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ALTER SERVER

Updated on 2024-05-07 GMT+08:00

Description

Adds, modifies, or deletes the parameters of an existing server. You can query existing servers from the pg_foreign_server system catalog.

Precautions

  • Only the server owner or a user granted with the ALTER permission can run the ALTER SERVER command. By default, system administrators have the permission. To modify a server owner, you must be the server owner or system administrator and a member of the new owner role.
  • When multi-layer quotation marks are used for sensitive columns (such as password and secret_access_key) in OPTIONS, the semantics is different from that in the scenario where quotation marks are not used. Therefore, sensitive columns are not identified for anonymization.

Syntax

  • Change the parameters for a foreign server.
     ALTER SERVER server_name [ VERSION 'new_version' ]   
          [ OPTIONS ( {[ ADD | SET | DROP ] option ['value']} [, ... ] ) ];

    In OPTIONS, ADD, SET, and DROP are operations to be performed. If these operations are not specified, ADD operations will be performed by default. option and value are the parameters of the corresponding operation.

  • Change the owner of a foreign server.
    1
    2
    ALTER SERVER server_name 
        OWNER TO new_owner;
    
  • Change the name of a foreign server.

    ALTER SERVER server_name     
       RENAME TO new_name;

Parameters

  • server_name

    Specifies the name of the server to be modified.

  • new_version

    Specifies the new version of the server.

  • OPTIONS

    Change options of the server. ADD, SET, and DROP are operations to be performed. If the operation is not set explicitly, ADD is used. The option name must be unique, and the name and value are also validated with the foreign data wrapper library of the server.

    In addition to the connection parameters supported by libpq, the following parameters are provided:
    • 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. The value is a real number greater than 0.

    • 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. The value is a real number greater than 0.

  • new_name

    Specifies the new name of the server.

Examples

-- Create my_server.
gaussdb=# CREATE SERVER my_server FOREIGN DATA WRAPPER log_fdw;
 
-- Change the name of an external service.
gaussdb=# ALTER SERVER my_server 
    RENAME TO my_server_1;
 
-- Delete my_server_1.
gaussdb=# DROP SERVER my_server_1;

Helpful Links

CREATE SERVER and DROP SERVER

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