SELECT a.snap_id,
    c.tablespace_name ts_name,
    to_char(to_date(a.rtime, 'mm/dd/yyyy hh24:mi:ss'), 'yyyy-mm-dd hh24:mi') rtime,
    round(a.tablespace_size * c.block_size / 1024 / 1024, 2) ts_size_mb,
    round(a.tablespace_usedsize * c.block_size / 1024 / 1024, 2) ts_used_mb,
    round((a.tablespace_size - a.tablespace_usedsize) * c.block_size / 1024 / 1024,2) ts_free_mb,
    round(a.tablespace_usedsize / a.tablespace_size * 100, 2) pct_used
FROM dba_hist_tbspc_space_usage a, 
(SELECT tablespace_id,
        substr(rtime, 1, 10) rtime,
        max(snap_id) snap_id
  FROM dba_hist_tbspc_space_usage nb
  group by tablespace_id, substr(rtime, 1, 10)) b,
dba_tablespaces c,
v$tablespace d
where a.snap_id = b.snap_id
and a.tablespace_id = b.tablespace_id
and a.tablespace_id=d.TS#
and d.NAME=c.tablespace_name 
and to_date(a.rtime, 'mm/dd/yyyy hh24:mi:ss') >=sysdate-30
order by a.tablespace_id,to_date(a.rtime, 'mm/dd/yyyy hh24:mi:ss') desc;

可以计算出某个用户每天大概增长的数据量，然后以此来计算一个月或着一年的增长量；

Oracle查看整个实例的数据量增长：

SELECT day,total_GB,used_GB,total_GB-used_GB free_GB,round(100*used_GB/total_GB,2) used_percent,case when(used_GB=used_GB-LAG(used_GB,1,0)OVER(ORDER BY day)) then null else used_GB-LAG(used_GB,1,0)OVER(ORDER BY day) end incr_GB
 from 
 (select to_char(snap.END_INTERVAL_TIME, 'yyyy-mm-dd hh24:mi:ss.ff') day,
       round(sum(tsu.TABLESPACE_SIZE * dt.BLOCK_SIZE) / (1024 * 1024 * 1024),2) total_GB,
       round(sum(tsu.TABLESPACE_USEDSIZE * dt.BLOCK_SIZE) / (1024 * 1024 * 1024),2) used_GB
  from DBA_HIST_TBSPC_SPACE_USAGE tsu,
       DBA_HIST_SNAPSHOT          snap,
       V$TABLESPACE               vt,
       DBA_TABLESPACES            dt
 where tsu.SNAP_ID = snap.SNAP_ID
   and tsu.DBID = snap.DBID
   and snap.instance_number = 1
   and tsu.TABLESPACE_ID = vt.TS#
   and vt.NAME = dt.TABLESPACE_NAME 
   and SUBSTR(to_char(END_INTERVAL_TIME, 'yyyy-mm-dd hh24:mi:ss.ff'),12,5)='00:00'
 group by snap.END_INTERVAL_TIME
 order by snap.END_INTERVAL_TIME desc) a 
 order by day desc;