Oracle provides time-series segment statistics for tables and index in the 10g Automated workload Repository tables (AWR). Also see tracking row counts and block changes within tables. wri$_optstat_tab_history is only one of several ways to track table growth.  Also see tracking row counts and block changes within tables.  Also we have the ability to track the growth of the whole schema and database and database growth reports. If you are pre-Oracle10g you can write your own tables to periodically examine and store object sizes for database growth reports by creating your own STATSPACK extension tables (See book "Oracle Tuning: The Definitive Reference", for ready to use scripts to create a stats$tab_stats and stats$idx_stats tracking tables). In Oracle 10g and beyond, displaying table growth is easy because the dba_hist_seg_stat tables provides the delta value for every table and index (Note:  the "total" columns are not implemented as of Oracle 10.0.2). You can also see the growth of the whole database with this Oracle growth tracking script. Below is a great script to display table size changes between two periods.  column "Percent of Total Disk Usage" justify right format 999.99 column "Space Used (MB)" justify right format 9,999,999.99 column "Total Object Size (MB)" justify right format 9,999,999.99 set linesize 150 set pages 80 set feedback off   select * from (select to_char(end_interval_time, 'MM/DD/YY') mydate, sum(space_used_delta) / 1024 / 1024 "Space used (MB)", avg(c.bytes) / 1024 / 1024 "Total Object Size (MB)", round(sum(space_used_delta) / sum(c.bytes) * 100, 2) "Percent of Total Disk Usage" from    dba_hist_snapshot sn,    dba_hist_seg_stat a,    dba_objects b,    dba_segments c where see code depot download for full scripts begin_interval_time > trunc(sysdate) - &days_back and sn.snap_id = a.snap_id and b.object_id = a.obj# and b.owner = c.owner and b.object_name = c.segment_name and c.segment_name = '&segment_name' group by to_char(end_interval_time, 'MM/DD/YY')) order by to_date(mydate, 'MM/DD/YY'); A sample of this report show the total database growth between the two snapshot periods.  Also see using v$datafile to track database growth Historical table & index growth reports select * from (SELECT o.OWNER , o.OBJECT_NAME , o.SUBOBJECT_NAME , o.OBJECT_TYPE ,     t.NAME "Tablespace", s.growth/(1024*1024) "Growth in MB",     (SELECT sum(bytes)/(1024*1024*1024)     FROM dba_segments     WHERE segment_name=o.object_name) "Total Size(GB)" FROM DBA_OBJECTS o,     ( SELECT TS#,OBJ#,         SUM(SPACE_USED_DELTA) growth    FROM DBA_HIST_SEG_STAT     GROUP BY TS#,OBJ#     HAVING SUM(SPACE_USED_DELTA) > 0     ORDER BY 2 DESC ) s,     v$tablespace t WHERE s.OBJ# = o.OBJECT_ID AND s.TS#=t.TS# and o.owner='XXXXXX' and o.object_type='TABLE' ORDER BY 6 DESC) where rownum<20;