Updating remote server
This connection is kept and re-used for subsequent queries in the same session.However, if multiple user identities (user mappings) are used to access the foreign server, a connection is established for each user mapping.Use of this option primarily allows the error to be thrown locally without querying the remote server.
You might increase or decrease this number to reflect higher or lower network delay to the remote server. This local estimation is unlikely to be very accurate unless local copies of the remote table's statistics are available.
Importing behavior can be customized with the following options (given in the .
You might need to turn this off if the remote server has a different set of collation names than the local server does, which is likely to be the case if it's running on a different operating system.
constraints on foreign tables, there is no provision for importing them automatically, because of the risk that a constraint expression could evaluate differently on the local and remote servers.
Any such inconsistency in the behavior of a establishes a connection to a foreign server during the first query that uses a foreign table associated with the foreign server.