This illustration shows the Usage Monitor. The Usage Monitor appears on the right side of the Database Home Page and displays as horizontal bar graphs the following two metrics: the amount of space available in your database, and current memory allocation.

In addition, beneath the bar graphs, the Usage Monitor shows the current number of database sessions (active and total), and number of database users (internal, database, and total), and whether Log Archiving (ARCHIVELOG mode) is on or off.