postgres_fdw | Supabase 日本語

The extension enables Postgres to query tables and views on a remote Postgres server.

Enable the extension

Dashboard

SQL

Go to the Database page in the Dashboard.
Click on Extensions in the sidebar.
Search for "postgres_fdw" and enable the extension.

-- Example: enable the "postgres_fdw" extension
create extension if not exists postgres_fdw;

-- Example: disable the "postgres_fdw" extension
drop extension if exists postgres_fdw;

Procedural languages are automatically installed within pg_catalog, so you don't need to specify a schema.

Create a connection to another database

Create a foreign server

Define the remote database address

    create server "<foreign_server_name>"
    foreign data wrapper postgres_fdw
    options (
        host '<host>',
        port '<port>',
        dbname '<dbname>'
    );

Create a server mapping

Set the user credentials for the remote server

create user mapping for "<dbname>"
server "<foreign_server_name>"
options (
    user '<db_user>',
    password '<password>'
);

Import tables

Import tables from the foreign database

Example: Import all tables from a schema

import foreign schema "<foreign_schema>"
from server "<foreign_server>"
into "<host_schema>";

Example: Import specific tables

import foreign schema "<foreign_schema>"
limit to (
    "<table_name1>",
    "<table_name2>"
)
from server "<foreign_server>"
into "<host_schema>";

Query foreign table
```
select * from "<foreign_table>"
```

Configuring execution options

Fetch_size

Maximum rows fetched per operation. For example, fetching 200 rows with fetch_size set to 100 requires 2 requests.

alter server "<foreign_server_name>"
options (fetch_size '10000');

Batch_size

Maximum rows inserted per cycle. For example, inserting 200 rows with batch_size set to 100 requires 2 requests.

alter server "<foreign_server_name>"
options (batch_size '1000');

Extensions

Lists shared extensions. Without them, queries involving unlisted extension functions or operators may fail or omit references.

alter server "<foreign_server_name>"
options (extensions 'vector, postgis');

For more server options, check the extension's official documentation

Resources

Official postgres_fdw documentation