This is a screenshot of the Undo Management page with the System Activity subpage displayed. At the top of the subpage is the section "System Activity During Analysis Period." This has a a number of fields that show system activity, the most important of which is the Longest Running Query field. The fields are arranged vertically. Below this section is a graph of Undo Tablespace Usage. The x-axis is time (currently spanning six days) and the y-axis is undo tablespace size. Colored areas under the curve show the amount of space available for reuse, retained for use by queries or Flashback, and used by active transactions. The graph shows no change in tablespace size over the period, but shows growth in the amount of undo retained.