How do I set up replication slots for PostgreSQL data warehouses?

In this guide, we will set up replication slots for PostgreSQL data warehouses using Pulumi. Replication slots are a feature in PostgreSQL that ensures changes are retained in the write-ahead log (WAL) until they are consumed by all subscribers. This is essential for maintaining a consistent state across replicas in a data warehouse setup.

Key Points

• We will create a replication slot using Pulumi.
• This ensures that changes are retained in the WAL until they are consumed by all subscribers.
• The replication slot will be created using the postgresql Pulumi package.

Steps

1. Import the necessary Pulumi and PostgreSQL packages.
2. Define the PostgreSQL replication slot with the required properties.

import * as pulumi from "@pulumi/pulumi";
import * as postgresql from "@pulumi/postgresql";

// Define the PostgreSQL replication slot
const replicationSlot = new postgresql.ReplicationSlot("myReplicationSlot", {
    name: "my_replication_slot", // Name of the replication slot
    plugin: "wal2json",          // The output plugin to use for the replication slot
    database: "my_database"      // The name of the database the slot is associated with
});

// Export the name of the replication slot
export const replicationSlotName = replicationSlot.name;

Conclusion

In this example, we created a PostgreSQL replication slot using Pulumi. The replication slot ensures changes are retained in the WAL until they are consumed by all subscribers, which is crucial for maintaining consistency across replicas in a data warehouse setup. The slot is defined with a name, plugin, and associated database.