RE: DBA_TABLES.NUMROWS not equal Count(*) ... Why?

Well, what stats are you setting?  

I think you want to use dbms_stats.gather_table_stats rather than set_table_stats which will arbitrarily set them to whatever is saved.  

-- 
Mark J. Bobak 
Senior Oracle Architect 
ProQuest Information & Learning 

"Exception:  Some dividends may be reported as qualified dividends but
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but not the day you acquired it. See the examples below. Also, when
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days during which your risk of loss was diminished.  See Pub. 550 for
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  --IRS, Form 1040-A Instruction Booklet, Line 9b:  Qualified Dividends 

 

________________________________

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Sam Bootsma
Sent: Thursday, February 16, 2006 4:12 PM
To: oracle-l_at_freelists.org
Subject: DBA_TABLES.NUMROWS not equal Count(*) ... Why?



Dbms_stats tells me there are 2000 rows, but count(*) says there are
about 3.2 million.  Can anybody explain to me what is going on?  Please
see below.  Thanks.

 

 

SQL> exec dbms_stats.set_table_stats('GENERAL','GUROUTP');

 

PL/SQL procedure successfully completed.

 

SQL> 

SQL> declare

  2  lNumRows number;

  3  lNumBlks number;

  4  lAvgRLen number;

  5  begin

  6  dbms_stats.get_table_stats('GENERAL','GUROUTP',numrows=>lNumRows,
numblks=>lNumBlks, avgrlen=>lAvgRLen);

  7  dbms_output.put_line('No. of rows: ' || lnumrows);

  8  dbms_output.put_line('No. of blks: ' || lnumblks);

  9  dbms_output.put_line('Avg row length: ' || lavgrlen);

 10  end;

 11  /

No. of rows: 2000

No. of blks: 100

Avg row length: 100

 

PL/SQL procedure successfully completed.

 

SQL> 

SQL> select count(*) from general.guroutp;

 

  COUNT(*)

----------

   3219298

 

1 row selected.

 

 

Sam Bootsma

Oracle DBA

George Brown College

sbootsma_at_gbrownc.on.ca <mailto:sbootsma_at_gbrownc.on.ca> 

416-415-5000 x4933

 


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