From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
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To: | PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org> |
Subject: | Adding index flag showing tuple status |
Date: | 2001-05-17 15:50:07 |
Message-ID: | 200105171550.f4HFo7B02510@candle.pha.pa.us |
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Lists: | pgsql-hackers |
I am looking at adding an index tuple flag to indicate when a heap tuple
is expired so the index code can skip looking up the heap tuple.
The problem is that I can't figure out how be sure that the heap tuple
doesn't need to be looked at by _any_ backend. Right now, we update the
transaction commit flags in the heap tuple to prevent a pg_log lookup,
but that is not enough because some transactions may still see that heap
tuple as visible.
Vacuum has a complex test that looks a currently running transactions
and stuff. Do I have to duplicate that test in the new code? Seems I
do.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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