Enterprise Communications Support formerly “Exchange Messaging Support” has recently seen an increase in support incidents around the -519 Jet_errLogSequenceEnd issue. In this blog I will explain this issue in detail, why it may occur, how to recognize it, and what to do next.

Exchange has had a robust data engine that provides an ACID database from the early days; the transaction-based JET database engine ensures all database changes are Atomic, Consistent, Isolated and Durable. We accomplish this with the use of transaction log files. In Exchange Server 2000 and 2003, we introduced the concept of Storage Groups. Storage Groups can contain up to 5 databases, but share one set of common Transaction Logs.

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