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

Question

When creating a new site column of the managed meta data type in SharePoint2010, and you select "customize your term set", you are presented with one of the following errors:
- This operation cannot be completed. The term store may be unavailable.
- Failed to read from or write to database. Refresh and try again. If the problem persists, please contact the administrator

Answer 1

Hi,
I have been facing the same issue, however managed to resolve it.
This is due to the uncommitted statements. From Powershell try running the following script
#Connect to Central Admin, Replace the url with the environment specific URL
$taxonomySite = get-SPSite http://centraladmin:40000
#Connect to Term Store in the Managed Metadata Service Application, Ensure you put the right Metadate service application name
$taxonomySession = Get-SPTaxonomySession -site $taxonomySite
$termStore = $taxonomySession.TermStores["Managed Metadata Service"]
write-host "Connection made with term store -"$termStore.Name
#Connect to the Group and Term Set
$termStore.RollbackAll()
Hope it would help