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Don Burleson Blog 









Oracle Table Usage

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:

The dba_hist_seg_stat table has a wealth of total and delta information (delta values are great for quickly comparing changes between snapshots).

We have columns in dba_hist_seg_stat for RAC segment monitoring:  

We also have columns in dba_hist_seg_stat to monitor segment space usage:


Best of all, the dba_hist_seg_stat table has information of table usage, especially the buffer gets (logical reads), disk reads (physical reads) and the number of full-scans experienced by the segment:




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

ttitle 'Physical Reads for GEN_PERSON table'

   to_char(begin_interval_time,'yy/mm/dd/hh24')     c1,
   physical_reads_total    c2
   dba_hist_seg_stat       s,
   dba_hist_seg_stat_obj   o,
   dba_hist_snapshot       sn
   o.owner = 'SCHEMA_07'
   s.obj# = o.obj#
   sn.snap_id = s.snap_id
   object_name = 'GEN_PERSON'
order by
Now, a quick paste into the MS Excel spreadsheet and the chart wizard gives us a great trend line for physical reads on this table:

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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