Java DB

Apache Derby

Derby Server and Administration Guide

Derby Getting Started
Derby Reference Manual
Derby Developer's Guide
Derby Performance Tuning
Derby Server and Admin Guide
Derby Tools and Utilities
Derby Server and Admin Guide
-Part one: Derby Server Guide
-Derby in a multi-user environment
-Using the Network Server with preexisting Derby applications
-The Network Server and JVMs
-Installing required jar files and adding them to the classpath
-Starting the Network Server
-Shutting down the Network Server
-Obtaining system information
-Accessing the Network Server by using the network client driver
-Accessing the Network Server by using a DataSource object
-XA and the Network Server
-Using the Derby tools with the Network Server
-Differences between running Derby in embedded mode and using the Network Server
-Setting port numbers
-Managing the Derby Network Server
-Managing the Derby Network Server remotely by using the servlet interface
-Derby Network Server advanced topics
-Derby Network Server sample programs
-Part two: Derby Administration Guide
-Checking database consistency
-Backing up and restoring databases
-Replicating databases
-Logging on a separate device
-Obtaining locking information
-Reclaiming unused space

 

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.

 

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