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Get-StoreUsageStatistics

Use the Get-StoreUsageStatistics cmdlet to aid in diagnosing performance issues with your servers or databases. Exchange PowerShell reference

From the Exchange PowerShell reference 7 parameters Its page in the reference

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Parameters

7 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the mailbox to get usage statistics from.
-DatabaseThe Database parameter specifies the name of the mailbox database to get usage statistics from (the top 25 largest mailboxes on the specified mailbox database).
-ServerThe Server parameter specifies the Mailbox server to get usage statistics from (the top 25 mailboxes on all active databases on the specified server).
-CopyOnServerThe CopyOnServer parameter specifies the mailbox database copy to get usage statistics from.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-FilterThe Filter parameter uses OPATH syntax to filter the results by the specified properties and values.
-IncludePassiveThe IncludePassive switch specifies whether to include usage statistics from active and passive copies of mailbox databases on the Mailbox server you specified with the Server parameter.