() The database engine … started.

Details
Product: Exchange
Event ID: 100
Source: ESE
Version: 6.5.6940.0
Component: Microsoft Exchange Extensible Storage Engine
Message: <process name> (<process id>) <instance>The database engine <value>.<value>.<value>.<value> started.
   
Explanation

ESE Event ID 100 indicates that the database engine started.

ESE Event ID 101 indicates that the database engine stopped.

ESE Event ID 100 is usually followed by a series of other ESE events describing an online restore, or mounting of Exchange store databases. If an online restore fails to complete, or a database fails to mount, you could receive an Event ID 101, indicating that the database engine has stopped. You could also receive this event when an Exchange store dismounts for any reason. If you try to mount the store again and the store fails to mount, you may receive Event ID 100 indicating the database engine started, and then again receive Event ID 101, indicating the database engine failed to start. In Exchange System Manager, if the arrow points down and is red, which displays on the Exchange System Manager icon, this indicates that the stores are dismounted.

In summary, receiving ESE Event ID 100 simply means that the database engine started. It does not mean the Exchange store will mount, because it may be followed by an ESE Event ID 101, which means the database engine stopped. In this case, the store failed to mount. The reasons for ESE Event ID 101 are many and varied. These events by themselves are generic for restoring and for mounting of the information store databases.

For examples of causes, there may not be enough permissions on the directory where the database or logs exist to mount the store. There may be missing log files on the production, or in an online restore, there may be old log files that are out of sequence with the log that is mentioned in Restore.env file. There may be file-level virus scanning software running against the log file directory.

   
User Action

In normal operations, if you receive ESE Event ID 100 or ESE Event 101, and Exchange is functioning normally, no user action is required. However, if an online-aware restore of Exchange fails, or an Exchange database fails to mount as expected, then ESE Event ID 101 indicates that a problem with the database or its logs may exist. Check the application log and the system log for related events to determine the exact sequence of events that lead up to ESE Event ID 101.

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