| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
| Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, Patches <pgsql-patches(at)postgresql(dot)org> |
| Subject: | Re: Load Distributed Checkpoints, final patch |
| Date: | 2007-07-03 14:02:57 |
| Message-ID: | 7002.1183471377@sss.pgh.pa.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-patches |
Heikki Linnakangas <heikki(at)enterprisedb(dot)com> writes:
> While thinking about this, I made an observation on full_page_writes.
> Currently, we perform a full page write whenever LSN < RedoRecPtr. If
> we're clever, we can skip or defer some of the full page writes:
I'm not convinced this is safe; in particular, ISTM that a PITR slave
following the WAL log is likely to be at risk if it tries to restart
from the checkpoint you've omitted some full-page-images after. There's
no guarantee it will have flushed pages at the same spots the master did.
regards, tom lane
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Tom Lane | 2007-07-03 14:09:16 | Re: SPI-header-files safe for C++-compiler |
| Previous Message | Tom Lane | 2007-07-03 13:56:42 | Re: [DOCS] rename of a view |