1. Copyright © 2004 Pearson Education, Inc.

2. Chapter 17 Introduction to Transaction Processing Concepts and Theory

3. Elmasri and Navathe, Fundamentals of Database Systems, Fourth Edition Copyright © 2004 Pearson Education, Inc. Slide 17-3 Introduction to Transaction Processing Single-User Versus Multiuser Systems Transactions, Read and Write Operations, and DBMS Buffers Why Concurrency Control Is Needed Why Recovery Is Needed

4. Elmasri and Navathe, Fundamentals of Database Systems, Fourth Edition Copyright © 2004 Pearson Education, Inc. Slide 17-4 Transaction and System Concepts Transaction States and Additional Operations The System Log Commet Point of a Transaction

5. Elmasri and Navathe, Fundamentals of Database Systems, Fourth Edition Copyright © 2004 Pearson Education, Inc. Slide 17-5 Desirable Properties of Transactions

6. Elmasri and Navathe, Fundamentals of Database Systems, Fourth Edition Copyright © 2004 Pearson Education, Inc. Slide 17-6 Characterizing Schedules Based on Recoverability Schedules (Histories) of Transactions Characterizing Schedules Base on Recoverability

7. Elmasri and Navathe, Fundamentals of Database Systems, Fourth Edition Copyright © 2004 Pearson Education, Inc. Slide 17-7 Characterizing Schedules Based on Serializability Serial, Nonserial, and Conflict-Serializable Schedules Testing for Conflict Serializability of a Schedule Uses of Serializability View Equivalence and View Serializability Other Types of Equivalence of Schedules

8. Elmasri and Navathe, Fundamentals of Database Systems, Fourth Edition Copyright © 2004 Pearson Education, Inc. Slide 17-8 Transaction Support in SQL

9. Elmasri and Navathe, Fundamentals of Database Systems, Fourth Edition Copyright © 2004 Pearson Education, Inc. Slide 17-9 Summary