This article explains how MySQL's offline_mode variable and the pt‑kill tool can be used by DBAs to place a server in maintenance mode, instantly dropping non‑privileged client connections, preventing new ones, and providing a safe way to perform maintenance or backups.
This guide explains what pt‑kill is, how it works within Percona Toolkit to kill MySQL connections based on execution time and various filters, demonstrates command‑line usage, victim‑selection modes, filtering options, source‑code logic, and common patterns such as logging and daemonizing.
This article explains the limitations of MySQL's max_execution_time for SELECT statements inside stored procedures and provides practical solutions—including external kill scripts and the Percona Toolkit's pt‑kill—to enforce query timeouts while warning against use in production environments.
This guide introduces a PHP‑based reimplementation of Percona’s PT‑kill tool that not only terminates long‑running MySQL queries but also adds email and WeChat notifications, explains installation prerequisites, detailed command‑line options, example usages, configuration steps, and how to customize alerts and logging.
