PLS-00307: too many declarations of 'TO_CHAR' match this call - WHY???? Whats the fix?

Can anyone tell me why the following works:
SELECT  m.value||'\'||'ORA'||ltrim(to_char(p.spid,'00000'))||'.trc'
FROM v$session s, v$process p, v$instance i, v$parameter m  
WHERE m.name = 'user_dump_dest' AND p.addr= s.paddr AND userenv('SESSIONID') = s.audsid
AND s.server='DEDICATED';  

but the following gives me an annoying PLS-00307: too many declarations of 'TO_CHAR' match this call
error:
CREATE OR REPLACE PROCEDURE rssyncit1 IS
location varchar2(255);
BEGIN
   dbms_utility.exec_ddl_statement('alter database backup controlfile to trace');
   SELECT iv.traceloc
    INTO location
    FROM (
      SELECT m.value||'\'||'ORA'||ltrim(to_char(p.spid,'09999'))||'.trc' traceloc
      FROM v$session s, v$process p, v$instance i, v$parameter m
      WHERE m.name = 'user_dump_dest' AND p.addr= s.paddr AND userenv('SESSIONID') = s.audsid
      AND s.server='DEDICATED'
    ) iv;
      insert into mycontrol_files values(location);
   EXCEPTION
     WHEN NO_DATA_FOUND THEN
       NULL;
     WHEN OTHERS THEN
       -- Consider logging the error and then re-raise
       RAISE;
END rssyncit1;
/


LVL 2
Robert SilverSr. Software EngineerAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
what about this:

CREATE OR REPLACE PROCEDURE rssyncit1 IS
location varchar2(255);
BEGIN
   dbms_utility.exec_ddl_statement('alter database backup controlfile to trace');
      insert into mycontrol_files
       SELECT m.value||'\ORA'||ltrim(to_char(p.spid,'00000'))||'.trc' traceloc
      FROM v$session s, v$process p, v$instance i, v$parameter m
      WHERE m.name = 'user_dump_dest' AND p.addr= s.paddr AND userenv('SESSIONID') = s.audsid
      AND s.server='DEDICATED'
;
   EXCEPTION
     WHEN NO_DATA_FOUND THEN
       NULL;
     WHEN OTHERS THEN
       -- Consider logging the error and then re-raise
       RAISE;
END rssyncit1;
/
0
Robert SilverSr. Software EngineerAuthor Commented:
Actually I figured out the problem. See I was runing to_char()  on a varchar and not a number.
Odd though that it only fails in a function. My solution was to
change it like so:  Note that I added a, to_number() function to convert the varchar to a number first.
CREATE OR REPLACE PROCEDURE rssyncit1 IS
location varchar2(255);
BEGIN
   dbms_utility.exec_ddl_statement('alter database backup controlfile to trace');
   SELECT iv.traceloc
    INTO location
    FROM (
      SELECT m.value||'\'||'ORA'||ltrim(to_char(to_number(p.spid),'09999'))||'.trc' traceloc
      FROM v$session s, v$process p, v$instance i, v$parameter m
      WHERE m.name = 'user_dump_dest' AND p.addr= s.paddr AND userenv('SESSIONID') = s.audsid
      AND s.server='DEDICATED'
    ) iv;
      insert into mycontrol_files values(location);
   EXCEPTION
     WHEN NO_DATA_FOUND THEN
       NULL;
     WHEN OTHERS THEN
       -- Consider logging the error and then re-raise
       RAISE;
END rssyncit1;
0

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