Trigger-Based Replication

Trigger-based replication is a method of replication in PostgreSQL where a trigger function is used to replicate changes made to the data in a table. In this method, whenever an INSERT, UPDATE, or DELETE operation is performed on the data in the table, a trigger function is automatically executed, and the changes are replicated to the other tables or databases.

Why use trigger-based replication?

Trigger-based replication is a simple and flexible method of replication as it allows the replication of changes to be performed at the row level. This makes it easy to keep track of changes made to the data, and it’s also possible to replicate specific changes only.

Setting up trigger-based replication

To set up trigger-based replication in PostgreSQL, follow these steps:

Create a replica table

First, we need to create a replica table that will store the replicated data. The replica table should have the same structure as the original table. The following is an example of a replica table that’s used to store the replicated data from the Employee table: