For example, {HEAD ~ web servers} continue to request {TAIL ~ operations} on the database while content is being moved 
For example , { HEAD ~ web servers } continue to request { TAIL ~ operations } on the database while content is being moved
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH