| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Peter Geoghegan <pg(at)heroku(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com> |
| Subject: | Re: Hard limit on WAL space used (because PANIC sucks) |
| Date: | 2013-06-07 16:59:42 |
| Message-ID: | 25149.1370624382@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> writes:
> On 07.06.2013 19:33, Tom Lane wrote:
>> Not only is that a horrible layering/modularity violation, but surely
>> LockBuffer can have no idea how much WAL space will be needed.
> It can be just a conservative guess, like, 32KB. That should be enough
> for almost all WAL-logged operations. The only exception that comes to
> mind is a commit record, which can be arbitrarily large, when you have a
> lot of subtransactions or dropped/created relations.
What happens when several updates are occurring concurrently?
regards, tom lane
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