<< Using the NetworkServerControl API | derby.drda.minThreads property >>

derby.drda.keepAlive property

<< Using the NetworkServerControl API | derby.drda.minThreads property >>

Derby Server and Administration Guide

Properties in the command line or in the

.bat

.ksh

files take precedence over the

properties in the

derby.properties

file. Arguments included on commands that are

issued on the command line take precedence over property values.

derby.drda.host property

Causes the Network Server to listen on a specific network interface. This property allows
multiple instances of Network Server to run on a single machine, each using its own
unique host:port combination. The host needs to be set to enable remote connections. By
default, the Network Server will listen only on the loopback address. If the property is set
to 0.0.0.0, Network Server will listen on all interfaces. Ensure that you are running under
the security manager and that user authorization is enabled before you enable remote
connections with this property.

Syntax

derby.drda.host=hostname

Default

If no host name is specified, the Network Server listens on the loopback address of the
current machine (localhost).

Example

derby.drda.host=myhost

Static or dynamic

Static. You must restart the Network Server for changes to take effect.

derby.drda.keepAlive property

Indicates whether SO_KEEPALIVE is enabled on sockets. The keepAlive mechanism
is used to detect when clients disconnect unexpectedly. A keepalive probe is sent to
the client if a long time (by default, more than two hours) passes with no other data
being sent or received. The derby.drda.keepAlive property is used to detect and clean
up connections for clients on powered-off machines or clients that have disconnected
unexpectedly.

If the property is set to false, Derby will not attempt to clean up disconnected clients.
The keepAlive mechanism might be disabled if clients need to resume work without
reconnecting even after being disconnected from the network for some time. To disable
keepAlive probes on Network Server connections, set this property to false.

Syntax

derby.drda.keepAlive=[true|false]

Default

True.

Example

derby.drdra.keepAlive=false

Static or dynamic

Static. You must restart the Network Server for changes to take effect.

derby.drda.logConnections property

Indicates whether to log connections. Also controls the logging of the connection number.
Connection number tracing, if enabled, goes to both the

derby.log

file and the network

server console.