# derby.stream.error.style

The derby.stream.error.style property specifies that the Derby log file should be rolled over when it reaches a certain size.

## Function

If you set this property to `rollingFile` (the only supported value), Derby by default creates up to 10 rolling files named derby-0.log, derby-1.log, and so on, up to derby-9.log, each with a maximum length of 1,024,000 bytes.

You can override any of these defaults by setting one or more of the following properties:

- derby.stream.error.rollingFile.count
- derby.stream.error.rollingFile.limit
- derby.stream.error.rollingFile.pattern

If you set this property, the derby.stream.error.field, derby.stream.error.file, and derby.stream.error.method properties are ignored.

This property works in accordance with the setting of the derby.infolog.append property. If derby.infolog.append is not set or is set to false, any existing log files will be rolled over and a new log file will be created when the Derby engine is started. If derby.infolog.append is set to true, the latest existing log file, if any, will be appended to.

## Syntax

    derby.stream.error.style=style

## Default

Not set.

## Example

    derby.stream.error.style=rollingFile

## Scope

system-wide

## 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
Related reference
derby.authentication.builtin.algorithm
derby.authentication.builtin.iterations
derby.authentication.builtin.saltLength
derby.authentication.ldap.searchAuthDN
derby.authentication.ldap.searchAuthPW
derby.authentication.ldap.searchBase
derby.authentication.ldap.searchFilter
derby.authentication.native.passwordLifetimeMillis
derby.authentication.native.passwordLifetimeThreshold
derby.authentication.provider
derby.authentication.server
derby.connection.requireAuthentication
derby.database.classpath
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.language.sequence.preallocator
derby.language.statementCacheSize
derby.locks.deadlockTimeout
derby.locks.deadlockTrace
derby.locks.escalationThreshold
derby.locks.monitor
derby.locks.waitTimeout
derby.replication.logBufferSize
derby.replication.maxLogShippingInterval
derby.replication.minLogShippingInterval
derby.replication.verbose
derby.storage.indexStats.auto
derby.storage.indexStats.log
derby.storage.indexStats.trace
derby.storage.initialPages
derby.storage.minimumRecordSize
derby.storage.pageCacheSize
derby.storage.pageReservedSpace
derby.storage.pageSize
derby.storage.rowLocking
derby.storage.tempDirectory
derby.storage.useDefaultFilePermissions
derby.stream.error.extendedDiagSeverityLevel
derby.stream.error.field
derby.stream.error.file
derby.stream.error.logBootTrace
derby.stream.error.logSeverityLevel
derby.stream.error.method
derby.stream.error.rollingFile.count
derby.stream.error.rollingFile.limit
derby.stream.error.rollingFile.pattern
derby.system.bootAll
derby.system.durability
derby.system.home
derby.user.UserName
DataDictionaryVersion