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| -rw-r--r-- | doc/src/sgml/postgres-fdw.sgml | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/doc/src/sgml/postgres-fdw.sgml b/doc/src/sgml/postgres-fdw.sgml index 839126c4efe..fb87372bde1 100644 --- a/doc/src/sgml/postgres-fdw.sgml +++ b/doc/src/sgml/postgres-fdw.sgml @@ -401,6 +401,16 @@ OPTIONS (ADD password_required 'false'); A table-level option overrides a server-level option. The default is <literal>false</literal>. </para> + + <para> + In order to ensure that the data being returned from a foreign server + is consistent, <filename>postgres_fdw</filename> will only open one + connection for a given foreign server and will run all queries against + that server sequentially even if there are multiple foreign tables + involved, unless those tables are subject to different user mappings. + In such a case, it may be more performant to disable this option to + eliminate the overhead associated with running queries asynchronously. + </para> </listitem> </varlistentry> |