Welcome on My New Hugo Project

Getting Started with RAG

Wed, 19 Aug 2026 09:00:00 +0800

Why RAG
#

LLM knowledge has a cutoff date and can’t cover private documents. Retrieval-augmented generation (RAG) first retrieves relevant content from a knowledge base, then has the model answer based on it — sharply reducing hallucinations.

Prompt Engineering in Practice

Tue, 18 Aug 2026 09:00:00 +0800

What is prompt engineering
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A prompt is the interface to a large language model. Prompt engineering designs that input so the model reliably produces high-quality output.

AI Technology Overview

Mon, 17 Aug 2026 10:00:00 +0800

Machine learning and deep learning
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Machine learning lets programs learn patterns from data automatically; deep learning uses multi-layer neural networks to excel at vision, speech, and text tasks.

Managing Cloud Resources with Terraform

Mon, 17 Aug 2026 09:00:00 +0800

Why IaC
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Clicking through consoles is hard to reuse and audit. Infrastructure as code (IaC) describes resources in code, making changes reviewable and reversible.

Cloud Computing Basics

Sun, 16 Aug 2026 10:00:00 +0800

Three cloud service models
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IaaS (Infrastructure as a Service): VMs, storage, and networking, e.g. AWS EC2
PaaS (Platform as a Service): runtimes and middleware, e.g. Heroku
SaaS (Software as a Service): ready-to-use applications, e.g. Gmail

Containers and Kubernetes
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Containers (e.g. Docker) package an app with its dependencies for environment consistency; Kubernetes handles orchestration, scaling, and self-healing.

Docker Containerization Basics

Sun, 16 Aug 2026 09:00:00 +0800

The problem containers solve
#

“It works on my machine” — environment drift is an ops nightmare. Containers package the app with its runtime into an image that runs anywhere.

Getting Started with PostgreSQL

Sat, 15 Aug 2026 10:00:00 +0800

What is PostgreSQL
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PostgreSQL is a powerful open-source relational database known for its reliability and extensibility, supporting rich data types, full-text search, JSON, and geospatial processing.

SQL Query Performance Tuning

Sat, 15 Aug 2026 09:00:00 +0800

Finding slow queries
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Enable the slow-query log: log_min_duration_statement
Analyze plans with EXPLAIN ANALYZE
Watch pg_stat_statements for the most frequent SQL

Common performance killers
#

Full table scans: missing indexes or conditions that can’t use them
Implicit type casts: functions on indexed columns disable the index
N+1 queries: querying row-by-row inside a loop
Large-offset pagination: OFFSET 1000000 gets slower as you page

Fixes
#

Rewrite SQL: drive big tables with small result sets (join order)
Use indexes wisely: covering and composite indexes
Denormalize judiciously: precomputed summary tables

Summary
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SQL tuning is about understanding the execution plan. Locate the bottleneck first, then fix it — don’t blindly add indexes.

Hugo Quickstart Guide

Fri, 14 Aug 2026 18:00:00 +0800

Hugo is one of the most popular open-source static site generators, known for its speed and simple deployment. This guide walks you through building and publishing your first Hugo site.

My First Post

Fri, 14 Aug 2026 17:55:41 +0800

Introduction
#

This is bold text and this is italic text.

Visit the Hugo website!

Database Backup and Recovery Guide

Fri, 14 Aug 2026 09:00:00 +0800

Why backups matter
#

Data is the core asset of any system. Hardware failure, human error, ransomware — any incident can cause irrecoverable loss. Data without a backup is not data.

PostgreSQL Index Tuning in Practice

Thu, 13 Aug 2026 09:00:00 +0800

Why indexes matter
#

Without an index, table scans are O(n) — queries degrade quickly as data grows. A good index brings lookups down to O(log n).

Static Site Generators Compared

Wed, 12 Aug 2026 09:00:00 +0800

Why SSGs
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Static site generators (SSGs) compile Markdown and other content into plain HTML, offering speed, security, and simple deployment.

Markdown Writing Tips

Tue, 11 Aug 2026 09:00:00 +0800

Why Markdown
#

Markdown is concise and focuses on content — the de facto standard for technical writing. Combined with a static site generator, publishing is free and instant.

Going Live: From Zero to Deployment

Mon, 10 Aug 2026 09:00:00 +0800

Why
#

I always wanted my own blog to collect notes and insights. After comparing options, I settled on Hugo + Blowfish: fast builds, a beautiful theme, and built-in multilingual support.

Tech Year in Review 2025

Sun, 28 Dec 2025 10:00:00 +0800

LLMs move from demo to production
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In 2025, large language models left the “toy” stage and entered real business scenarios: code completion, customer support, and document processing. RAG and agents became the mainstream pattern for enterprise adoption, while inference costs kept falling.

About

Mon, 01 Jan 0001 00:00:00 +0000

About this site
#

This is a personal blog built with the Hugo static site generator and the Blowfish theme, modeled after the bilingual structure of vonng.com/pigsty: Chinese by default, an English version under /en/, and posts grouped by year.

Welcome on My New Hugo Project

Getting Started with RAG

Why RAG #

Prompt Engineering in Practice

What is prompt engineering #

AI Technology Overview

Machine learning and deep learning #

Managing Cloud Resources with Terraform

Why IaC #

Cloud Computing Basics

Three cloud service models #

Containers and Kubernetes #

Docker Containerization Basics

The problem containers solve #