TAILIEUCHUNG - Database Management Systems: Chapter 5 - Concurrency Control Techniques

Database Management Systems: Chapter 5 - Concurrency Control Techniques provides about Databases Concurrency Control (Purpose of Concurrency Control, Two-Phase locking, Concurrency control based on Timestamp ordering, Multiversion Concurrency Control techniques, Lock Compatibility Matrix, Lock Granularity). | Chapter 5 Concurrency Control Techniques Adapted from the slides of “Fundamentals of Database Systems” (Elmasri et al., 2003) Outline Databases Concurrency Control 1 Purpose of Concurrency Control 2 Two-Phase locking 3 Concurrency control based on Timestamp ordering 4 Multiversion Concurrency Control techniques 5 Lock Compatibility Matrix 6 Lock Granularity Database Concurrency Control 1 Purpose of Concurrency Control To enforce Isolation (through mutual exclusion) among conflicting transactions. To preserve database consistency through consistency preserving execution of transactions. To resolve read-write and write-write conflicts. Example: In concurrent execution environment if T1 conflicts with T2 over a data item A, then the existing concurrency control decides if T1 or T2 should get the A and if the other transaction is rolled-back or waits. Database Concurrency Control Two-Phase Locking Techniques Locking is an operation which secures (a) permission to Read or (b) .

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• Database Management Systems
• Concurrency Control Techniques
• Databases Concurrency Control
• Purpose of Concurrency Control
• Two Phase locking
• Concurrency control based on Timestamp ordering
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