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ORA-06502 when referencing trigger var in UTF8 db with char semantics

Adam Donahue



I'm seeing odd behavior in the following situation on an Oracle
installation (SunOS 5.8).

Assume database character set of UTF8, and nls_length_semantics=char
during all creation statements.

create table t1 ( f1 varchar2(4000) );
create table t2 ( f1 varchar2(4000) );

-- no key-based relationship, for simplicity

create trigger t1_trg
before insert or update
on t1
for each row
  insert into t2 values (:new.f1);

When inserting up to 3,999 characters, this works fine. When inserting
4000 characters, I get

ERROR at line 1:
ORA-06502: PL/SQL: numeric or value error

on the trigger.

This also fails:

create trigger t1_trg
before insert or update
on t1
for each row
  myVar varchar2(4000);
  myVar := :new.f1;

(No insert here, but the deref fails. Again, only for inserts of 4000
characters into a varchar2(4000) field with character semantics.)

However, this works:

create trigger t1_trg
before insert or update
on t1
for each row
  myVar varchar2(4000);
  select :new.f1 into myVar;
  insert into t2 values (myVar);

All inserts are US7ASCII data and codepoints. I've tried combinations
of NLS_LANG to no good effect.

I couldn't find anything related on Metalink, AskTom, or TechNet, nor
via a Google search.

Any ideas? I'm wondering if I've encountered a bug.



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