Database System Concepts
7th Edition
ISBN: 9781260084504
Author: Abraham Silberschatz, S. Sudarshan, Abraham, Henry Korth, Silberschatz Abraham, Silberschatz Professor
Publisher: McGraw-Hill Education
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Expert Solution & Answer
Chapter 19, Problem 5PE
Explanation of Solution
a.
Requirement of old-value part of an update log record:
- When deferred modification scheme is used, almost all write operations associated with a transaction are deferred till it commits.
- When deferred modification technique is used, the old value part of an update log record is not required a...
Explanation of Solution
b.
Modifying the redo-phase of recovery:
With the given modifications, the redo-phase have to be modified as given below:
-
...
Explanation of Solution
c.
Implementing a data item read:
To implement a data item read in the given case efficiently;
- First a read request is issued on the local memory of the transaction...
Explanation of Solution
d.
Problem arisen with the given technique:
When a single transaction performs a large number of ...
Expert Solution & Answer
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