PostgreSQL architecture for streaming replication

Transaction logs or Write-Ahead Logging (WAL) is replayed from the source to the dSource to ensure data synchronization between the two.

The architectural setup involves the following steps:

1. Ensure that the end-user application connecting to the PostgreSQL connector source database can perform both the read/write queries on the database.

2. Understand that the database changes are recorded as WAL segments in the PostgreSQL connector database under the directory pg_xlog or pg_wal.

3. Configure the source PostgreSQL connector server as a Standby Node.

4. Configure replication security by creating a replication user and specifying the authentication protocol.

5. Initiate a base backup on the standby environment.

6. Configure postgresql.conf file as per the source environment.

7. Start the standby server.