Suppose that in addition to the operations read and write, we allow an operationpred read(r, P), which reads all tuples in relation r that satisfy predicateP.a. Give an example of a schedule using the pred read operation that exhibitsthe phantom phenomenon and is nonserializable as a result.b. Give an example of a schedule where one transaction uses thepred read operation on relation r and another concurrent transactiondeletes a tuple from r, but the schedule does not exhibit a phantom conflict.(To do so, you have to give the schema of relation r and show theattribute values of the deleted tuple.)
Suppose that in addition to the operations read and write, we allow an operationpred read(r, P), which reads all tuples in relation r that satisfy predicateP.a. Give an example of a schedule using the pred read operation that exhibitsthe phantom phenomenon and is nonserializable as a result.b. Give an example of a schedule where one transaction uses thepred read operation on relation r and another concurrent transactiondeletes a tuple from r, but the schedule does not exhibit a phantom conflict.(To do so, you have to give the schema of relation r and show theattribute values of the deleted tuple.)
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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| Suppose that in addition to the operations read and write, we allow an operation pred read(r, P), which reads all tuples in relation r that satisfy predicate P. a. Give an example of a schedule using the pred read operation that exhibits the phantom phenomenon and is nonserializable as a result. b. Give an example of a schedule where one transaction uses the pred read operation on relation r and another concurrent transaction deletes a tuple from r, but the schedule does not exhibit a phantom conflict. (To do so, you have to give the schema of relation r and show the attribute values of the deleted tuple.) |
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