How to Remove White Space in Exchange Database?

Ruchika Srichand
Ruchika Srichand | Updated On - 08 Nov 2021 |

Read time 4 min

There can be several mailboxes in a single Exchange database consisting of inbox, outbox, contacts, calendar, and other folders for each account. At the same time, by the addition of information in these mailboxes, the size of the database increases. But when the user deletes some content from mailboxes, it does not create a free space for new data. Let’s say that you remove 4GB of data from the 30GB Exchange database, the expected size of the database should be 26GB. But, after removing the data, you will notice that the size remains the same, which is 30 GB. However, there would still be 4 GB of space available to add new data. This ‘Available new mailbox size’ is commonly known as whitespace.

More about Whitespace

Although Microsoft professionals suggest that this is not the right term to describe this space, most individuals consider it as Whitespace, as it is available but not visible. Whitespace is the free space area in Exchange databases, which is created after the deletion of an item or object (like a mailbox). The Whitespace is reused by the Exchange database to store new items and objects. However, it will not be visible, as said above. But, you can reclaim this space manually by removing the white space.

How to Find White Space in Exchange?

If you’re familiar with Exchange management shell and PowerShell commands, then there are three ways to find the white space in Exchange Database. You can use the below commands to find white space.

  1. To check white spaces on a mailbox database, use:
    Get-MailboxDatabase < DB Name > -status | Select-Object Server,Name,AvailableNewMailboxSpace
  2. To check white spaces on all mailbox database on a server, use:
    Get-MailboxDatabase –Status –Server < servername > | Select-Object Server,Name,AvailableNewMailboxSpace
  3. To check white spaces on all mailbox database on all server, use:.
    Get-MailboxDatabase -status | Select-Object Server,Name,AvailableNewMailboxSpace

Manual Method to Remove White Space

Talking about the manual methods, there is only one way to remove white space from the Exchange database by using Defragmentation. Now, this process can be carried out online and offline. Below, we have covered both methods in detail.

  • Online defragmentation

    Online database defragmentation process is entirely automatic. You do not need to initiate it; Exchange will automatically run it every night. However, online defragmentation does not reduce the size of the database – it remains same. It removes the expired messages. It also cleans up deleted mailboxes on mailbox store. To reduce the size of the database, you should go for Offline defragmentation.

  • Offline defragmentation

    Offline database defragmentation helps in reduce the size of Exchange database. Using this process, you can compact the size of the database by eliminating the unused storage space. This process creates a new database having no empty pages (it replaces the older ones with the new ones or deletes the older ones). You can perform defragmentation by Eseutil facility. This process improves the efficiency of Exchange database. But you can do this only when you have large amount of free space.

Defragmentation of Exchange Database

You can easily defrag the Whitespace in exchange database with a simple process, which we have described below.

  1. Before starting defrags process, you should ensure that how much amount of white space is available in Exchange database with the below command in Exchange Management Shell.
    Get-MailboxDatabase < Database name > -Status | Format-List Name, DatabaseSize, AvailableNewMailboxSpace
  2. Now after checking you have to dismount your Exchange database.
    Dismount-Database < database name >
  3. Once you have dismounted Exchange database, defragment the databae
    Eseutil /d < database_name >
  4. Now run the defrag the dismounted database and mount the database again.
    Mount-Database < database name >
  5. After all the steps check the white space available in your database after defragmentation.
    Get-MailboxDatabase < Database name > -Status | Format-List Name, DatabaseSize, AvailableNewMailboxSpace

Other Exchange Issues

Apart from its large size, Exchange Database can be affected by many other issues including DDB file corruption. A corrupt EDB file becomes inaccessible to its users. So, the EDB files needs to be repaired at the earliest. But you can try third-party Exchange recovery tools to fix such issues. Kernel for Exchange Server Recovery is an efficient tool in fixing all Exchange related issues including corruption.

Kernel for Exchange Server Recovery Software


The presence of whitespace is not a problem of the Exchange Server. The only thing is that it does not allow to occupy the free space easily. But the manual process to remove white space is not easy for novice users. Only seasoned administrators can perform such tasks. To overcome the problems in an EDB file, you can use Kernel for Exchange Server software and get the corrupt or deleted data.