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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 connections.

  • 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 connections.

  • 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 procedure:

  1. Start the Oracle Network Manager GUI.

  2. In the GUI navigator pane, expand the icons Local > Profile.

  3. From the list on the right hand pane, select General.

  4. Click on the Advanced tab.

  5. Next, enter the values for the fields or options you want to set.

  6. When you are finished, choose File > Save Network Configuration to write your changes to the sqlnet.ora file.

Get the complete story:

The above text is an excerpt from "Oracle Database 10g New Features: Reference for Advanced Tuning and Administration", by Rampant TechPress.  Written by top Oracle experts, this book has a complete online code deport with ready to use scripts. 

To get the code instantly, click here:

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