process name (process id) %3The database name has reached its maximum size of number MB. If the database cannot be restarted, an offline defragmentation may be performed to reduce its size.

Details
Product: Exchange
Event ID: 445
Source: ESE
Version: 6.5.6940.0
Component: Microsoft Exchange Extensible Storage Engine
Message: process name (process id) %3The database name has reached its maximum size of number MB. If the database cannot be restarted, an offline defragmentation may be performed to reduce its size.
   
Explanation

The disk volume that contains an Exchange database has reached the maximum allowed database size.

Exchange Server 2003 Standard Edition has the following limitations regarding mailbox stores and public folder stores:

  • Four storage groups.
  • Five databases per storage group.
  • One mailbox store database.
  • One public folder store database that is associated with a MAPI clients public folder tree.
  • Additional public folder stores. Each public folder store is associated with a general-purpose public folder tree.
  • Maximum 16-gigabyte (GB) limit per database.

When you exceed the 16-GB limit on any database, the Microsoft Exchange Information Store service shuts down automatically.

   
User Action

If you have exceeded the 16-GB database limit, you can temporarily increase the database size limit to 17 GB, and then restart the Microsoft Exchange Server Information Store service. Temporarily increasing the maximum size of the information store to 17 GB allows the Exchange database to mount while you reduce the amount of data on the database.

Important   To enable this functionality in Exchange Server 2003 Standard Edition, you must create the required new registry value.

For detailed information about how to temporarily increase the database size and resolve this error, see Microsoft Knowledge Base article 828070, “Exchange Server Mailbox Store Does Not Mount When the Mailbox Store Database Reaches the 16-GB Limit” at http://go.microsoft.com/fwlink/?LinkId=3052&kbid=828070.

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