Steve Jones - Editor (2/20/2009)
SQL does mark the physical records in a heap, AFAIK, with something to be sure they are unique.
RID (Row Identifier). An 8 byte combination of File ID, Page ID and Slot Index. It's stored in nonclusters as the row's address, not in the heap itself.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability