substr function failure

Hi, can someone tell me why a simple substr would throw an error if the varchar target assignment is not larger than the length supplied in the substr function three characters?

can someone tell me why:

declare
v_legal varchar2 (200);
v_disp_trans_sid integer: = 850500;

Start

v_legal: = SUBSTR (Ttls_Common.build_parcel_string (v_disp_trans_sid), 1, 200);
dbms_output.put_line ('v_legal is' |) Length (v_legal) | 'characters.');

end;
/

This causes even if the assignment is substr to 200:

declare
*
ERROR on line 1:
ORA-06502: PL/SQL: digital or value error: character string buffer too small
ORA-06512: at line 7

Yet once I increase the size of the target varchar by three characters it works:

declare
v_legal varchar2 (203);
v_disp_trans_sid integer: = 850500;

Start

v_legal: = SUBSTR (Ttls_Common.build_parcel_string (v_disp_trans_sid), 1, 200);
dbms_output.put_line ('v_legal is' |) Length (v_legal) | 'characters.');

end;
/

causes:

v_legal is 200 characters.

PL/SQL procedure successfully completed.

user521233 wrote:
my character set:

Yes, UTF8 is multibyte. Search NLS_LENGTH_SEMANTICS now:

Select the value from nls_session_parameters where parameter = "NLS_LENGTH_SEMANTICS."

Most likely it is the BYTE value. If so, as I already mentioned, you can specify explicitly:

v_legal varchar2 (200 char);

or you can define the semantics of length for your session of characters instead of bytes

ALTER SESSION SET NLS_LENGTH_SEMANTICS = CHAR;

or you can assign this TANK once for the instance:

ALTER SYSTEM SET NLS_LENGTH_SEMANTICS = CHAR;

and bounce th instance.

SY.

Tags: Database

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