIs for using LMDB:

• The basic API provides transactional put and get functions to store and retrieve values from an LMDB database.

• The extended API provides many functions similar to those in Data.Map, e.g. lookup, insert, delete, foldr, and so on.

• The View API provides a read-only snapshot of an LMDB database that can be queried from pure code.

• The DBRef API provides a mutable variable similar to IORef that is tied to a particular key in an LMDB database.