| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Kevin Grittner <kgrittn(at)ymail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Timothy Garnett <tgarnett(at)panjiva(dot)com>, PostgreSQL Bugs <pgsql-bugs(at)postgresql(dot)org> |
| Subject: | Re: Re: BUG #12990: Missing pg_multixact/members files (appears to have wrapped, then truncated) |
| Date: | 2015-05-06 14:17:03 |
| Message-ID: | 20150506141703.GS2523@alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-bugs |
I haven't read your patch, but I wonder if we should decrease the
default value of multixact_freeze_table_age (currently 150 million).
The freeze_min_age is 5 million; if freeze_table_age were a lot lower,
the problem would be less pronounced.
Additionally, I will backpatch commit 27846f02c176. The average size of
multixacts decreases with that fix in many common cases, which greatly
reduces the need for any of this in the first place.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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