# derby.locks.deadlockTrace

#### Function

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
Related reference
derby.authentication.builtin.algorithm
derby.authentication.ldap.searchAuthDN
derby.authentication.ldap.searchAuthPW
derby.authentication.ldap.searchBase
derby.authentication.ldap.searchFilter
derby.authentication.provider
derby.authentication.server
derby.connection.requireAuthentication
derby.database.defaultConnectionMode
derby.database.forceDatabaseLock
derby.database.fullAccessUsers
derby.database.noAutoBoot
derby.database.propertiesOnly
derby.database.readOnlyAccessUsers
derby.database.sqlAuthorization
derby.infolog.append
derby.jdbc.xaTransactionTimeout
derby.language.logQueryPlan
derby.language.logStatementText
derby.locks.deadlockTimeout
derby.locks.escalationThreshold
derby.locks.monitor
derby.locks.waitTimeout
derby.replication.logBufferSize
derby.replication.maxLogShippingInterval
derby.replication.minLogShippingInterval
derby.replication.verbose
derby.storage.initialPages
derby.storage.minimumRecordSize
derby.storage.pageCacheSize
derby.storage.pageReservedSpace
derby.storage.pageSize
derby.storage.rowLocking
derby.storage.tempDirectory
derby.stream.error.field
derby.stream.error.file
derby.stream.error.method
derby.stream.error.logSeverityLevel
derby.system.bootAll
derby.system.durability
derby.system.home
derby.user.UserName