Description: A system variable in the context of databases is a key element that stores a value that can influence the behavior and operation of the database server. These variables allow administrators and developers to adjust system settings to optimize performance, security, and functionality of the database. System variables can encompass a wide range of configurations, from connection parameters to resource limits, and their value can be static or dynamic, depending on the operational environment’s needs. For example, a variable may define the maximum number of allowed simultaneous connections, which is crucial for handling workload on a database server. Additionally, these variables can be queried and modified in real-time, providing flexibility and control over the execution environment. In summary, system variables are fundamental for the efficient management of databases, allowing customization and optimization of server performance according to the specific needs of applications or users.
