| From: | "Albe Laurenz" <laurenz(dot)albe(at)wien(dot)gv(dot)at> |
|---|---|
| To: | "Shigeru Hanada *EXTERN*" <shigeru(dot)hanada(at)gmail(dot)com> |
| Cc: | "Kohei KaiGai" <kaigai(at)kaigai(dot)gr(dot)jp>, "Etsuro Fujita" <fujita(dot)etsuro(at)lab(dot)ntt(dot)co(dot)jp>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Robert Haas" <robertmhaas(at)gmail(dot)com>, "Hitoshi Harada" <umi(dot)tanuki(at)gmail(dot)com>, "Martijn van Oosterhout" <kleptog(at)svana(dot)org>, "PostgreSQL-development" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: pgsql_fdw, FDW for PostgreSQL server |
| Date: | 2012-02-17 12:08:47 |
| Message-ID: | D960CB61B694CF459DCFB4B0128514C2077EC498@exadv11.host.magwien.gv.at |
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| Lists: | pgsql-hackers |
Shigeru Hanada wrote:
>> - Since a rescan is done by rewinding the cursor, is it necessary
>> to have any other remote isolation level than READ COMMITED?
>> There is only one query issued per transaction.
>
> If multiple foreign tables on a foreign server is used in a local
query,
> multiple queries are executed in a remote transaction. So IMO
isolation
> levels are useful even if remote query is executed only once.
Oh, I see. You are right.
Yours,
Laurenz Albe
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