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Chapter 16: Concurrency Control ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Lock-Based Protocols ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Lock-Based Protocols (Cont.) ,[object Object],[object Object],[object Object],[object Object]
Lock-Based Protocols (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Pitfalls of Lock-Based Protocols ,[object Object],[object Object],[object Object],[object Object]
Pitfalls of Lock-Based Protocols (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]
The Two-Phase Locking Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The Two-Phase Locking Protocol (Cont.) ,[object Object],[object Object],[object Object]
The Two-Phase Locking Protocol (Cont.) ,[object Object],[object Object],[object Object]
Lock Conversions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Automatic Acquisition of Locks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Automatic Acquisition of Locks (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Implementation of Locking ,[object Object],[object Object],[object Object],[object Object],[object Object]
Lock Table ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Graph-Based Protocols ,[object Object],[object Object],[object Object],[object Object],[object Object]
Tree Protocol ,[object Object],[object Object],[object Object]
Graph-Based Protocols (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Timestamp-Based Protocols ,[object Object],[object Object],[object Object],[object Object],[object Object]
Timestamp-Based Protocols (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Timestamp-Based Protocols (Cont.) ,[object Object],[object Object],[object Object],[object Object]
Example Use of the Protocol ,[object Object],[object Object],T 1 T 2 T 3 T 4 T 5 read( Y ) read( X )  read( Y ) write( Y )  write( Z )  read( Z )  read( X )  abort  read( X )  write( Z )  abort  write( Y )  write( Z )
Correctness of Timestamp-Ordering Protocol ,[object Object],[object Object],[object Object],[object Object],transaction with smaller timestamp transaction with larger timestamp
Recoverability and Cascade Freedom ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Thomas’ Write Rule ,[object Object],[object Object],[object Object],[object Object]
Validation-Based Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Validation-Based Protocol (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Validation Test for Transaction  T j ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Schedule Produced by Validation ,[object Object],T 14 T 15 read ( B ) read ( B ) B:- B-50 read ( A ) A:- A+50 read ( A ) ( validate ) display  ( A + B ) ( validate ) write  ( B ) write  ( A )
Multiple Granularity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example of Granularity Hierarchy ,[object Object],[object Object]
Intention Lock Modes ,[object Object],[object Object],[object Object],[object Object],[object Object]
Compatibility Matrix with  Intention Lock Modes ,[object Object],IS IX S S IX X  IS IX S S IX X                          
Multiple Granularity Locking Scheme ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Multiversion Schemes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Multiversion Timestamp Ordering ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Multiversion Timestamp Ordering (Cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Multiversion Two-Phase Locking ,[object Object],[object Object],[object Object],[object Object],[object Object]
Multiversion Two-Phase Locking (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Deadlock Handling ,[object Object],[object Object],[object Object],[object Object],T 1 T 2 lock-X  on  X write ( X )  lock-X  on  Y write ( X )  wait for  lock-X  on  X wait for  lock-X  on  Y
Deadlock Handling ,[object Object],[object Object],[object Object],[object Object]
More Deadlock Prevention Strategies ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Deadlock prevention (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Deadlock Detection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Deadlock Detection (Cont.) Wait-for graph without a cycle Wait-for graph with a cycle
Deadlock Recovery ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Insert and Delete Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Insert  and Delete Operations (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Index Locking Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object]
Weak Levels of Consistency ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Weak Levels of Consistency in SQL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Concurrency in Index Structures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Concurrency in Index Structures (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
End of Chapter
Partial Schedule Under Two-Phase Locking
Incomplete Schedule With a Lock Conversion
Lock Table
Tree-Structured Database Graph
Serializable Schedule Under the Tree Protocol
Schedule 3
Schedule 4
Schedule 5, A Schedule Produced by Using Validation
Granularity Hierarchy
Compatibility Matrix
Wait-for Graph With No Cycle
Wait-for-graph With A Cycle
Nonserializable Schedule with Degree-Two Consistency
B + -Tree For  account  File with  n   = 3.
Insertion of “Clearview” Into the B + -Tree of Figure 16.21
Lock-Compatibility Matrix

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