CREATE TABLE dropme_t 
  ( x XMLTYPE
  , c CLOB 
  ) XMLTYPE x STORE AS BINARY XML
  , lob(c) store as SECUREFILE ;

select * from user_lobs where table_name ='DROPME_T';

select * 
  from user_objects 
 where object_name in (select segment_name from user_lobs where table_name ='DROPME_T');

CREATE TABLE dropme_t
  ( x XMLTYPE
  ) XMLTYPE x STORE AS BINARY XML
  ;

Table created

insert into dropme_t
  select xmltype(to_clob(utl_compress.lz_uncompress(request)))
   from soap_log
  where rownum=1
  ;

1 row inserted

select TABLE_NAME, COLUMN_NAME, DATA_TYPE, COLUMN_ID
     , HIDDEN_COLUMN, VIRTUAL_COLUMN, SEGMENT_COLUMN_ID
  from user_tab_cols where table_name = 'DROPME_T';

TABLE_NAME      COLUMN_NAME     DATA_TYPE        COLUMN_ID HIDDEN_COLUMN VIRTUAL_COLUMN SEGMENT_COLUMN_ID
--------------- --------------- --------------- ---------- ------------- -------------- -----------------
DROPME_T        X               XMLTYPE                  1 NO            YES            
DROPME_T        SYS_NC00002$    BLOB                     1 YES           NO                             1

select length(SYS_NC00002$)
     , lengthb(SYS_NC00002$)
     , SYS_OP_OPNSIZE(SYS_NC00002$)
     , length(xmltype.getClobVal(x))
     , SYS_OP_OPNSIZE(x)
  from dropme_t
  ;

LENGTH(SYS_NC00002$) LENGTHB(SYS_NC00002$) SYS_OP_OPNSIZE(SYS_NC00002$) LENGTH(XMLTYPE.GETCLOBVAL(X)) SYS_OP_OPNSIZE(X)
-------------------- --------------------- ---------------------------- ----------------------------- -----------------
               71550                 71550                          139                        393918               147

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