Horton

Re: Big 7.1 open items

Bruce Momjian <pgman@candle.pha.pa.us>

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From: Bruce Momjian <pgman@candle.pha.pa.us>
To: Bruce Momjian <pgman@candle.pha.pa.us>
Cc: Jan Wieck <JanWieck@Yahoo.com>, Tom Lane <tgl@sss.pgh.pa.us>, Hiroshi Inoue <Inoue@tpf.co.jp>, Bruce Momjian <maillist@candle.pha.pa.us>, PostgreSQL-development <pgsql-hackers@postgresql.org>, "Ross J. Reedstrom" <reedstrm@rice.edu>
Date: 2000-06-18T13:33:44Z
Lists: pgsql-hackers 
> I haven't figured out extent locations yet.  One idea is to allow
> administrators to create symlinks for tables >1 gig, and to not remove
> the symlinks when a table shrinks.   Only remove the file pointed to by
> the table, but leave the symlink there so if the table grows again, it
> can use the symlink.  lstat() would allow this.

OK, I have an extent idea.  It is:

	CREATE LOCATION tabloc IN '/var/private/pgsql' EXTENT2
'/usr/pg'.

This creates an /extents directory in the location, with extents/2
symlinked to /usr/pg:

	data/base/mydb/tabloc
	data/base/mydb/tabloc/extents/2

When extending a table, it looks for an extents/2 directory and uses
that if it exists. Same for extents3.  We could even get fancy and
round-robin through all the extents directories, looping around to the
beginning when we run out of them.  That sounds nice.

-- 
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