"Unsupported LOB type" error occurs when executing DBMS_LOB.FRAGMENT_INSERT

Question

Dear all,
I try to run DBMS_LOB.FRAGMENT_INSERT, but got error saying:
ORA-43856: Unsupported LOB type for SECUREFILE LOB operationSuppose I have the following code:
declare
note_clob clob;
note_clob2 clob;
note_bfile bfile;
buffer varchar2(10000);
note_var varchar2(10000);
warning int;
dest_off int:=1;
src_off int:=1;
lang_ctx int:=0;
amount int:=1500;
begin
--Create temp
dbms_lob.createtemporary(note_clob,true);
--Initialize BFILE
note_bfile:=bfilename('TEMP_DIR','note.txt');
--Open bfile
dbms_lob.fileopen(note_bfile);
dbms_lob.loadclobfromfile(note_clob,note_bfile,dbms_lob.lobmaxsize,dest_off,src_off,0,lang_ctx,warning);
dbms_lob.fileclose(note_bfile);
--Fragement Insert
amount:=3;
dest_off:=10;
buffer:='end';
dbms_lob.fragment_insert(note_clob,amount,dest_off,buffer); <==LINE 30
--Read
amount:=50;
dbms_lob.read(note_clob,amount,1,note_var);
dbms_output.put_line(note_var);
end;
/and I got:
ERROR at line 1:
ORA-43856: Unsupported LOB type for SECUREFILE LOB operation
ORA-06512: at "SYS.DBMS_LOB", line 1076
ORA-06512: at line 30What did I miss?
Best regard,
Val

Answer 1

Just a wrap-up (mostly for my own benefit :-) ) :
<li>As I understand the docs, SECUREFILE/BASICFILE is a matter of how the LOB is stored in the table.
<li>SECUREFILE/BASICFILE therefore does not apply to temporary LOBs - they are not stored in a table.
<li>The new FRAGMENT procedures in DBMS_LOB only works on SECUREFILE.
<li>Therefore the FRAGMENT procedures can only work on permanent LOBs in tables in columns defined as SECUREFILE.
<li>And so FRAGMENT procedures cannot work on temporary LOBs at all.
Just loading data into a LOB does not make it permant - it is still temporary until stored in a table.
A workaround would be to create a table with a LOB column defined as SECUREFILE and insert a record into this table.
Then in your code replace the CREATETEMPORARY with selecting that LOB locator from that table.
That way you work on a permanent SECUREFILE LOB in a table rather than a temporary LOB.
Or if the goal of your procedure at some point is to take the LOB and insert into a table, then reverse your logic:
Start with inserting your record with an EMPTY_LOB() (assuming your column is defined SECUREFILE) and use RETURNING clause to retrieve the LOB locator of that inserted LOB.
Then load that LOB from your BFILE and continue from there.
(Or the third workaround is to write the code avoiding use of FRAGMENT procedures ;-) )