About caching
When you run a report, the scope of the report is examined, and then the product checks if the cache contains the same report, for the same scope. If it does, the results are displayed from the cache. If the combination does not exist, the report is run from the database, saved in the cache, and then sent to the user interface. Cached reports are shared across users who belong to the same home host group. When a report is served from the cache, an indicator icon is displayed on reports and dashboards. You can roll over the indicator to show the age of the report from the cache. Click the icon to purge the old report from the cache and rerun the report from the database.