Displaying cache information

Use this task to monitor the activity of the dynamic cache service.

About this task

The dynamic cache monitor is an installable web application that displays simple cache statistics, cache entries, and cache policy information for servlet cache instances.


  1. Use the administrative console to install the cache monitor application from the app_server_root/installableApps directory. The name of the application is CacheMonitor.ear.
    For more information about installing applications, refer to the Installing application files with the console topic. Install the cache monitor onto the application server that you want to monitor.

    [AIX Solaris HP-UX Linux Windows]Access the cache monitor on the application port, which uses 9080 as its default port number.

  2. Configure the web container transport chain and host alias for the server with cache monitor installed.
    1. Add a host alias for the port your server is using.
      Click Environment > Virtual hosts > host_type > Host aliases and create a new Host name and Port to add to the list. Creating a host alias enables you to access the cache monitor using http://your_host_name:your_port_number/cachemonitor
    Tip: You can find the port number in the SystemOut.log file. Look for message TCPC0001I or SRVE0171I.
    Note: This topic references one or more of the application server log files. As a recommended alternative, you can configure the server to use the High Performance Extensible Logging (HPEL) log and trace infrastructure instead of using SystemOut.log , SystemErr.log, trace.log, and activity.log files on distributed and IBM® i systems. You can also use HPEL in conjunction with your native z/OS® logging facilities. If you are using HPEL, you can access all of your log and trace information using the LogViewer command-line tool from your server profile bin directory. See the information about using HPEL to troubleshoot applications for more information on using HPEL.
  3. Access the cache monitor using a web browser and the URL http://your host_name:your port_number/cachemonitor, where your port_number is the port associated with the host on which you installed the cache monitor application.
  4. Verify the list of cache instances that are shown. For each cache instance, you can perform the following actions:
    Tip: You must select the servlet cache instance that you want to monitor. If you do not use servlet cache instances by using <cache-instance> tags in your cachespec.xml file, all the content is in the baseCache instance.
    • View the Statistics page and verify the cache configuration and cache data. Click Reset Statistics to reset the counters.
    • View the Cache Policies page to see which cache policies are currently loaded in the dynamic cache. Click a template to view the cache ID rules for the template.
    • View the Cache Contents page to examine the contents that are currently cached in memory.
    • View the Edge Statistics page to view data about the current ESI processors configured for caching. Click Refresh Statistics to see the latest statistics or content from the ESI processors. Click Reset Statistics to reset the counters.
    • View the Disk Offload page to view the disk configuration, statistics, and the content that is currently off-loaded from memory to disk.
    When you are viewing contents on memory or disk, click a template to view all entries for that template, click a dependency ID to view all entries for the ID, or click the cache ID to view all the data that is cached for that entry.
  5. Use the cache monitor to perform basic operations on data in a cache instance.
    Remove an entry from cache
    Click Invalidate when viewing a cache entry.
    Remove all entries for a certain dependency ID
    Click Invalidate when viewing entries for a dependency ID.
    Remove all entries for a certain template
    Click Invalidate when viewing entries for a template.
    Move an entry to the front of the Least Recently Used queue to avoid eviction
    Click Refresh when viewing a cache entry.
    Move an entry from disk to cache
    Click Send to Memory when viewing a cache entry on disk.
    Clear the entire contents of the cache
    Click Clear Cache while viewing statistics or contents.
    Clear the contents on the ESI processors
    Click Clear Cache while viewing ESI statistics or contents.
    Clear the contents of the disk cache
    Click Clear Disk while viewing disk contents.