||Oracle Tips by Burleson
Oracle 10g Improved Network Outage Detection
sqlnet.expire_time – This parameter is
used to set a time interval, in minutes, to determine how often a
probe should be sent verifying that client/server connections are
active. If you need to ensure that connections are not left open
indefinitely (or up to the time set by operating system-specific
parameters), you should set a value that is greater than 0. This
protects the system from connections left open due to an abnormal
client termination. When the probe detects a terminated connection
or a connection no longer in use, it signals an error, causing the
server process to exit. This setting is intended for use on the
database server side of the connection, which usually handles
multiple connections at any one time. Limitations on using this
terminated (dead) connection detection feature are:
It cannot be used on bequeathed
Although they are very small, a probe
packet will generate additional network traffic that may
downgrade the network's performance, depending on the number of
Depending on the operating system that is
in use, additional server processing may need to be performed to
distinguish the connection probe from other events that occur.
This overhead for detection of probe events can result in
downgraded network performance.
To set up these advanced features, follow this
Start the Oracle Network Manager GUI.
In the GUI navigator pane, expand the icons
Local > Profile.
From the list on the right hand pane,
Click on the Advanced tab.
Next, enter the values for the fields or
options you want to set.
When you are finished, choose File > Save
Network Configuration to write your changes to the sqlnet.ora
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