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Oracle row count for all tables in schema

Oracle Database Tips by Donald BurlesonApril 28,  2015

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

@runme

Here is a PL/SQL approach for counting all tables in a schema.  Here, you first vonnect as the schema owner:

DECLARE
val NUMBER;
BEGIN
FOR I IN (SELECT TABLE_NAME FROM USER_TABLES) LOOP
EXECUTE IMMEDIATE 'SELECT count(*) FROM ' || i.table_name INTO val;
DBMS_OUTPUT.PUT_LINE(i.table_name || ' ==> ' || val );
END LOOP;
END;
/

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;

select
   table_name,
   num_rows counter
from
   dba_tables
where
   owner = 'XXX'
order by
   table_name;

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

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

spool off;

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

 


 

 

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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