Here's a weird one

I am running a very simple query against a table
select * from nom_hierarchy where signf=1;
This query causes a Ora-03113 error to occur. If I do a
select * from nom_hierarchy where signf<>1;
it works!
the column signf is defined as NUMBER(1,0) not null default(0)
and there are several of these in the table. I have tried similar queries on those columns and not had a problem.
have put a call into Oracle for this problem. But just wanted let you all know that Oracle does seem to have some weird bugs within it. I've found many query bugs in Oracle and thank god the RULE hint still exists.

> the version is 10gR2
Need the full version number - to the 4th number. 10.1.0.2 is very different than 10.2.0.1 ito patch sets and even possibly some features.
> This column is not indexed, there are two indexes on the table. If one is
corrupt, why does it affect just this query in this way?
That depends on the execution plan. Can you post it when using the CBO (and failing) and when using the RBO?
> I'm not able to check the alert log, The DBA did that and basically he stated
that we are to contact Oracle.
Silly IMO. The first cause of action should be to look at the error code of that internal error and looking it up on Metalink's ORA-600 lookup tool. This often gives an accurate diagnosis of the problem and at times a URL to the bug and patch number applicable to solve it.
> But implying that the CBO is perfect and Oracle not buggy, Maybe I'm just
having some bad luck?
The CBO is more often than not incorrectly understood, abused and then slammed as not working correctly.
My take is that one has to deal with evidence and facts. And the little you have provided do not point to the CBO as being The Problem. And I've only ever ran into a single dinkum real CBO bug - I have a lot more "worse luck" (?) with internal Oracle errors such as DFS lock handles, PL/SQL states being reset for what seems to be no reason, enqueues on flushing warm buffers, etc.
Oracle is not bug free by any means. But it is very far from a buggy product. And my experience says that when dealing with new developers to Oracle, 99% of their so-called Oracle bugs are not - instead these are bugs in their code or in their understanding of an Oracle feature.
Not saying that this is the case with the problem you've reported. Does not at all sound like a "developer-end" induced problem.
But nor would I attribute it immediately to the CBO either. One need to isolate the error before making any call whether or not even Oracle itself is to blame for the error (it could be a corrupted data block for example).
I've once had very nasty Oracle I/O errors.. which turned out to have nothing to do with Oracle itself, but incompatibility issues with the storage vendor's I/O load balancing driver software.
An accurate diagnosis depends on a detailed problem analysis in order to isolate the problem. Any calls made before that is just speculation.

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