ORA-1445 and maximum width for field selection.

Hello,
We had the ORA-01445 error in the database recently.
A friend of mine directed me to the following address:
http://www.errorhelp.com/search/details/65019/ora-01445
And explained me that Oracle takes every field of every table in the inner and outer joins to build a HUGE table before selecting what fields are really required for the query.
I can't believe that Oracle makes such stupid thing so I ran here to ask the experts.
An example:
Two tables:
TABLE1
Field1
Field2
Field100
TABLE2
Field1
Field2
Field500
Select table1.field1, table2.field1
FROM table1
INNER JOIN table2 on table1.Field2 = table2.Field2
WHERE table1.field3 = '1'
->
Question is:
How the join is built on detail?
Does it build an intermediate table with 100+500 = 600 fields to get only the 5 that are used in the query (table1.field1, table2.field1, table1.Field2, table2.Field2,table1.field3)?
Thank you.
Kindest regards,

864737 wrote:
Hi John,
Maybe it's a complete nonsense but even if has no sense proceeding that way solved the issue here.
I have a query that suddenly failed to execute with the error described, version 10.2.0.3 but it does not happens in 10.2.0.4. As a workaround we did it using subselects and joining as described in the post and the query worked again.
So ORA-01445 is triggered even if it's not the cause of the error. You have there a circumstance where it fits...
So, it is clearly a bug introduced (possibly in 10.2.0.3), and fixed in 10.2.0.4.
I cannot post the query because license restrictions but believe it or not this happens with Oracle. It's great to know that the number fields of the tables does not matter. I was suprised to hear it. But your clarification was good. :D Tnx.
It seems that our DBA found that this behaviour can be corrected with an official patch.
Which clearly indicates a bug, just be sure that the patch is truly the right one.
Thank you again for your response.There are a number of bugs in MOS around ansi joins getting this error, bug
4369235.8 ORA-1445 can occur for ANSI join queries with large views/subqueries
seems possiblefor your case. However the workaround for that was to not use ansi style joins, so again, the number of columns is not directly the cause of the error.
John

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