| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
| Cc: | Magnus Hagander <magnus(at)hagander(dot)net>, Greg Stark <stark(at)mit(dot)edu>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Daniel Gustafsson <daniel(at)yesql(dot)se> |
| Subject: | Re: Online enabling of checksums |
| Date: | 2018-03-03 12:32:20 |
| Message-ID: | CA+Tgmob6kHHm6jvgSQv63QT==5cGfbbaD4W37BmYOmct4NWtYQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Mar 2, 2018 at 6:26 PM, Tomas Vondra
<tomas(dot)vondra(at)2ndquadrant(dot)com> wrote:
> Hmmm, OK. So we need to have a valid checksum on a page, disable
> checksums, set some hint bits on the page (which won't be WAL-logged),
> enable checksums again and still get a valid checksum even with the new
> hint bits? That's possible, albeit unlikely.
No, the problem is if - as is much more likely - the checksum is not
still valid.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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