Is it possible to create this kind of DBLINK?

Hello Sirs, how are you?
I've been trying to create a new "PUBLIC DATABASE LINK" that will connect two instances located on different places geographically speaking. The fist step I took was to create an entry on local tnsnames.ora file, using NETMGR and after, the second step, I created the DBLINK with the following syntax:
CREATE PUBLIC DATABASE LINK "DBX"
CONNECT TO <user> IDENTIFIED BY <pass>
USING '<service_configured_with_netmgr>';
So, the message Oracle gave me after issuing the command above was "public database link "DBX" created". Finishing this ride, I selected the number 1 from dual@DBX and the result was...
SQL> select 1 from dual@DBX;
select 1 from dual@DBX
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-06502: PL/SQL: numeric or value error: character string buffer too small
ORA-06512: at line 272
ORA-02063: preceding 3 lines from DBX
Any idea about that problem? Thanks!
Edited by: Wagner Bianchi on 09/04/2012 12:03

I haven't done much of this, so I'm only speculating.
I think you are seeing the effects of implicit conversions.
> desc dual
Name Null? Type
DUMMY VARCHAR2(1)Your number 1 in the select is being converted to a varchar, and due to the different NLS semantics of the two db's, it expects a larger size in one. So when it goes to the other, you get a too-bit-too-fit error. I would expect more to be different than just the two NLS you listed, though, are the db charactersets different? Perhaps someone else is set up to test these things.
There are various bugs associated with these two NLS settings, maybe you are hitting a consequential one (that is, you are seeing the effects of a bug that is unknown or listed as having different effects). Search MOS bugs for the settings. Do you have any other errors in the alert log or in any apps? What patch level/version/platform are you on?

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