ENDOCP1P > @physical

DATE                 PHYSICAL_READS_LAST_HOUR OBJECT_NAME
-------------------- ------------------------ --------------------
2013-11-03 Monday                        6054 D_1F000D5D80000910
2013-11-03 Monday                       26179 D_1F000D5D80000005
2013-11-03 Monday                       40332 D_1F000D5D80000901
2013-11-03 Monday                       46808 DM_SYSOBJECT_S_COMP2
2013-11-03 Monday                       64930 DM_RELATION_S
2013-11-03 Monday                       78228 NFL_CONTENT_R_COMP1
2013-11-03 Monday                       79647 DM_SYSOBJECT_S_COMP1
2013-11-03 Monday                      135421 DMR_CONTENT_S
2013-11-03 Monday                      165087 NFL_CONTENT_R
2013-11-03 Monday                      243480 DM_SYSOBJECT_R_COMP1
2013-11-03 Monday                      548052 D_1F000D5D8000010A
2013-11-03 Monday                     1475076 DM_SYSOBJECT_R_COMP2

ENDOCP1P > list
  1  select to_char(c.BEGIN_INTERVAL_TIME,'YYYY-MM-DD Day') "DATE",
  2  sum(b.PHYSICAL_READS_DELTA) PHYSICAL_READS_LAST_HOUR,
  3  a.object_name
  4  from dba_objects a,dba_hist_seg_stat b,sys.wRM$_SNAPSHOT c
  5  where b.SNAP_ID =(select max(SNAP_ID) from sys.wRM$_SNAPSHOT)
  6  and a.object_id=b.OBJ#
  7  and b.PHYSICAL_READS_DELTA>0
  8  and c.instance_number=(select instance_number from v$instance)
  9  and c.snap_id=b.snap_id
 10  group by to_char(c.BEGIN_INTERVAL_TIME,'YYYY-MM-DD Day'),a.object_name
 11* order by 2

ENDOCP1P > @logical

DATE                 LOGICAL_READS_LAST_HOUR OBJECT_NAME
-------------------- ----------------------- --------------------
2013-11-03 Monday                      12096 DM_REGISTERED_R
2013-11-03 Monday                      12176 WRH$_SEG_STAT_OBJ_PK
2013-11-03 Monday                      17232 LOB$
2013-11-03 Monday                      20448 OBJ$
2013-11-03 Monday                      23488 DM_SYSOBJECT_S_COMP2
2013-11-03 Monday                      35184 I_SYSAUTH1
2013-11-03 Monday                      36432 D_1F000D5D8000000F
2013-11-03 Monday                      93744 DM_SYSOBJECT_R_COMP2
2013-11-03 Monday                     163344 DM_SYSOBJECT_R_COMP1
2013-11-03 Monday                     249952 DM_SYSOBJECT_R
2013-11-03 Monday                     321568 D_1F000D5D80000901
2013-11-03 Monday                     790624 DM_SYSOBJECT_S
2013-11-03 Monday                     830560 NFL_CONTENT_S
2013-11-03 Monday                    1408384 D_1F000D5D80000109

ENDOCP1P > list
  1  select to_char(c.BEGIN_INTERVAL_TIME,'YYYY-MM-DD Day') "DATE",
  2  sum(b.LOGICAL_READS_DELTA) LOGICAL_READS_LAST_HOUR,
  3  a.object_name
  4  from dba_objects a,dba_hist_seg_stat b,sys.wRM$_SNAPSHOT c
  5  where b.SNAP_ID =(select max(SNAP_ID) from sys.wRM$_SNAPSHOT)
  6  and a.object_id=b.OBJ#
  7  and b.LOGICAL_READS_DELTA>0
  8  and c.instance_number=(select instance_number from v$instance)
  9  and c.snap_id=b.snap_id
 10  group by to_char(c.BEGIN_INTERVAL_TIME,'YYYY-MM-DD Day'),a.object_name
 11* order by 2

Also look at what is taking up all the memory, many times tables that are missing 
indexes will hog all the memory and force unnecessary disk reads.

ENDOCP1P > @v$bh

OBJECT_TYPE DB       MEG_IN_MEMORY OBJECT_IN_MEMORY
----------- -------- ------------- -----------------------------------------
TABLE       NDOCP2            1050 NFLPROD.NFL_CONTENT_S
TABLE       NDOCP1            2981 NFLPROD.DM_SYSOBJECT_S
TABLE       NDOCP3            3219 NFLPROD.DM_SYSOBJECT_S
TABLE       NDOCP4            3688 NFLPROD.DM_SYSOBJECT_S
TABLE       NDOCP2            3740 NFLPROD.DM_SYSOBJECT_S

ENDOCP1P > list
  1  SELECT
  2  o.object_type,i.instance_name db,COUNT(*)*8192/1024/1024 meg_in_memory,
  3  o.owner||'.'||o.OBJECT_NAME Object_in_Memory
  4       FROM DBA_OBJECTS o, gV$BH bh, gv$instance i
  5      WHERE o.DATA_OBJECT_ID = bh.OBJD
  6      and bh.status<>'free'
  7      and bh.inst_id = i.inst_id
  8  and o.object_name like upper('%%')
  9      GROUP BY o.owner||'.'||o.OBJECT_NAME,o.object_type,i.instance_name
 10      having count(*)>0
 11*     ORDER BY COUNT(*)