How to purge an Advanced Queue in Oracle
DBMS_AQADM.PURGE_QUEUE_TABLE it is equivalent for truncate table. Also look at this error message when you try truncate queue table
ORA-24005: Inappropriate utilities used to perform DDL on AQ table %s.%s *Cause: An attempt was made to use the SQL command DROP TABLE or TRUNCATE TABLE or ALTER TABLE on queue metadata or tables. *Action: Use the DBMS_AQADM.DROP_QUEUE_TABLE to DROP TABLE, DBMS_AQADM.PURGE_QUEUE_TABLE to TRUNCATE TABLE. ALTER TABLE redefinition based on only ALTER_TABLE_PROPERTIES and ALTER_TABLE_PARTITIONING clauses are allowed.Tom Kyte has already written info about often truncating table https://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:47911859692542