Neon Postgres source setup guide

Set up Neon Postgres instance as a source for ClickPipes

This is a guide on how to setup Neon Postgres, which you can use for replication in ClickPipes. Make sure you’re signed in to your Neon console for this setup.

Creating a user with permissions

Connect to your Neon instance as an admin user and execute the following commands:

1. Create a dedicated user for ClickPipes:

   CREATE USER clickpipes_user PASSWORD 'some-password';
   

2. Grant schema-level, read-only access to the user you created in the previous step. The following example shows permissions for the public schema. Repeat these commands for each schema containing tables you want to replicate:

   GRANT USAGE ON SCHEMA "public" TO clickpipes_user;
   GRANT SELECT ON ALL TABLES IN SCHEMA "public" TO clickpipes_user;
   ALTER DEFAULT PRIVILEGES IN SCHEMA "public" GRANT SELECT ON TABLES TO clickpipes_user;
   

3. Grant replication privileges to the user:

   ALTER USER clickpipes_user WITH REPLICATION;
   

4. Create a publication with the tables you want to replicate. We strongly recommend only including the tables you need in the publication to avoid performance overhead.

Any table included in the publication must either have a primary key defined or have its replica identity configured to FULL. See the Postgres FAQs for guidance on scoping.

• To create a publication for specific tables:

  CREATE PUBLICATION clickpipes FOR TABLE table_to_replicate, table_to_replicate2;
  

• To create a publication for all tables in a specific schema:

  CREATE PUBLICATION clickpipes FOR TABLES IN SCHEMA "public";
  

The clickpipes publication will contain the set of change events generated from the specified tables, and will later be used to ingest the replication stream.

Enable logical replication

In Neon, you can enable logical replication through the UI. This is necessary for ClickPipes’s CDC to replicate data. Head over to the Settings tab and then to the Logical Replication section.

Click on Enable to be all set here. You should see the below success message once you enable it.

Let’s verify the below settings in your Neon Postgres instance:

SHOW wal_level; -- should be logical
SHOW max_wal_senders; -- should be 10
SHOW max_replication_slots; -- should be 10

IP whitelisting (for Neon enterprise plan)

If you have Neon Enterprise plan, you can whitelist the ClickPipes IPs to allow replication from ClickPipes to your Neon Postgres instance. To do this you can click on the Settings tab and go to the IP Allow section.

Copy connection details

Now that we have the user, publication ready and replication enabled, we can copy the connection details to create a new ClickPipe. Head over to the Dashboard and at the text box where it shows the connection string, change the view to Parameters Only. We will need these parameters for our next step.

What’s next?

You can now create your ClickPipe and start ingesting data from your Postgres instance into ClickHouse Cloud. Make sure to note down the connection details you used while setting up your Postgres instance as you will need them during the ClickPipe creation process.