DATABASE SYSTEM CONCEPTS LCPO
7th Edition
ISBN: 9781265586577
Author: SILBERSCHATZ
Publisher: MCG
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Chapter 23, Problem 3PE
Explanation of Solution
2PC ensuring transaction atomicity:
- Consider two PC’s for which a failure occurs during the transmission of data, which can guarantee commit and abort instead of site and link failure.
- Only the coordinator of a transaction can perform commit and abort operations.
- This transaction can happen only on coordinator's decision either directly or indirectly from the site.
- Consider two cases, one for site aborting and other for site committing.
Case-1:
Under following circumstance, the transaction T can be aborted by using the message:
- If a log does not contain ready or commit message, then only the coordinator can make a decision to abort the transaction...
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