> #### Setting the graph cache

> Fathom Management graphing has been enhanced to include a persistent data cache.

> You determine how long you want to keep graph data cache persisted on a per resource instance basis. The default graph cache setting is 48 hours; however, you can change the setting to whatever value you want. Keep in mind that if you change the setting to a longer period of time, more disk space is used to store the growing cache. Additionally, the more data that has been stored, the more data there is to be represented in a graph, and the higher the CPU use will be at the time a graph using the data is created.

> It is recommended that you start with the 48-hour default graph cache setting. You can then increase the value if you want, perhaps by small increments to see what the impact is to the disk space and CPU activity. You might consider setting certain resource types to the 48-hour default, and set others to a different time period, such as twelve hours, to save memory and CPU.

> You select the graph cache settings for resources by choosing Options in the management console.

> To set the graph cache:

> 1. From the Fathom menu bar, choose Options Configuration Graph cache. The Graph Cache Database Configure page appears:

> 2. In the Sample time period to collect field, type the graph cache time period you want to apply to the resources you plan to select. Then choose hours or days. The default time period is 48 hours.
> 3. Select the resources to which you want the graph cache time period to apply to by following these steps:
> 1. In the List resource of type field, optionally select resource types either by choosing from the available resources or by choosing the wildcard ( * ).
> 2. In the for container field, optionally select the containers either by choosing from those available or by choosing the wildcard.
> Note: When you use the wildcard, Fathom includes all current resources of the type or all container(s) you select. The wildcard does not apply, however, to any resources or containers you subsequently create. If you create a new resource, resource type, or container, you must set its graph cache time period.

> 4. Click Apply Filter. The resource types that match the filter specifications appear in the Available list, as shown in the following example:

> 5. Select the resources:
> - To select all the resources in the Available list, click Select All. Then click the right arrow.
> - To choose one or more individual resources, highlight and click each resource you want to include; then click the right arrow.
> The resources appear in the Selected list. The information in angle brackets to the right of each resource name is the current graph cache setting for that resource.

> 6. Review the Selected list. When you finish, click Apply to selected:

> A message appears similar to the following (depending on which resources you select) confirming the resources you are about to affect:

> 1. Click OK to confirm. The Graph Cached Database Configure page appears.
> 2. To verify that the time period was changed correctly for the resources you selected, choose the resources and containers, and click Apply Filter. The Available list shows the resources whose graph cache time period is still set to the 48-hour default as well as those whose time period you have changed (perhaps to 24 hours), as shown in the following example:

Copyright © 2004 Progress Software Corporation www.progress.com Voice: (781) 280-4000 Fax: (781) 280-4095