JET Red and ESE. JET Red is a file sharing technology, while ESE is designed to be embedded in a server application, and does not share files. JET Red makes best effort file recovery, while ESE has write ahead logging and snapshot isolation for guaranteed crash recovery. JET Red before version 4.0 supports only page level locking, while ESE and JET Red version 4.0 supports record level locking. JET Red supports a wide variety of query interfaces, including ODBC and OLE DB. ESE does not ship with a query engine but instead relies on applications to write their own queries as C ISAM code. JET Red has a maximum database file size of 2 GiB, while ESE has a maximum database file size of 8 TiB with 4 KiB pages, and 16 TiB with 8 KiB pages. References External links Database engines Formerly proprietary software Microsoft application programming interfaces Microsoft database software Microsoft free software Software using the MIT license