This document provides an overview of data manipulation language (DML) statements and transaction control in Oracle databases. It describes how to insert, update, delete rows from tables using DML statements like INSERT, UPDATE, DELETE. It also explains how to use the MERGE statement to conditionally insert or update rows. Additionally, it covers transaction control using statements like COMMIT, ROLLBACK, SAVEPOINT and how they affect the state of data. Read consistency and locking mechanisms implemented in Oracle to avoid conflicts during concurrent data access are also summarized.