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Powershell: How to re-provsion the sync DB to resolve the issue that User Profile Synchronization Service fails to start?

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You can use the below script:

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Get-SPDatabase $syncdb=Get-SPDatabase -Id

$syncdb.Unprovision()
$syncdb.Status='Offline'
Get-SPServiceApplication
$upa=Get-SPServiceApplication - Id
$upa.ResetSynchronizationMachine()
$upa.ResetSynchronizationDatabase()
$syncdb.Provision()