Impossible d'insérer une chaîne base64 dans une colonne de type de données clob

Une solution possible pourrait être de diviser la chaîne en morceaux par chariot de retour, puis d'insérer et de remplacer le chariot de retour par une chaîne nulle. Dans ce cas, j'utilise PLSQL

Gardez à l'esprit que j'utilise pour mon exemple une chaîne très longue mais différente de la vôtre

declare
vstr clob := q'[ 9j/4AAQSkZJRgABAAEAYABgAAD//gAcQ3JlYXRlZCBieSBBY2N1U29mdCBDb3JwLgD/wAALCAFIASABAREA/9
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Pbc2ipL/z03SUz7W6p+9t32/7FTW9wkjsqt82Pu/xVaXOz5q//2Q== ]';
begin
insert into t ( c1 ) values ( replace( vstr , chr(13) , '' )  ) ;
commit;
end;
/

Ensuite tu lances le script

SQL> desc t
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 C1                                                 CLOB

SQL> host cat insert.sql
declare
vstr clob := q'[9j/4AAQSkZJRgABAAEAYABgAAD//gAcQ3JlYXRlZCBieSBBY2N1U29mdCBDb3JwLgD/wAALCAFIASABAREA/9
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begin
insert into t ( c1 ) values ( replace( vstr , chr(13) , '' )  ) ;
commit;
end;
/

SQL> @insert.sql

PL/SQL procedure successfully completed.

SQL> select count(*) from t ;

  COUNT(*)
----------
         1

SQL> select length(c1) from t ;

LENGTH(C1)
----------
     13691

SQL> exit
Disconnected from Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production