|Component:||Microsoft Exchange Extensible Storage Engine|
|Message:||process name (process id) instanceThe database engine started a new instance (number).|
There is only one Jet database engine, ESE.dll, per server. However, there can be one instance of Jet running per storage group. Event 102 signifies that an instance of Jet has started and indicates which instance has started. Event 103 indicates which instance has stopped. These events can occur in the normal scheme of Exchange operations, or they may be associated with errors. Event 103 never has an error mentioned in the Description section of the event.
Event 104 definitely indicates there is a problem and the named instance of Jet has stopped with a definite error associated with it, which is named in the Description section of Event 104.
Event ID 103 has many potential causes – check events in the Application log before and after Event 103 to determine which errors are mentioned in the Description section of other events. Known causes for the database instance stopping with event 103 are as follows:
Event ID 104 has a definite set of potential causes. The most likely causes are indicated in the Description section of event 104: