Suresh <[EMAIL PROTECTED]> writes:
> What is the time qualification check ?

HeapTupleSatisfiesVisibility().  See
src/include/utils/tqual.h
src/backend/utils/time/tqual.c
and if none of this is making any sense maybe you need to start here:
http://developer.postgresql.org/pgdocs/postgres/mvcc.html

                        regards, tom lane

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