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  dba_tab_subpartitions tips

Oracle Database Tips by Donald BurlesonApril 1, 2015

Question:  I am comparing the blocks column of dba_tables to the num_blocks of dba_tab_partitons and dba_tab_subpartitions and they do not match!  Why do the block counts not match between dba_tables and dba_tab_partitons and dba_tab_subpartitions?

Answer: 
Oracle only computes the num_* columns (num_rows, num_blocks) when you run dbms_stats, while the blocks column of dba_tables is the current table block count. 

Hence you are comparing current values to older values, at the time that you last ran dbms_stats.  If you immediately run dbms_stats and then re-run your query, you should see much closer latching block values.

There is a last_analyzed column that relates to the time that the num_rows column.

For the whole picture you need to join dba_tables, dba_tab_partitons and dba_tab_subpartitions.

I recommend the Oracle Scripts Download. These scripts account for those anomalies. it is the ones that I use. 

Here is an example script that joins dba_tab_partitons to dba_tab_subpartitions:

col tablespace_name    format  a20
col partition_name     format  a20
col subpartitione_name format  a20

select
   tablespace_name,
   partition_name,
   subpartition_name
from
   dba_tab_subpartitions
where
   table_name='MYTAB'
order by
   subpartition_name;

   
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