# derby.locks.deadlockTrace

The derby.locks.deadlockTrace property causes a detailed list of locks at the time of a deadlock or a timeout to be written to the error log (typically the file derby.log).

For a deadlock, Derby describes the cycle of locks which caused the deadlock. For a timeout, Derby prints the entire lock list at the time of the timeout. This property is meaningful only if the derby.locks.monitor property is set to true.

Note: This level of debugging is intrusive: it can alter the timing of the application, reduce performance severely, and produce a large error log file. It should be used with care.

## Default

False.

## Example

    -- system property
    derby.locks.deadlockTrace=true

    CALL SYSCS_UTIL.SYSCS_SET_DATABASE_PROPERTY(
        'derby.locks.deadlockTrace', 'true')

## Dynamic or static

Dynamic; the change takes effect immediately. For information about dynamic changes to properties, see Dynamic and static properties.

Parent topic: Derby properties
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