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The Microsoft Exchange information store service shuts down. In the Windows NT application event log, the following event is logged:
Event ID:1112 Source: MSExchangeIS Description: The database has reached the maximum allowed size. Attempting to stop the Microsoft Exchange Information Store.
The Microsoft Exchange information store utilizes the Exchange database engine. The maximum allowed size of a single database in Exchange versions 4.0 and 5.0 is 16 GB (Priv.edb can be 16 GB and Pub.edb can be 16 GB). After the limit is reached, the Exchange database engine stops taking transactions and notifies the information store to shut down.
NOTE: Microsoft Exchange Server 5.5 Enterprise Edition information store databases are not limited to 16 GB; they are limited only by available hardware.
The database (Priv.edb or Pub.edb) that has hit the 16-GB limit must be decreased so that the affected process can be started and remain started.
First, the affected database must be defragmented to reclaim any free space. This can be accomplished by doing the following:
It is a good idea to implement storage limits on user mailboxes in the private information store. Storage limits can be configured through the Exchange Administrator program and will help prevent from the database reaching the 16-GB limit.
For more information about use of personal folders and storage limits, see the online documentation.
NOTE: If users are moved to another server, the information store should be defragmented again by running edbutil /d /ispriv or edbutil /d /ispub so as to reclaim the space used by the users who were moved.
When the Exchange database is committing a transaction from a log file and that transaction, if committed, will make the database surpass the 16-GB limit, the Exchange database engine takes the following steps:
If you are using Exchange Server 5.5 Standard Edition and plan to upgrade to Exchange Server 5.5 Enterprise Edition with unlimited storage, you do not need to defragment the database. Run Setup.exe from the Exchange Server 5.5 Enterprise CD-ROM or Srvmax.exe from the Select CD-ROM.