Koichi Suzuki <suzuki.koichi@oss.ntt.co.jp> writes:
> Tom Lane wrote:
>> Doesn't this break crash recovery on PITR slaves?
> Compressed archive log contains the same data as full_page_writes off
> case. So the influence to PITR slaves is the same as full_page_writes off.
Right. So what is the use-case for running your primary database with
full_page_writes on and the slaves with it off? It doesn't seem like
a very sensible combination to me.
Also, it seems to me that some significant performance hit would be
taken by having to grovel through the log files to remove and re-add the
full-page data. Plus you are actually writing *more* WAL data out of
the primary, not less, because you have to save both the full-page
images and the per-tuple data they normally replace. Do you have
numbers showing that there's actually any meaningful savings overall?
regards, tom lane
