Copyright © 2004 Pearson Education, Inc.

Chapter 17 Introduction to Transaction Processing Concepts and Theory

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

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

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

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

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

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

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