PostgreSQL is a powerful, open-source relational database management system known for its flexibility, extensibility, and performance. One of the key factors in ensuring optimal database performance is configuring PostgreSQL correctly to match the specific needs of your workload. The PostgreSQL…
Subqueries, also known as nested queries, are queries embedded within other SQL queries. In PostgreSQL, subqueries are a powerful tool to help filter, manipulate, and aggregate data dynamically. They allow you to perform complex data retrieval operations without the need…
In PostgreSQL, managing access privileges is an essential part of database administration, especially in multi-user environments. One of the most useful commands for viewing and managing access privileges for database objects (such as tables, views, sequences, etc.) is the \dp…
In PostgreSQL, logical replication allows for selective replication of database objects like tables, allowing changes in one database to be replicated to another in real-time. One important feature in logical replication is the concept of replica identity, which defines how…
In PostgreSQL, replication mechanisms—whether physical or logical—rely heavily on the Write-Ahead Logging (WAL) system. WAL serves as a fundamental component to ensure data consistency, durability, and to support replication processes. This article explains how WAL works in PostgreSQL, including its…
In PostgreSQL, the Write-Ahead Log (WAL) is a critical part of ensuring data durability and consistency. WAL files store all changes made to the database, and they are used for replication, point-in-time recovery (PITR), and crash recovery. Understanding how to…
Introduction PostgreSQL is a robust, open-source relational database management system that offers advanced features for data storage, processing, and retrieval. One of the key components of PostgreSQL’s security model is the GRANT statement. This statement allows database administrators to control…
PostgreSQL is a powerful and widely-used open-source relational database management system (RDBMS) known for its robustness, scalability, and performance. At its core, PostgreSQL uses Multiversion Concurrency Control (MVCC), a technique that allows multiple transactions to occur simultaneously without interfering with…
Replication is a key component of database management systems (DBMS) that allows for the duplication of data across multiple systems. In PostgreSQL, replication ensures that data from one server (the primary) is mirrored to one or more other servers (the…
Logical replication is an advanced feature in PostgreSQL that allows the replication of database changes at a logical level, meaning it replicates the changes made to data rather than replicating the physical data itself. Introduced in PostgreSQL 10, logical replication…
