| From: | Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at> |
|---|---|
| To: | "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com>, 'Masahiko Sawada' <masahiko(dot)sawada(at)2ndquadrant(dot)com> |
| Cc: | Masahiro Ikeda <ikedamsh(at)oss(dot)nttdata(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Muhammad Usama <m(dot)usama(at)gmail(dot)com>, amul sul <sulamul(at)gmail(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Álvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Ildar Musin <ildar(at)adjust(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Chris Travers <chris(dot)travers(at)adjust(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Tatsuo Ishii <ishii(at)sraoss(dot)co(dot)jp> |
| Subject: | Re: Transactions involving multiple postgres foreign servers, take 2 |
| Date: | 2020-07-17 06:49:08 |
| Message-ID: | f44318e1ac5074268f0925e8c6e0619780a71fef.camel@cybertec.at |
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| Lists: | pgsql-hackers |
On Fri, 2020-07-17 at 05:21 +0000, tsunakawa(dot)takay(at)fujitsu(dot)com wrote:
> From: Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com>
> I have briefly checked the only oracle_fdw but in general I think that
> > if an existing FDW supports transaction begin, commit, and rollback,
> > these can be ported to new FDW transaction APIs easily.
>
> Does oracle_fdw support begin, commit and rollback?
Yes.
> And most importantly, do other major DBMSs, including Oracle, provide the API for
> preparing a transaction? In other words, will the FDWs other than postgres_fdw
> really be able to take advantage of the new FDW functions to join the 2PC processing?
> I think we need to confirm that there are concrete examples.
I bet they do. There is even a standard for that.
I am not looking forward to adapting oracle_fdw, and I didn't read the patch.
But using distributed transactions is certainly a good thing if it is done right.
The trade off is the need for a transaction manager, and implementing that
correctly is a high price to pay.
Yours,
Laurenz Albe
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