| From: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com> |
|---|---|
| To: | Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> |
| Cc: | Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, Anastasia Lubennikova <a(dot)lubennikova(at)postgrespro(dot)ru>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Paul Guo <guopa(at)vmware(dot)com> |
| Subject: | Re: Performance degradation of REFRESH MATERIALIZED VIEW |
| Date: | 2021-04-26 13:31:02 |
| Message-ID: | 81298edf-9fd0-8da3-7a2d-20f8d6aa5165@enterprisedb.com |
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| Lists: | pgsql-hackers |
Hi,
I took a look at this today, as I committed 39b66a91b back in January. I
can reproduce the issue, with just 1M rows the before/after timings are
roughly 480ms and 620ms on my hardware.
Unfortunately, the v3 patch does not really fix the issue for me. The
timing with it applied is ~610ms so the improvement is only minimal.
I'm not sure what to do about this :-( I don't have any ideas about how
to eliminate this overhead, so the only option I see is reverting the
changes in heap_insert. Unfortunately, that'd mean inserts into TOAST
tables won't be frozen ...
regards
--
Tomas Vondra
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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