Art of BI: Row Count for all Tables

Recently a client wanted all the row counts from specific tables on a given scheme.  The list of tables to have their row counts documented was at about 50, which accounted for about 90% of the table objects in the scheme.  At first I was going to use the “Update Row Count” feature in OBI as this is where the project was grounded.  Then, I thought there had to be an easier approach.  Using the script below I was able to get the counts and simply eliminate the objects that where in the not needed 10%. The database we were using is Oracle so the PL/SQL won’t work for MS SQL Server. I will try to find the old SQL Server code I used to do this on a previous project and post it here as well at a later time.


set serveroutput on
declare
row_cnt number;
begin
for x in (select table_name
from user_tables
order by table_name) loop
execute immediate
'select count(*) from '
||x.table_name into row_cnt;
dbms_output.put_line(rpad(x.table_name,30)||lpad(to_char(row_cnt),7));
end loop;
end;
/

a variation of this is:

Set heading off
Set feedback off
Set pagesize 0
Set termout off
Set trimout on
Set trimspool on
Set recsep off
Set linesize 100
Column d noprint new_value date_
Column u noprint new_value user_
Spool tmp
Select 'Select '''||table_name||' : ''||count(*) from '||table_name||';',
to_char(sysdate, 'YYYYMMDDHH24MISS') d, user u
from user_tables
order by table_name
/
Spool off
Spool count_&user_._&date_
@tmp.LST
Spool off

References:

http://vivekagarwal.wordpress.com/2007/07/17/how-to-determine-row-count-for-all-tables-in-an-oracle-schema/
http://www.tek-tips.com/viewthread.cfm?qid=1393349&page=23

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Christian Screen
Christian is an innovator in analytics and data warehousing design, best practices, and delivery. With more than fifteenyears of decision support and data warehousing with key experiences at Office Depot HQ, Sierra-Cedar, and Capgemini, he oversees the Oracle Analytics Practice which includes the technical development and delivery of Oracle BI collaboration software, data warehouse solutions, Oracle BI/EPM projects, and packaged analytics solutions at Datavail.

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3 thoughts on “Art of BI: Row Count for all Tables”
  1. You might also consider collecting fresh statistics for those tables and then
    select num_rows from dba_tables where table_name = 'DESIRED TABLE NAME';

  2. I was working on something else and landed up in this post. I wasn't really looking for a post on row counts but it does help. I have been relying on ALL_OBJECTS but this is far better way to get the counts. Thanks for the post! It really helps.