From: | momjian(at)postgresql(dot)org (Bruce Momjian) |
---|---|
To: | pgsql-committers(at)postgresql(dot)org |
Subject: | pgsql: Update TODO for short header versions: < o Reorder physical |
Date: | 2006-09-16 22:06:55 |
Message-ID: | 20060916220655.14FE79FB24D@postgresql.org |
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Thread: | |
Lists: | pgsql-committers |
Log Message:
-----------
Update TODO for short header versions:
< o Reorder physical storage order to reduce padding?
<
< This involves having the user-specified order of columns
< be different from the physical order. SELECT * would
< need to reorder the physical values to match the
< user-specified ordering.
<
< o Store disk pages with no alignment/padding?
<
< This necessitates adding CPU-required padding when moving
< rows from disk to memory.
<
< One idea is to store the header in network byte order (high bits
< first), and read the high bits to determine the header length.
< http://archives.postgresql.org/pgsql-hackers/2006-09/msg00848.php
> One idea is to create zero-or-one-byte-header versions
> of varlena data types. In involves setting the high-bit and
> 0-127 length in the single-byte header, or clear the high bit
> and store the 7-bit ASCII value in the rest of the byte.
> The small-header versions have no alignment requirements.
> http://archives.postgresql.org/pgsql-hackers/2006-09/msg01372.php
Modified Files:
--------------
pgsql/doc:
TODO (r1.1983 -> r1.1984)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1983&r2=1.1984)
pgsql/doc/src/FAQ:
TODO.html (r1.485 -> r1.486)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.485&r2=1.486)
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