Sybase DC35823-01-1500-04 manual Adjusting the client connection timeout period

CHAPTER 3 Configuring the Operating System

Adjusting the client connection timeout period

Adaptive Server uses the KEEPALIVE option of the TCP/IP protocol to detect clients that are no longer active. When a connection to a client is inactive for a period of time (the timeout period), the operating system sends KEEPALIVE packets at regular intervals. If it does not receive a response from the client machine for any of these packets, the operating system notifies Adaptive Server that the client is no longer responding. Adaptive Server then terminates the client’s connection.

The KEEPALIVE default timeout period is 2 hours (7,200,000 ms). To display the current time value, use the command for your platform as shown in the following sections.

For HP-UX

To display the current timeout period, enter:

/usr/contrib/bin/nettune -l

Note The switch is a lowercase “L”, not the number one (1).

The tcp_keepstart parameter specifies the length of time (measured in seconds) to keep an idle connection active before the system checks to see if the connection died.

To change the timeout period, use the nettune -scommand.

For IBM RS/6000

To display the current timeout value, enter:

/usr/sbin/no -o tcp_keepidle

The tcp_keepidle parameter specifies the length of time (measured in half seconds) to keep an idle connection active before the system checks to see if the connection died. The default is 14,400 half seconds (7200 seconds, or 2 hours).

IBM recommends a value of at least 15 minutes.

Configuration Guide 41