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Don Burleson Blog

Tracking & Monitoring table growth

Oracle Database Tips by Donald Burleson

In Oracle 10g we have the dba_hist_seg_stat table with a wealth of information about all active segments within the database, including the space usage in the space_allocated_total and space_used_total columns.

Also see AWR solutions to table growth reports. and

This script will show "spaced used total" for a specific table:

col c1 format a15 heading 'snapshot|date'

col c2 format a25 heading 'table|name'

col c3 format 999,999,999 heading 'space|used|total'

select

to_char(begin_interval_time,'yy/mm/dd hh24:mm') c1,

object_name c2,

space_used_total c3

from

dba_hist_seg_stat s,

dba_hist_seg_stat_obj o,

dba_hist_snapshot sn

where
see code depot download for full scripts

o.owner = 'SCHEMA_07'

and

s.obj# = o.obj#

and

sn.snap_id = s.snap_id

and

object_name like 'XIF2%'

order by

begin_interval_time;

As I note in my book Oracle Tuning: The Definitive Reference, we can quickly plot this information for trending and predictions:

snapshot        table
date            name                      SPACE_USED_TOTAL
--------------- ------------------------- ----------
06/03/24 07:03 XIF2IMM_FLIGHT_OCCURRENCE    24,340
06/03/26 07:03 XIF2IMM_FLIGHT_OCCURRENCE    34,468

As we can see, the dba_hist_seg_stat view is a wonderful way to capture object-level space and usage information for predictive modeling purposes.

This is part of my latest book "Oracle Tuning: The Definitive Reference".

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts:

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