The Oracle RDBMS provides a transaction model based on a unit of work. The PL/SQL language supports most, but not all, of the database model for transactions (you cannot, for example, ROLLBACK FORCE). Transactions begin with the first change to data and end with either a COMMIT or ROLLBACK. COMMIT makes the database changes permanent and visible to other database sessions. ROLLBACK undoes the changes made in the current transaction either to the beginning of the transaction or to a savepoint. A savepoint is a named processing point in a transaction, created with the SAVEPOINT statement. Rolling back to a savepoint is a partial rollback of a transaction, wiping out all changes (and savepoints) that occurred later than the named savepoint.
Based on query condition. it will update all the fields which are mentioned in the query. ex: update employee set firstname= @firstname,lastname=@lastname where employee_id =@employee_id. so in the above case nothing wil be happen if you used where clause or not. if you have many statements in the query you need to use the where clause.
INSERT - Add a new record into the database table. MODIFY - If record is available it modifies otherwise it wont modify. UPDATE - If record is available its update the record otherwise it creates a new record.
Trying to catch any runtime errors programmatically or manually we use this statement catch.
R/3trans is the R/3 system transport program which can be used for transporting data between different SAP systems ,even when they dont belong to the same group. R3trans normally is not used directorly but called from the Tp controle program or by the R/3 upgrade. Tp is the basic tool for the transporting the request.
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