Cache Monitor 

Use

You can use the cache monitor to monitor the current status of all active caches in your system landscape. The data displayed in the cache monitor can be used for evaluations.

 

Features

To call up the Cache Monitor, choose System Administration ® Monitoring ® Knowledge Management ® Cache Monitor.

The active caches and details are displayed in a table.

You can use the System ID selection list to define whether the monitor is to display the cache data for a specific system or a summary of the cache data for all system in the system landscape (System Overview).

If you select a remote system or System Overview, the monitor waits up to two minutes for a response from the system. In this way, the monitor takes into account delayed responses in the event of a high load on remote systems. If systems cannot be reached, the monitor displays a message.

 

Cache Monitor Entries

Entry	Description
Name	Name of the cache.
Capacity*	Capacity of the cache, specified during the configuration of the cache.
Ongoing	Current number of entries in the cache. If you select System Overview, the monitor displays the average of all system nodes.
Size	Current size of cache in bytes. The size of the entries is not known for all caches. This is because not every program specifies this entry explicitly when an entry is generated. However, in the case of a Web repository manager, the size is given and can therefore be displayed. If you select System Overview, the monitor displays the average of all system nodes.
Peak*	Maximum number of entries ever stored in each cache.
Added*	Number of items that have been added to the cache since recording began.
Removed*	Number of items that have been removed from the cache since recording began. These items have been overwritten by new items, or have become invalid because they have exceeded the Entry Default Time to Live.
Gets*	Sum of all successful access attempts to the cache entries.
Hits*	Number of all successful access attempts to the cache entries. A successful access attempt means that the entry the system was searching for was found in the cache.
Hits/Gets*	Ratio of hits to gets, specified as a percentage value. The higher the value, the more effective the cache.

* If you select System Overview, the monitor displays for these entries the maximum value measured since the start of measuring on a system in the system landscape.

 

Note that memory caches are reset when the portal is reset. This means that a restart sets the data displayed in the cache monitor back to zero.

 

Activities

You can use the following functions:

Function	Description
Refresh	You use this function to update the contents of a table.
Clear Cache	You use this function to delete the contents of the cache.
Reset Statistics	You use this function to reset the statistics. The entries under Capacity and Current are retained. The ratio of hits to gets is set to 100%.
Select all	You use this function to select all caches.
Deselect All	If you have selected more than one entry, you can remove the selection using this function.

 

You can sort the list displayed according to different criteria. Select the sort criteria you want from the sort field to do this. The arrow to the right of the sort field shows if the list is sorted in ascending or descending order. You can reverse the sort order by clicking on this arrow.

 

Evaluating Displayed Data

Depending on the scenario and the caches used, there are various ways of evaluating the data displayed in the cache monitor.

 

If the displayed peak value over a long period is significantly smaller that the capacity of the cache, you can reduce the capacity of the cache using Content Management ® Utilities ® Caches.

However, if the peak value and the current number of entries in the cache reach the maximum capacity value, increase the capacity of the cache.

 

For more information about this topic, see Caches.