| From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
|---|---|
| To: | Konstantin Knizhnik <k(dot)knizhnik(at)postgrespro(dot)ru> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, 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>, 萧少聪(铁庵) <shaocong(dot)xsc(at)alibaba-inc(dot)com> |
| Subject: | Re: [Proposal] Global temporary tables |
| Date: | 2020-01-29 17:08:35 |
| Message-ID: | CAFj8pRB50gSeoNqnkqYkHMN3V74RQFRMPwCkkO9bseFgVLn32Q@mail.gmail.com |
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2. Actually I do not propose some completely new approach. I try to
> provide behavior with is compatible with regular tables.
> If you create index for regular table, then it can be used in all
> sessions, right?
>
I don't understand to this point. Regular tables shares data, shares files.
You cannot to separate it. More - you have to uses relatively aggressive
locks to be this operation safe.
Nothing from these points are valid for GTT.
Regards
Pavel
> And all "various backend-local data structures in the relcache, the
> planner, and the executor that remember information about indexes"
> have to be properly updated. It is done using invalidation mechanism.
> The same mechanism is used in case of DDL operations with GTT, because
> we change system catalog.
>
> So my point here is that creation index of GTT is almost the same as
> creation of index for regular tables and the same mechanism will be used
> to provide correctness of this operation.
>
>
> --
> Konstantin Knizhnik
> Postgres Professional: http://www.postgrespro.com
> The Russian Postgres Company
>
>
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