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SQL Anywhere 11.0.1 » SQL Anywhere Server - Database Administration » Starting and Connecting to Your Database » Connection parameters and network protocol options » Connection parameters


LivenessTimeout connection parameter [LTO]

Controls the shutdown of connections when they are no longer intact.


Network server only.

All platforms except non-threaded Unix applications.


Integer, in seconds



If no LivenessTimeout value is set, the LivenessTimeout is controlled by the setting on the server, which defaults to 120 seconds.


A liveness packet is sent periodically across a client/server TCP/IP communication protocol to confirm that a connection is intact. If the client runs for the LivenessTimeout period without detecting a liveness request or response packet, the communication is ended.

Liveness packets are sent when a connection has not sent any packets for between one third and two thirds of the LivenessTimeout value.

When there are more than 200 connections to a server, the server automatically calculates a higher LivenessTimeout value based on the stated LivenessTimeout value. This enables the server to handle a large number of connections more efficiently.

Alternatively, you can set this parameter by entering its value in the LivenessTimeout text box on the Network tab of the ODBC Configuration For SQL Anywhere 11 window.

The minimum value for the LivenessTimeout connection parameter is 30 seconds, and the maximum value is 32767 seconds. If you specify 0, liveness timeout checking is turned off for the connection. Any non-zero value less than the minimum value is reset to the minimum value. For example, a connection string containing "LivenessTimeout=5" uses "LivenessTimeout=30".

See also

The following connection string fragment sets a LivenessTimeout value of 10 minutes: