| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Konstantin Knizhnik <k(dot)knizhnik(at)postgrespro(dot)ru> |
| Cc: | 曾文旌(义从) <wenjing(dot)zwj(at)alibaba-inc(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, 蔡松露(子嘉) <zijia(at)taobao(dot)com>, "Cai, Le" <le(dot)cai(at)alibaba-inc(dot)com>, 张广舟(明虚) <guangzhou(dot)zgz(at)alibaba-inc(dot)com>, 赵殿奎 <diankui(dot)zdk(at)alibaba-inc(dot)com>, 萧少聪(铁庵) <shaocong(dot)xsc(at)alibaba-inc(dot)com> |
| Subject: | Re: [Proposal] Global temporary tables |
| Date: | 2019-10-28 16:29:48 |
| Message-ID: | CA+TgmoYrrm0rasbWJfsh1L52+QnAGYyJL5ZzET0WpbK5-rJUuw@mail.gmail.com |
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On Mon, Oct 28, 2019 at 9:48 AM Konstantin Knizhnik
<k(dot)knizhnik(at)postgrespro(dot)ru> wrote:
> Logically it may be good decision. But piratically support of parallel
> access to GTT requires just accessing their data through shared buffer.
> But in case of local temp tables we need also need to some how share
> table's metadata between parallel workers. It seems to be much more
> complicated if ever possible.
Why? The backends all share a snapshot, and can load whatever they
need from the system catalogs.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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