SQL>
SQL> create table t ( r raw(10) );
Table created.
SQL>
SQL> insert into t values ( utl_raw.cast_to_raw('helloWorld' ) );
1 row created.
SQL>
SQL> select utl_raw.length(r), length(r)/2 from t;
UTL_RAW.LENGTH(R) LENGTH(R)/2
----------------- -----------
10 10
SQL>
SQL> drop table t;
Table dropped.
SQL>