https://nryanov.com/tags/logical-replication/Recent content in Logical-Replication on Nikita RyanovHugoen-usFri, 10 May 2024 04:30:00 +0300https://nryanov.com/postgresql/debezium-postgres/Fri, 10 May 2024 04:30:00 +0300https://nryanov.com/postgresql/debezium-postgres/<p>In this little article I&rsquo;ll show different ways to set up debezium for log-based CDC. Before diving into details about debezium, I&rsquo;ll shortly describe CDC and why it may be helpful in some tasks.</p> <h1 id="cdc-change-data-capture">CDC: Change Data Capture <!-- raw HTML omitted --><!-- raw HTML omitted --></h1> <p>In the Internet the <code>CDC</code> is described as a design pattern which allows to track data changes (deltas). Let&rsquo;s consider this approach on table <code>user_balances</code>. Initial state of table is:</p>https://nryanov.com/postgresql/postgresql-logical-replication/Fri, 04 Feb 2022 22:50:00 +0300https://nryanov.com/postgresql/postgresql-logical-replication/<h1 id="prerequisite">Prerequisite <!-- raw HTML omitted --><!-- raw HTML omitted --></h1> <p>All examples assume that postgresql is already installed on your machine. Also, all examples are created using <code>PostgreSQL 14.1 on aarch64-apple-darwin20.6.0, compiled by Apple clang version 13.0.0 (clang-1300.0.29.3), 64-bit</code>.</p> <h1 id="logical-replication">Logical replication <!-- raw HTML omitted --><!-- raw HTML omitted --></h1> <p>Logical replication is another method to replicate data between multiple nodes. This replication uses publish-subscribe model. Each publisher may have multiple subscribers and each subscriber can subscribe to multiple publisher. Also, each subscriber may be a publisher for another node which make it possible to create a cascading replication.</p>