The Request/Response Xact/s dataflow depicts the rate at which applications and the database manager are completing commits and rollbacks within the database or partition.
At each refresh, Spotlight captures the following statistic and displays it just above the dataflow:
The line graph that appears over the dataflow charts the completed transaction rate over the series of refreshes that occur during the Spotlight session.
Click the Request/Xact/s dataflow to open the Top SQL drilldown. This drilldown provides details about the SQL statements currently running (or recently run) on the database or partition and helps you pinpoint problem SQL.