DATABASE SYSTEM CONCEPTS LCPO
7th Edition
ISBN: 9781265586577
Author: SILBERSCHATZ
Publisher: MCG
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Chapter 19, Problem 10PE
Explanation of Solution
Dealing with the difficulty:
Recovery schemes are normally used for detecting failures and restoring the
It is more difficult to recover from interactive transactions than batch transactions because of the following reasons:
- Some actions in interactive transactions cannot be recovered.
- For example, consider a write statement used by an ATM machine to dispense money to a customer.
- One way to deal with such statements are by writing all the statements at the end of the transaction.
- Hence, no harm will be done even if the transaction aborts anywhere from the beginning to the end...
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1. Create an abstract Animal class. Then, create a Cat class. Please implement all the methods and inheritance
relations in the UML correctly:
Animal
name: String
# Animal (name: String)
+ getName(): String
+ setName(name: String): void
+ toString(): String
+ makeSound(): void
Cat
breed : String
age: int
+ Cat(name: String, breed: String, age: int)
+ getBreed(): String
+ getAge (): int
+ toString(): String
+ makeSound(): void
2. Create a public CatTest class with a main method. In the main method, create one Cat object and print the
object using System.out.println(). Then, test makeSound() method.
Your printing result must follow the example output:
name: Coco, breed: Domestic short-haired, age: 3
Meow Meow
automata theory can please wright the exact language it know for example say it knows strings start 0 and end with 1 this is as example also as regular expression
Chapter 19 Solutions
DATABASE SYSTEM CONCEPTS LCPO
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