Hi Lester, Thank you for your response. I see your point. I am going to try using an isolated processor but the problem seems to be with MySql instance. It stores the table schema for table 'xyz'. This means that if table 'xyz' has an assigned primary key, say 'p1', and I drop this table and recreate it with the same name and try to name a composite primary key 'p1,k1', and then run my nifi flow with updated avro, the PutSql processor will continue to throw errors because the original schema for table 'xyz' has been stored in the registry. It seems that the only solutions, and the two which have worked for me, are to either rename the table such as call it xyz1 or to create the same table in a new database. Of course, i can flush the schema registry and logs but that will delete other tables also which I do not want to do. As per my understanding, the problem lies with MySql instance and not Nifi. Do you think otherwise? ... View more