| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Zeugswetter Andreas DAZ SD" <ZeugswetterA(at)spardat(dot)at> |
| Cc: | "Hannu Krosing" <hannu(at)skype(dot)net>, "Satoshi Nagayasu" <nagayasus(at)nttdata(dot)co(dot)jp>, "Simon Riggs" <simon(at)2ndquadrant(dot)com>, josh(at)agliodbs(dot)com, pgsql-hackers(at)postgresql(dot)org, "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com> |
| Subject: | Re: Pre-allocated free space for row |
| Date: | 2005-09-01 12:42:12 |
| Message-ID: | 11756.1125578532@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
"Zeugswetter Andreas DAZ SD" <ZeugswetterA(at)spardat(dot)at> writes:
> The bgwriter could "update" all columns of dead heap tuples in heap
> pages
> to NULL and thus also gain free space without the need to touch the
> indexes.
> The slot would stay used but it would need less space.
Not unless it's running a transaction (consider TOAST updates).
regards, tom lane
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