HI,
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?
thank you
Jenny


>From: Larry Douzie <cs4482003@yahoo.com>
>To: Tom Lane <tgl@sss.pgh.pa.us>
>CC: pgsql-hackers@postgresql.org
>Subject: Re: [HACKERS] row level lock and table level locks Date: Sun, 7 
>Sep 2003 21:05:49 -0700 (PDT)
>
>Larry Douzie writes:
> > Is there a array or some sort of datastructures that store all the
> > HeapTupleDatas for all rows in the db?
>
>Er, wouldn't that be the database files?
>
>What i mean is, whats the pointer name to this list of HeapTupleDatas?
>
>Tom Lane <tgl@sss.pgh.pa.us> wrote:
>c
>regards, tom lane
>
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Mon, 08 Sep 2003 09:19:15 -0700
"Jenny -" <nat_lazy@hotmail.com>
Re: row level lock and table level locks
"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

Mon, 08 Sep 2003 12:49:51 -0400
Tom Lane <tgl@sss.pgh.pa.us>
Re: row level lock and table level locks 