So does that mean Create table statements force a commit to the DB even if Autocommit is 0 and I never explicitly called commit?
Try it and see. I suppose it makes sense; CREATE TABLE is DDL; INSERT is DML; and only some databases (PostgreSQL, for instance) know how to do transactional DDL.
Transactional DDL example:
# begin; --> start a transaction
create table testtable(id serial, c text); --> ... and create a tabl
# insert into testtable (c) values ('this will be short-lived'); -->
+insert a row
INSERT 0 1
# select * from testtable; --> have a look
id | c
1 | this will be short-lived
# rollback; --> go back to initial state before begin
# select * from testtable; --> now the table is gone...
ERROR: relation "testtable" does not exist
LINE 1: select * from testtable;
You get the idea...
Update: added a DDL transaction begin-create-rollback session.