| From: | "osumi(dot)takamichi(at)fujitsu(dot)com" <osumi(dot)takamichi(at)fujitsu(dot)com> |
|---|---|
| To: | "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com>, 'Kyotaro Horiguchi' <horikyota(dot)ntt(at)gmail(dot)com> |
| Cc: | "sfrost(at)snowman(dot)net" <sfrost(at)snowman(dot)net>, "masao(dot)fujii(at)oss(dot)nttdata(dot)com" <masao(dot)fujii(at)oss(dot)nttdata(dot)com>, "ashutosh(dot)bapat(dot)oss(at)gmail(dot)com" <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | RE: In-placre persistance change of a relation |
| Date: | 2020-11-13 07:15:41 |
| Message-ID: | OSBPR01MB48880392945A391332DDB65CEDE60@OSBPR01MB4888.jpnprd01.prod.outlook.com |
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| Lists: | pgsql-hackers |
Hello, Tsunakawa-San
> Do you know the reason why data copy was done before? And, it may be
> odd for me to ask this, but I think I saw someone referred to the past
> discussion that eliminating data copy is difficult due to some processing at
> commit. I can't find it.
I can share 2 sources why to eliminate the data copy is difficult in hackers thread.
Tom's remark and the context to copy relation's data.
https://www.postgresql.org/message-id/flat/31724(dot)1394163360%40sss(dot)pgh(dot)pa(dot)us#31724(dot)1394163360(at)sss(dot)pgh(dot)pa(dot)us
Amit-San quoted this thread and mentioned that point in another thread.
https://www.postgresql.org/message-id/CAA4eK1%2BHDqS%2B1fhs5Jf9o4ZujQT%3DXBZ6sU0kOuEh2hqQAC%2Bt%3Dw%40mail.gmail.com
Best,
Takamichi Osumi
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