Postgresql

PostgreSQL is a powerful, open-source relational database management system (RDBMS) widely used for managing structured data. The underlying architecture of a PostgreSQL database consists of various structural objects, each playing a specific role in data storage, organization, and management. Understanding these objects and how they interact is crucial for effective database administration and application development. …

In PostgreSQL, partitioning is a technique used to manage large tables by splitting them into smaller, more manageable pieces. This helps to improve query performance, manageability, and maintenance operations. There are two main types of partitioning: vertical partitioning and horizontal partitioning. Let’s explore both concepts. 1. Horizontal Partitioning Horizontal partitioning involves dividing a table into …

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 configuration file (postgresql.conf) provides a wide range of parameters that control the behavior of the …

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 for temporary tables or joins in some cases. A subquery can return a single value, …

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 command, which is available in the psql command-line interface. This command provides a detailed view …

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 PostgreSQL tracks and identifies rows for replication, especially when handling DELETE operations. In this article, …

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 role in replication, file management, and system recovery. What is Write-Ahead Logging (WAL)? Write-Ahead Logging …

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 find the current WAL file and how to switch to a new WAL file can …

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 access to database objects like tables, views, sequences, and functions by assigning specific privileges to …

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 each other. While MVCC enhances database performance by enabling high concurrency, it also creates a …