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Start-DatabaseAvailabilityGroup

Use the Start-DatabaseAvailabilityGroup cmdlet to reincorporate one or more previously failed members of a database availability group (DAG). 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 name of the DAG being started.
-ActiveDirectorySiteThe ActiveDirectorySite parameter specifies whether to start all DAG members in the specified site.
-MailboxServerThe MailboxServer parameter specifies whether to start a single DAG member.
-ConfigurationOnlyThe ConfigurationOnly switch specifies whether to update the Active Directory properties with the start action, but doesn't perform a start of the DAG or any members.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.