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Re: pgsql_fdw, FDW for PostgreSQL server

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 (view raw or flat)
Thread:
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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