Postgresql

When working with databases, one of the most common questions you may find yourself asking is, “How many rows are in this table?” In PostgreSQL, the answer might not be as straightforward as it seems at first glance. Although the SQL command to count rows appears simple, the underlying mechanics and performance implications can be …

PostgreSQL, as one of the most advanced and widely used relational database management systems (RDBMS), offers a range of system views that can be utilized for monitoring and diagnosing database operations. These system views provide insights into the internal state of the database, such as resource usage, query performance, locks, connections, and system activity, making …

The max_wal_size parameter in PostgreSQL is a critical setting that directly impacts the Write-Ahead Log (WAL) system, influencing both write performance and recovery time. It controls the maximum amount of WAL data that can accumulate before a checkpoint is triggered, helping to manage disk I/O and recovery behavior. In this article, we’ll explore how max_wal_size …

As a Database Administrator (DBA), my role revolves around ensuring the performance, integrity, and availability of the databases I manage. This involves tasks like designing efficient schemas, troubleshooting performance issues, monitoring system health, and analyzing logs. However, managing large, complex databases can be challenging, especially as workloads increase and systems become more intricate. That’s where …

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, …