Exception calling "ChangeDatabaseInstance" with "1" argument(s)

PS C:\Users\admin> $db.ChangeDatabaseInstance("DBNAME")
Exception calling "ChangeDatabaseInstance" with "1" argument(s): "An update
conflict has occurred, and you must re-try this action. The object SPServer
Name=SERVERNAME was updated by admin, in the powershell (2572)
process, on machine SERVERNAME.  View the tracing log for more information
about the conflict."
At line:1 char:1



Solution: Clear the Cache

Run the below script

Add-PSSnapin -Name Microsoft.SharePoint.PowerShell –erroraction SilentlyContinue

Stop-Service SPTimerV4
$folders = Get-ChildItem C:\ProgramData\Microsoft\SharePoint\Config
foreach ($folder in $folders)
    {
    $items = Get-ChildItem $folder.FullName -Recurse
    foreach ($item in $items)
        {
            if ($item.Name.ToLower() -eq "cache.ini")
                {
                    $cachefolder = $folder.FullName
                }
               
        }
    }
$cachefolderitems = Get-ChildItem $cachefolder -Recurse
    foreach ($cachefolderitem in $cachefolderitems)
        {
            if ($cachefolderitem -like "*.xml")
                {
                   $cachefolderitem.Delete()
                }
       
        }
       
$a = Get-Content  $cachefolder\cache.ini
$a  = 1
Set-Content $a -Path $cachefolder\cache.ini