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Don Burleson Blog 







Oracle row count for all tables in schema

Oracle Tips by Burleson Consulting
April 28,  2009

Counting  all of the rows in a schema can require code that actually counts the table rows, and it's hard because rows are constantly being added and deleted from the schema.

So, how do you count up all of the rows for all tables in a schema?

There are two sources of row counts, both of which can become stale:

  • Counts as of time last analyzed:   The num_rows column in dba_tables, current only to the date-time of the last analyze with dbms_stats.

  • Row count at SQL execution time:  The "real" current row count, which requires that you actually issue SQL to count the rows in all of the tables (time consuming).

To count all of the rows in real time, a simple SQL*Plus script will suffice:

spool runme.sql

select 'select count(*) from '||table_name||';' from dba_tables where owner = 'XXX';

spool off


A less intensive approach for estimating the total number of rows in a schema would query the num_rows column, much faster, but only accurate to the time that dbms_stats last counted the rows:

compute sum of counter on report;

   num_rows counter
   owner = 'XXX'
order by

You can also write PL/SQL procedures to count up the number of rows in a schema.

Count each number of table rows


Oracle ACE Laurent Schneider has a more elegant solution for counting tables, using dbms_xmlgen to store the row counts for multiple tables in a single SQL query list:

set pages 999;

col count format 999,999,999;
spool countlist.txt

         dbms_xmlgen.getxml('select count(*) c from '||table_name))
    ,'/ROWSET/ROW/C')) count
order by 

spool off;

TABLE_NAME                      COUNT
------------------------------ ------
DEPT                                4
EMP                                14
BONUS                               0
SALGRADE                            5





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