# derby.language.logQueryPlan

#### Function

When this property is set to true, Derby writes the query plan information into the `derby.log` file for all executed queries. This information can help you debug problems within a system.

#### Example

    derby.language.logQueryPlan=true

#### Default

False.

#### Dynamic or static

This property is static; if you change it while Derby is running, the change does not take effect until you reboot.

Parent topic: Derby properties
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