On Wed, Jul 10, 2019 at 04:11:21PM -0400, Alvaro Herrera wrote:
On 2019-Jul-10, Bruce Momjian wrote:

Uh, what if a transaction modifies page 0 and page 1 of the same table
--- don't those pages have the same LSN.

No, because WAL being a physical change log, each page gets its own
WAL record with its own LSN.


What if you have wal_log_hints=off? AFAIK that won't change the page LSN.

regards

--
Tomas Vondra                  http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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