临时处理办法：

delete from aq$_ss_MT_tab_D;
delete from aq$_ss_MT_tab_g;
delete from aq$_ss_MT_tab_h;
delete from aq$_ss_MT_tab_i;
delete from aq$_ss_MT_tab_p;
delete from aq$_ss_MT_tab_s;
delete from aq$_ss_MT_tab_t;
commit;

根本处理办法：

重建aq：admin用户操作

--1.停止和删除aq

exec dbms_aqadm.stop_queue('sms_mt_queue'); 

exec dbms_aqadm.drop_queue('sms_mt_queue'); 

exec dbms_aqadm.drop_queue_table('ss_mt_tab'); 

/

--2.创建队列表

begin dbms_aqadm.create_queue_table(queue_table=>'ss_mt_tab', queue_payload_type=>'SYS.AQ$_JMS_TEXT_MESSAGE',multiple_consumers => true); end;

/

--3.创建队列

exec dbms_aqadm.create_queue(queue_name=>'sms_mt_queue', queue_table=>'ss_mt_tab');

/

--4.启动队列

EXECUTE DBMS_AQADM.START_QUEUE (Queue_name => 'SMS_MT_QUEUE');

相关参考：
https://blog.csdn.net/jycjyc/article/details/93617814