Usage reporting allows you to monitor and report on the usage and growth of the consumption of your DBMS storage. You can view usage reports for tablespaces, tables, segments, and users. Use these reports to:
view detailed information for tablespaces and databases including their total size, used space, empty used space, # of tables and indexes, etc.
identify the tables consuming the most space within your environment. You can view this information at the tablespace, database, and computer level, as well as at a network-wide level.
for Oracle, identify the segments with the most extents and most empty used space. You can view this information at the tablespace, database, and computer level, as well as at a network-wide level.
associate users with the amount of storage they are consuming on specific databases, groups of databases, tablespaces, groups of tablespaces, specific computers, groups of computers, and throughout the entire network.