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David Cao

David is a Cloud & DevOps Enthusiast. He has years of experience as a Linux engineer. He had working experience in AMD, EMC. He likes Linux, Python, bash, and more. He is a technical blogger and a Software Engineer. He enjoys sharing his learning and contributing to open-source.

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 …

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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, …

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In today’s world of game development, creating an interactive and engaging game has never been easier, thanks to AI-powered tools like Claude. As an AI language model, Claude can assist you in various aspects of game development, from brainstorming ideas to writing the actual game code. In this article, I will walk you through how …

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Introducing Gemini Live, the latest feature in the Gemini app that brings a more natural and interactive way to have voice-based conversations with Gemini. Whether you’re brainstorming creative ideas, preparing for an important presentation, or just exploring new topics, Gemini Live offers real-time, spoken responses, transforming the way you interact with AI. Available now on …

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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 …

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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, …

Read More about Understanding PostgreSQL’s REPLICA IDENTITY FULL for Logical Replication

As artificial intelligence (AI) continues to evolve, one of the most groundbreaking advancements in natural language processing (NLP) has been the development of ChatGPT by OpenAI. This AI model, based on the GPT (Generative Pre-trained Transformer) architecture, has become a popular tool for a wide range of applications—from casual conversation to complex problem-solving. However, as …

Read More about How Accurate is ChatGPT? A Comprehensive Analysis

In recent years, AI-powered tools have revolutionized the world of content creation. One of the most exciting and versatile technologies in this space is ChatGPT, developed by OpenAI. Leveraging advanced natural language processing (NLP), ChatGPT can generate human-like text based on a wide range of inputs. Whether you are a content writer, marketer, or business …

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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 …

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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 …

Read More about How to Manage WAL Files in PostgreSQL: Switching WAL Files and Finding the Current One