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Log low memory conditions

Before you begin

You can automatically log low memory conditions observed by the server. WebLogic Server detects low memory by sampling the available free memory a set number of times during a time interval. At the end of each interval, an average of the free memory is recorded and compared to the average obtained at the next interval. If the average drops by a user-configured amount after any sample interval, the server logs a low memory warning message in the log file and sets the server health state to “warning.”

To log low memory conditions:

  1. If you have not already done so, in the Change Center of the Administration Console, click Lock & Edit (see Use the Change Center).
  2. In the left pane of the console, expand Environment > Servers.
  3. On the Summary of Servers page, select the server instance for which you will configure log low memory conditions.
  4. On the Configuration > Tuning tab, update as necessary:
    1. Low Memory GCThreshold -- Threshold at which the server instance logs a low memory warning and changes the health state to warning.
    2. Low Memory Sample Size -- Number of times the server instance samples free memory during the Low Memory Time Interval.
    3. Low Memory Time Interval -- Amount of time, in seconds, that defines the interval over which the server instance determines average free memory values.

    For more information about low memory detection properties, see Configuration Options.

  5. Click Save.
  6. To activate these changes, in the Change Center of the Administration Console, click Activate Changes.
    Not all changes take effect immediately—some require a restart (see Use the Change Center).

After you finish

You must reboot the server to use the new low memory condition values.


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