Extensible Storage Engine (ESE), also known as JET Blue, is an Indexed Sequential Access Method (ISAM) data storage technology from Microsoft. ESE is notably a core of Microsoft Exchange Server and Active Directory. Its purpose is to allow applications to store and retrieve data via indexed and sequential access. Windows Mail and Desktop Search in the Windows Vista operating system also make use of ESE to store indexes and property information respectively.
ESE provides transacted data update and retrieval. A crash recovery mechanism is provided so that data consistency is maintained even in the event of a system crash. Transactions in ESE are highly concurrent making ESE suitable for server applications. ESE caches data intelligently to ensure high performance access to data. In addition, ESE is lightweight making it suitable for auxiliary applications.
The ESE Runtime (ESENT.DLL) has shipped in every Windows release since Windows 2000, with native x64 version of the ESE runtime shipping with x64 versions of Windows XP and Windows Server 2003. Microsoft Exchange, up to Exchange 2003 shipped with only the 32 bit edition, as it was the only supported platform. With Exchange 2007, it ships with the 64 bit edition.
Read more about Extensible Storage Engine: Databases, Tables, Records and Columns, Indexes, Transactions, Cursor Navigation and The Copy Buffer, Query Processing, Logging and Crash Recovery, Backup and Restore, History, Comparison To JET Red
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