In the database, insert the data, and if not commit, turn off the database. __ Database

Oracle's commit is to submit the data, before you commit the previous operation, the update is memory, not updated to the physical file.

So you shut down the database without a commit, and the data in the database is not updated. Commit is submitted against: DML
DML (data manipulation Language) requires submission, which is part of data management operations, such as insert (insert), Update (modify), delete (delete);
The DDL (data definition Language) does not need to be committed, in part by defining the data structure, such as create (creation), Alter (Modify), Drop (delete).