Suppose a transaction deletes a record, and the free space generated thus isallocated to a record inserted by another transaction, even before the first transaction commits.a. What problem can occur if the first transaction needs to be rolled back?b. Would this problem be an issue if page-level locking is used instead oftuple-level locking?c. Suggest how to solve this problem while supporting tuple-level locking,by logging post-commit actions in special log records, and executing them after commit. Make sure your scheme ensures that such actions are performed exactly once.
Suppose a transaction deletes a record, and the free space generated thus isallocated to a record inserted by another transaction, even before the first transaction commits.a. What problem can occur if the first transaction needs to be rolled back?b. Would this problem be an issue if page-level locking is used instead oftuple-level locking?c. Suggest how to solve this problem while supporting tuple-level locking,by logging post-commit actions in special log records, and executing them after commit. Make sure your scheme ensures that such actions are performed exactly once.
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 a transaction deletes a record, and the free space generated thus is
allocated to a record inserted by another transaction, even before the first transaction commits.
a. What problem can occur if the first transaction needs to be rolled back?
b. Would this problem be an issue if page-level locking is used instead of
tuple-level locking?
c. Suggest how to solve this problem while supporting tuple-level locking,
by logging post-commit actions in special log records, and executing them after commit. Make sure your scheme ensures that such actions
are performed exactly once.
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