Respuesta :
Variables are used to store values at runtime. When a programme finishes executing (for example, when you close an app), all data stored in variables is lost. A database, on the other hand, is used for more permanent data storage; data that remains after the program has completed its execution (e.g. user data).
In MySQL, where are system variables stored?
- In the mysqld-auto configuration. The names and values of sensitive system variables are encrypted in the cnf option file, along with a generated file key to decrypt them.
- The generated file key is then encrypted with a master key (persisted variables key) kept in a keyring. Each system variable has a default value. System variables can be set at server startup using command-line options or option files.
- The majority of them can be changed dynamically at runtime using the SET statement, allowing you to change the server's operation without having to stop and restart it.
- A global status variable can represent either the status of a specific aspect of the server (for example, Aborted connects) or the aggregated status of all connections to MySQL (for example, Bytes received and Bytes sent). If a variable does not have a global value, the session value is shown.
To learn more about system variables refer to:
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