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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Chapter 19, Problem 3PE
Explanation of Solution
Deleting a log record with normal logging:
- With normal logging, all log records except the ones mentioned below can be deleted.
- All logs that are related to transactions, which were active during the most recent checkpoint.
- All logs that are related to transactions, which were started after the checkpoint.
- All the above-mentioned log records are needed for recovery purposes.
- More number of records can be deleted after each checkpoint, when multiple number of checkpoints are used.
- Thus, the system looks out for a point in the log records where all earlier log records before that point can be deleted and goes ahead with the deletion...
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