To monitor the activity of the top 100 tablespaces selected by size in the database, follow these steps:
From the Administration menu, choose Storage, then select Information Lifecycle Management.
Enterprise Manager displays the Information Lifecycle Management page.
On the Information Lifecycle Management page, you can view the Top 100 Tablespace Activity Heat Map based on the last access time, last write time, last full scan time, and last look up scan time.
By default, the size of each box in the heat map represents a tablespace within a heat map and is determined by tablespace size. You can then use Information Lifecycle Management to drill down from tablespace to object to segment level heat maps.