CREATE SERVER

Function

CREATE SERVER defines a new foreign server.

Syntax

CREATE SERVER server_name
    FOREIGN DATA WRAPPER fdw_name
    OPTIONS ( { option_name ' value ' } [, ...] ) ;

Parameter Description

• server_name

  Specifies the server name.

  Value range: a string containing no more than 63 characters

• fdw_name

  Specifies the name of the foreign data wrapper.

  Value range: oracle_fdw, mysql_fdw, postgres_fdw, mot_fdw

• OPTIONS ( { option_name ' value ' } [, …] )

  Specifies options for the server. These options typically define the connection details of the server, but the actual names and values depend on the foreign data wrapper of the server.

  • Options supported by oracle_fdw are as follows:

    • dbserver

      Connection string of the remote Oracle database.

    • isolation_level (default value: serializable)

      Oracle database transaction isolation level.

      Value range: serializable, read_committed, read_only

  • Options supported by mysql_fdw are as follows:

    • host (default value: 127.0.0.1)

      IP address of the MySQL server or MariaDB.

    • port (default value: 3306)

      Listening port number of the MySQL server or MariaDB.

  • The options supported by postgres_fdw are the same as those supported by libpq. For details, see Connection Character Strings. Note that the following options cannot be set:

    • user and password

      The user name and password are specified when the user mapping is created.

    • client_encoding

      The encoding mode of the local server is automatically obtained and set.

    • application_name

      This option is always set to postgres_fdw.

In addition to the connection parameters supported by libpq, the following options are provided:

• use_remote_estimate

  Controls whether postgres_fdw issues the EXPLAIN command to obtain the estimated run time. The default value is false.

• fdw_startup_cost

  Estimates the startup time required for a foreign table scan, including the time to establish a connection, analyze the request at the remote server, and generate a plan. The default value is 100.

• fdw_typle_cost

  Specifies the additional consumption when each tuple is scanned on a remote server. The value specifies the extra consumption of data transmission between servers. The default value is 0.01.