The UTLESTAT report shows I/O per tablespace but one cannot see
what tables in the tablespace has the most I/O. The
$ORACLE_HOME/rdbms/admin/catio.sql script creates a sample_io
procedure and table to gather the required information. After
executing the procedure, one can do a simple SELECT * FROM
io_per_object; to extract the required information. For more details,
look at the header comments in the
$ORACLE_HOME/rdbms/admin/catio.sql script.