Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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■CONTENTS v Block Buffer Cache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 Shared Pool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 Large Pool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Java Pool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151 Streams Pool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 Automatic SGA Memory Management . . . . . . . . . . . . . . . . . . . . . . . 152 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154 ■CHAPTER 5 Oracle Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155 Server Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 Dedicated Server Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 Shared Server Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158 Connections vs. Sessions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 Dedicated Server vs. Shared Server . . . . . . . . . . . . . . . . . . . . . . . . . 165 Dedicated/Shared Server Wrap-Up . . . . . . . . . . . . . . . . . . . . . . . . . . 169 Background Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170 Focused Background Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Utility Background Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 Slave Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181 I/O Slaves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181 Parallel Query Slaves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182 ■CHAPTER 6 Locking and Latching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183 What Are Locks? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183 Locking Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 Lost Updates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 Pessimistic Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187 Optimistic Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189 Optimistic or Pessimistic Locking? . . . . . . . . . . . . . . . . . . . . . . . . . . 200 Blocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 Deadlocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203 Lock Escalation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208 Lock Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209 DML Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209 DDL Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217 Latches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220 Manual Locking and User-Defined Locks . . . . . . . . . . . . . . . . . . . . . 229 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
vi ■CONTENTS ■CHAPTER 7 Concurrency and Multi-Versioning . . . . . . . . . . . . . . . . . . . . . . . 231 What Are Concurrency Controls? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231 Transaction Isolation Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232 READ UNCOMMITTED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234 READ COMMITTED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235 REPEATABLE READ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237 SERIALIZABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239 READ ONLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241 Implications of Multi-Version Read Consistency . . . . . . . . . . . . . . . . . . . . 242 A Common Data Warehousing Technique That Fails . . . . . . . . . . . 242 An Explanation for Higher Than Expected I/O on Hot Tables . . . . . 244 Write Consistency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246 Consistent Reads and Current Reads . . . . . . . . . . . . . . . . . . . . . . . . 247 Seeing a Restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249 Why Is a Restart Important to Us? . . . . . . . . . . . . . . . . . . . . . . . . . . . 252 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253 ■CHAPTER 8 Transactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255 Transaction Control Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256 Atomicity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257 Statement-Level Atomicity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257 Procedure-Level Atomicity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259 Transaction-Level Atomicity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262 Integrity Constraints and Transactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262 IMMEDIATE Constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262 DEFERRABLE Constraints and Cascading Updates . . . . . . . . . . . . . 263 Bad Transaction Habits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265 Committing in a Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266 Using Autocommit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272 Distributed Transactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273 Autonomous Transactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275 How Autonomous Transactions Work . . . . . . . . . . . . . . . . . . . . . . . . 275 When to Use Autonomous Transactions . . . . . . . . . . . . . . . . . . . . . . 277 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
Page 2 and 3: Expert Oracle Database Architecture
Page 4 and 5: Contents Foreword . . . . . . . . .
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Page 16 and 17: About the Technical Reviewers ■JO
Page 18 and 19: Introduction The inspiration for th
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Page 26 and 27: Setting Up Your Environment In this
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