Database System Concepts
7th Edition
ISBN: 9789332901384
Author: Henry F. Korth & S. Sudarshan Abraham Silberschatz
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 18, Problem 25E
a.
Explanation of Solution
Lock for reading a lot of tuples from relation r
- The entire logical databases may be composed of databases of multiple users which contains each user
database of multiple relations and each relation of multiple tuples...
b.
Explanation of Solution
Lock for updating a lot of tuples from relation r
- If two locks IS and IX are compatible, then two IX locks and two IS locks will be compatible automatically.
- This is because it is natural to allow the both transactions T1 and T2 to IS lock or IX lock for reading or updating different data items...
c.
Explanation of Solution
Problems caused to the lock table while updating a large number of tuples
- When a transaction finds that a large number of tuples need to be updated actually at the run time, then owner can decide to do delayed batch processing of updates.
- Large number of updates at run time affect the similar set of nodes.
- Large number of updates is expected to have a very expensive updating cost.
- A large number of tuple updating policy performs an unnecessary number of hash functions in its predecessor path.
- The data in a database can be wrong due to a lost update that can lead to problems with normal operations.
- One method for preventing lost update is to use optimistic concurrency control to perform optimistic locking on the data...
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Chapter 18 Solutions
Database System Concepts
Ch. 18 - Prob. 1PECh. 18 - Prob. 2PECh. 18 - Prob. 3PECh. 18 - Prob. 4PECh. 18 - Prob. 5PECh. 18 - Prob. 6PECh. 18 - Prob. 7PECh. 18 - Prob. 8PECh. 18 - Prob. 9PECh. 18 - Prob. 10PE
Ch. 18 - Prob. 11PECh. 18 - Prob. 12PECh. 18 - Prob. 13PECh. 18 - Prob. 14PECh. 18 - Prob. 17ECh. 18 - Prob. 18ECh. 18 - Prob. 19ECh. 18 - Prob. 20ECh. 18 - Prob. 21ECh. 18 - Prob. 22ECh. 18 - Prob. 23ECh. 18 - Prob. 24ECh. 18 - Prob. 25ECh. 18 - Prob. 26ECh. 18 - Prob. 27ECh. 18 - Prob. 28ECh. 18 - Prob. 29ECh. 18 - Prob. 30ECh. 18 - Prob. 31ECh. 18 - Prob. 32ECh. 18 - Prob. 33ECh. 18 - Prob. 34ECh. 18 - Prob. 35ECh. 18 - Prob. 36E
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