# derby.locks.deadlockTimeout

#### Function

Determines the number of seconds after which Derby checks whether a transaction waiting to obtain a lock is involved in a deadlock. If a deadlock has occurred, and Derby chooses the transaction as a deadlock victim, Derby aborts the transaction. The transaction receives an SQLException of SQLState 40001. If the transaction is not chosen as the victim, it continues to wait for a lock if derby.locks.waitTimeout is set to a higher value than the value of derby.locks.deadlockTimeout.

If this property is set to a higher value than derby.locks.waitTimeout, no deadlock checking occurs. See derby.locks.waitTimeout.

For more information about deadlock checking, see "Deadlocks" in Chapter 5 of the Java DB Developer's Guide.

#### Default

20 seconds.

#### Example

    derby.locks.deadlockTimeout=30
    -- database-wide property
    CALL SYSCS_UTIL.SYSCS_SET_DATABASE_PROPERTY(
        'derby.locks.deadlockTimeout', '30')

#### Dynamic or static

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

Parent topic: Derby properties
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