Oracle PRC C Learning five transactions

I didn't understand when this business started.

I thought it was a structure, or a package or a procedure,

Later I think I want to understand the point, in fact, this business is just a thing I want to complete, this thing I do not finish, otherwise it is not finished, not finished to return to the beginning

State, or go back to a state that you have set.

If a SQL statement begins in the program, a transaction begins, and when you feel that the transaction is complete, call commit, which is the completion of the

A transaction, of course, can also be used rollback, is to roll back the business to do. And when this is done, the completion is the completion of the failure.

It should be said that this is the end of the matter.

To set up a read transaction, you must start with this sentence:

EXEC SQL SET TRANSACTION READ only;

Oracle PRC C Learning five transactions