EBK DATABASE SYSTEM CONCEPTS
EBK DATABASE SYSTEM CONCEPTS
7th Edition
ISBN: 9781260049268
Author: SILBERSCHATZ
Publisher: MCG COURSE
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Chapter 18, Problem 10PE

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Practical applications of two-phase locking protocol

  • Two-phase locking protocol is used for simple applications where a single granularity is accepted...

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Practical applications of two-phase locking with multiple granularity locking protocol

  • It is used for applications where some applications access individual records and others access whole relations or substantial parts...

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Practical applications of tree protocol

  • It is used for all applications that tend to access data items in an order consistent with a particular partial order...

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Practical applications of timestamp ordering protocol

  • It is used if the application demands a concurrent execution that is equivalent to a particular serial ordering.
  • Conflicts are handled by roll-back of transactions rather than waiting and schedules are also not recoverable...

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Practical applications of validation protocol

  • If the probability of two conflict of two concurrently executing transaction is low, then this protocol can be used...

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Practical applications of multiversion timestamp ordering protocol

  • It is used it timestamp ordering is appropriate...

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Practical applications of multiversion multiversion two phase locking protocol

  • It allows read-only transactions to always commit without waiting.
  • Update transactions follow two phase locking protocol and allows recoverable schedules with conflicts solved by waiting rather than roll-back...

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Task 3. i) Compare your results from Tasks 1 and 2. j) Repeat Tasks 1 and 2 for 500 and 5,000 elements. k) Summarize run-time results in the following table: Time/size n String StringBuilder 50 500 5,000
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1. Create a Vehicle.java file. Implement the public Vehicle and Car classes in Vehicle.java, including all the variables and methods in the UMLS. Vehicle - make: String model: String -year: int + Vehicle(String make, String, model, int, year) + getMake(): String + setMake(String make): void + getModel(): String + setModel(String model): void + getYear(): int + set Year(int year): void +toString(): String Car - numDoors: int + numberOfCar: int + Car(String make, String, model, int, year, int numDoors) + getNumDoors(): int + setNumDoors (int num Doors): void + toString(): String 2. Create a CarTest.java file. Implement a public CarTest class with a main method. In the main method, create one Car object and print the object using System.out.println(). Then, print the numberOfCar. Your printing result must follow the example output: make Toyota, model=Camry, year=2022 numDoors=4 1 Hint: You need to modify the toString methods in the Car class and Vehicle class!
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