"Jenny -" <nat_lazy@hotmail.com> writes:
> I found out that TupleTable stores per-tuple information(it stores
> HeapTupleData) and that also there are multiple TupleTables in the db at a
> time.Based on what are diffrent TupleTables created?
TupleTables are just temporary data structures to hold transiently
created tuples during execution of a query. There's usually one for
each plan node.
regards, tom lane