We share common IT technologies (Java, Web, SQL, etc.) and practical applications of emerging software development techniques. New articles are posted daily. Follow IT Xianyu to stay ahead in tech. The IT Xianyu series is being regularly updated.
This tutorial walks you through preparing your environment, configuring DataGrip, and executing SQL scripts to connect and manage both MySQL and PostgreSQL databases, complete with hardware requirements, connection parameters, sample code, troubleshooting tips, and performance optimization advice.
This tutorial demonstrates how to use variables and loop constructs in MySQL and PostgreSQL stored procedures to iterate over a users table, filter records by age, and simulate sending a system welcome message, while comparing syntax differences between the two databases.
This tutorial explains why stored procedure parameters are essential, details the differences between IN, OUT, and INOUT parameters, and provides step‑by‑step MySQL examples—including environment setup, code snippets, execution results, common FAQs, and an advanced age‑checking exercise—to help developers write flexible, reusable procedures.
Learn how to create, execute, and troubleshoot a simple MySQL stored procedure using MySQL 8.0, covering delimiter changes, basic SQL syntax, result verification, common beginner mistakes, and extending the concept with parameterized examples.
This guide walks you through identifying MySQL bottlenecks, using EXPLAIN, optimizing indexes, rewriting queries, tuning configuration, applying architectural patterns, and learning from real‑world cases to dramatically speed up your database.
This guide explains what the MySQL slow query log is, why it matters for performance, how to check its status, enable it temporarily or permanently in Docker‑based deployments, troubleshoot command‑not‑found errors, read the log file, and filter entries to focus on the truly slow queries.
Learn step‑by‑step how to troubleshoot MySQL master‑slave replication problems, from verifying component roles and executing the correct SHOW SLAVE STATUS command inside the MySQL client, to fixing missing command errors, checking IO/SQL threads, and restarting replication in Docker‑based environments.
This guide walks you through preparing three AlmaLinux servers, disabling firewalls and SELinux, installing Containerd as the CRI, adding Kubernetes repositories, installing kubeadm, kubelet and kubectl, configuring the runtime, and verifying each component so you can confidently bootstrap a production‑ready Kubernetes cluster.
Learn how to quickly pinpoint MySQL performance bottlenecks on AlmaLinux by using built‑in tools like top, iotop, ss, and netstat, and automate snapshot collection with a simple Bash script that records system and container metrics for later analysis.
This article provides a step‑by‑step tutorial for DBAs to design a reliable MySQL backup strategy, write a Bash automation script, schedule it with cron, and perform restoration drills using Docker containers, while covering directory planning, command checks, cleanup, and common troubleshooting.
