Defragmentation of the Exchange database

Exchange Tip: Defragmentation of the Exchange database

Defragmentation of the Exchange database
Adesh Rampat

Here's the situation: You examine mailbox resources and notice that there are some mailboxes belonging to employees no longer employed with he company. Some may belong to key former employees and need to be kept, so you decide to move these mailboxes to another server and delete the unimportant ones. What happens then to the size of the information store? Does it decrease automatically?

Exchange periodically performs a defragmentation of its databases. Exchange 5.5 and above performs online disk defragmentation on a regular basis. Previous versions of Exchange would require that you perform an offline defragmentation. The results of disk defragmentation would be logged in the application event log and would appear in the following format:

Event ID: 1221
Source: MSExchangeIS Private
Type: Information
Category: General
Description: The database has 100 megabytes of free space after online defragmentation has terminated.

Sometimes, though, after moving or deleting mailboxes that used up a large amount of disk space, it may be necessary to perform an offline defragmentation. The ESEUTIL command can perform this operation. But before running this command, do a backup first, and stop the information store service.

To defragment the private information store perform the following:
     eseutil /d /ispriv.

To defragment the public information store perform the following:
     eseutil /d /ispub.


Adesh Rampat has 10 years experience with network and IT administration. He is a member of the Association of Internet Professionals, the Institute for Network Professionals, and the International Webmasters Association. He has also lectured extensively on a variety of topics.

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Related Book

Exchange™ 2000 Server Administrator's Bible
Author : Robert Guaraldi, Matthew Often, Sam S. Gill and Paul Guaraldi
Publisher : Hungry Minds
Published : May 2001
Summary :
Exchange 2000 promises to be the most effective, easy to use, and "interoperable" application for messaging and collaboration. The Exchange 2000 Server Bible offers administrators all the information to install and administer Exchange with real-world examples and inside details on mastering related products.


This was first published in June 2001

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