Description: GLOBAL variables in MySQL refer to configurations or parameters that apply to the entire database server instance. These variables allow database administrators to adjust the server’s behavior and optimize its performance according to the specific needs of the applications running on it. Unlike SESSION variables, which affect only the current user’s connection, GLOBAL variables impact all active connections and sessions. This means that any changes made to a GLOBAL variable will be reflected across all user sessions, making them powerful tools for managing server performance and security. GLOBAL variables can encompass a wide range of configurations, from memory limits and timeout settings to logging and security options. Administrators can query and modify these variables using specific SQL commands, allowing them to customize the MySQL execution environment to meet the demands of their applications and users. In summary, GLOBAL variables are essential for the effective management of a database server, providing centralized control over its behavior and performance.
