> #### Trending considerations

> You can choose to have Fathom trend performance data to the FathomTrendDatabase. Consider the following points when you are setting trending options:

> - Different trend expectations exist for different resource types. Therefore, each trend interval has a different meaning depending on the data to be trended. Refer to the specific resource type in this guide for detailed information about data trending expectations for each resource type.
> - If you set a trending value in the Trend Performance Data every polls field, Fathom will use the value you provide in combination with the value in the Polling Interval field to calculate the trending interval.
> For example, if you initially set a polling interval of 30 seconds and also set the Trend Performance Data every field to trend data every 3 polls, Fathom will automatically calculate the trending interval as 90 seconds and display this result when you view the summary of the resource monitor's performance.

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