| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Jan Wieck <janwieck(at)yahoo(dot)com>, Russell Smith <mr-russ(at)pws(dot)com(dot)au>, Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Idea for getting rid of VACUUM FREEZE on cold pages |
| Date: | 2010-06-08 23:07:05 |
| Message-ID: | 1276038360-sup-4047@alvh.no-ip.org |
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| Lists: | pgsql-hackers |
Excerpts from Tom Lane's message of mar jun 08 18:35:00 -0400 2010:
> But none of this accomplishes a damn thing towards the original goal,
> which was to avoid an extra disk write associated with freezing (not
> to mention an extra write for setting the transaction-committed hint
> bit). Setting a bit is no cheaper from that standpoint than changing
> the xmin field.
... unless the bit is outside the page itself -- so we get back to the
idea of a freeze map.
--
Álvaro Herrera <alvherre(at)commandprompt(dot)com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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