Note
This variable is used only for compatibility with MySQL 8.0, but its functionality is not implemented. You can query and set this variable, but the setting does not take effect even though the system does not return an error.
Description
performance_schema declares to the client whether performance queries are supported.
Attributes
| Attribute | Description |
|---|---|
| Type | Boolean |
| Default value | OFF |
| Value range |
|
| Effective scope | Global |
| Modifiable | Yes. You can use the SET statement to modify the variable. |