numeric overflow in 10g

  • From: "Herring Dave - dherri" <Dave.Herring@xxxxxxxxxx>
  • To: <oracle-l@xxxxxxxxxxxxx>
  • Date: Fri, 24 Oct 2008 11:27:33 -0500

Has anyone run into this issue in 10g?  We're running on RHEL 4.x.  
We've hit something matching bug 3591135:

   v_base number;
   v_base:= 100000000 * 22;
   dbms_output.put_line ('Success');  

ERROR at line 1:
ORA-01426: numeric overflow
ORA-06512: at line 4

I change the literal "22" to either "21" or "22.0" and it works.  According to 
what I've found on Metalink, Oracle doesn't view this as a bug:

The following has been added to the "Upgrading SQL*Plus Scripts and PL/SQL" 
section of Database Upgrade Guide: 
Evaluation of Numeric Literals 
Evaluation of numeric literals has changed in 10g such that at least one of the 
constants in a numeric computation with literals must be a decimal specified to 
the 10th place.  This is because 10g uses INTEGER arithmetic (approximately 9 
significant digits) for some expressions whereas Oracle 9i release 2 used 
NUMBER arithmetic (approximately 38 significant digits). Therefore, if you are 
dealing with results of greater than 9 significant digits, one of the literals 
should be in decimal format to prevent numeric overflow errors.  For example, 
in release 10g the computation of v1 in the following example causes a numeric 
overflow error. 
  v1 NUMBER(38); 
  v1 := 256*256*256*256; 
The solution to the error is to specify one of the numeric literals as a 
decimal (256.0), as follows: 
  v1 NUMBER(38); 
  v1 := 256*256*256*256.0; 

That's just great, but its happening with Affinium Campaign and they can't seem 
to reproduce the issue in their tests, even with our data and matching Oracle 
install.  Plus I'd rather not rely on them.


Dave Herring, DBA |   A c x i o m  M I C S / C S O
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