| From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
|---|---|
| To: | "Saul, Jean Paolo" <paolo(dot)saul(at)verizonconnect(dot)com> |
| Cc: | Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk>, PostgreSQL mailing lists <pgsql-bugs(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: BUG #15609: synchronous_commit=off insert performance regression with secondary indexes |
| Date: | 2019-02-03 23:09:49 |
| Message-ID: | CAH2-Wznx7S75JMGEA1NWO0YAquX+_Lj7zVpC51HhrxQikAki4Q@mail.gmail.com |
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| Lists: | pgsql-bugs |
On Sun, Feb 3, 2019 at 2:45 PM Saul, Jean Paolo
<paolo(dot)saul(at)verizonconnect(dot)com> wrote:
> The last post was too long. I think I have a much more simpler example that is easier to replicate.
This new example is very similar to examples that I have personally
come up with. I have no difficulty explaining why the case with lots
of duplicates is slower, so it doesn't really help.
I cannot account for why you can observe a difference across Postgres
versions, though -- that's what I'm having difficulty with. Are you
sure about that effect? There haven't been any directly relevant
changes in this area in many years.
--
Peter Geoghegan
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