Migrate all Term groups from one MMS to another MMS using PowerShell

Question

I have two managed metadata service applications in the Farm. I want to copy all the groups, term sets and terms with existing GUIDs from one MMS term store to another MMS term store using PowerShell. Is it possible?

Answer 1

Install term set export/import tool WSP from here.

Then use the following PowerShell to export and import Term Groups one by one including all content.

$ver = $host | select version
if ($ver.Version.Major -gt 1) {$host.Runspace.ThreadOptions = "ReuseThread"} 
if ((Get-PSSnapin "Microsoft.SharePoint.PowerShell" -ErrorAction SilentlyContinue) -eq $null) {
    Add-PSSnapin "Microsoft.SharePoint.PowerShell"
}

Export-SPTerms -Group (Get-SPTaxonomySession -Site "https://siteconnectedtosourcemms.com").TermStores[0].Groups["TermGroupName"] -OutputFile "c:\temp\terms.xml"

Import-SPTerms -ParentTermStore (Get-SPTaxonomySession -Site "https://siteconnectedtodestinationmms.com").TermStores[0] -InputFile "c:\temp\terms.xml"

Answer 2

What could be the solution for error you mentioned above

"Failed to read from or write to database. Refresh and try again. If the problem persists, please contact the administrator"

I am using different script but during the test I deleted terms few times and not getting this error. I want to import terms with the same IDs, how can I get rid of these IDs in the database or in other words clean up MMS database ? Any idea ? Thanks in advance. @Jussi