a0093 oracle database 11g administration workshop i vol i morebook vn 1024

Oracle Database 11g:
Administration Workshop I
Volume 2 - Student Guide

D50102GC10
Edition 1.0
September 2007
D52684 L$

®


Authors

Copyright © 2007, Oracle. All rights reserved.

Priya Vennapusa

Disclaimer

James Spiller

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Managing Undo Data

Copyright © 2007, Oracle. All rights reserved.

Objectives

After completing this lesson, you should be able to:
• Explain DML and undo data generation
• Monitor and administer undo data
• Describe the difference between undo data and redo
data
• Configure undo retention
• Guarantee undo retention
• Use the Undo Advisor

10 - 2

Copyright © 2007, Oracle. All rights reserved.

Oracle Database 11g: Administration Workshop I 10 - 2


Data Manipulation

• Data manipulation language (DML) consists of the
following SQL statements:
–
–
–
–

INSERT
UPDATE

DELETE
MERGE

• DML always executes as part of a transaction, which
can be:
– Rolled back using the ROLLBACK command
– Committed using the COMMIT command

10 - 3

Copyright © 2007, Oracle. All rights reserved.

Data Manipulation
Data is manipulated, or modified, by the DML class of SQL statements: INSERT, UPDATE,
DELETE, and MERGE. These statements execute as part of a transaction, which starts with the
first successful DML statement and ends with either a COMMIT or ROLLBACK command.
A transaction is either entirely committed or entirely rolled back.
In addition to the explicit COMMIT or ROLLBACK commands, they can also occur implicitly.
For example, rollback may occur if there is a process or system failure. Commit may occur
after a DDL command, such as the CREATE TABLE command.
Note: The MERGE command performs a combination of DML commands to merge data from
one table into another. It is covered in the lesson titled “Managing Data and Concurrency.”

Oracle Database 11g: Administration Workshop I 10 - 3


Thank You!

We hope your experience with Oracle University has been
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• Oracle Education Services
We hope to see you in class again soon.

E - 15

Copyright © 2007, Oracle. All rights reserved.

Thank You!
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Thanks again and hope to see you in another class!

Oracle Database 11g: Administration Workshop I E - 15