13.4.2. Statements That Cannot Be Rolled Back
Some statements cannot be rolled back. In general, these include
data definition language (DDL) statements, such as those that
create or drop databases, those that create, drop, or alter
tables or stored routines.
You should design your transactions not to include such
statements. If you issue a statement early in a transaction that
cannot be rolled back, and then another statement later fails,
the full effect of the transaction cannot be rolled back in such
cases by issuing a ROLLBACK statement.
