I am facing problems inserting records into my oracle database 12C R2. I have no Oracle Support. All this time I was able to do inserts into my database, but all of a sudden it is now failing. Below is the query and error:

```
SQL> INSERT INTO MV_IN_SMS_TOTAL SELECT * FROM mv_in_sms_total@newdwhlink.com WHERE START_DATE = '20191101';
INSERT INTO MV_IN_SMS_TOTAL SELECT * FROM mv_in_sms_total@newdwhlink.com WHERE START_DATE = '20191101'
                                   *
ERROR at line 1:
ORA-00600: internal error code, arguments: [ktssinseg2], [60], [7],
[289598865], [], [], [], [], [], [], [], []

```