There's a project to have LMDB as a backend for sqlite. It originates in the LMDB author's (Howard Chu) own work. https://lumosql.org/src/lumosql/doc/trunk/RE

There's a project to have LMDB as a backend for sqlite. It originates in the LMDB author's (Howard Chu) own work. https://lumosql.org/src/lumosql/doc/trunk/README.md https://lumosql.org/src/lumosql/doc/trunk/README.md Also https://www.actordb.com/ https://www.actordb.com/ uses LMDB with a sql queries. (Not sure if sqlite or not)