On 2020/08/21 12:08, tsunakawa.ta...@fujitsu.com wrote:
From: Fujii Masao <masao.fu...@oss.nttdata.com>
Just idea; it may be worth exposing the number of when new WAL file is
created and zero-filled. This initialization may have impact on
the performance of write-heavy workload generating lots of WAL. If this
number is reported high, to reduce the number of this initialization,
we can tune WAL-related parameters so that more "recycled" WAL files
can be hold.
Sounds good. Actually, I want to know how much those zeroing affected the
transaction response times, but it may be the target of the wait event
statistics that Imai-san is addressing.
Maybe, so I'm ok if the first pg_stat_walwriter patch doesn't expose
this number. We can extend it to include that later after we confirm
that number is really useful.
Regards,
--
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION
