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Chapter 19: Problem 1

Discuss the different types of transaction failures. What is meant by catastrophic failure?

Short Answer

Expert verified
Transaction failures are events that prevent a transaction from proceeding to completion, typically divided into system errors, system crashes, and local errors. Catastrophic failure is a type of system crash where the database management system itself fails completely, often resulting in significant data loss.

Step by step solution

01

Understanding Transaction Failures

Transaction failures refer to any event that prevents a transaction from proceeding to completion. These failures are typically divided into three categories: system errors, system crashes, and local errors. System errors are related to issues with the software or hardware, while system crashes refer to the entire database management system going down. Local errors refer to any error that occurs within a single transaction, such as a failure during the course of executing SQL queries.
02

Understanding Catastrophic Failure

A catastrophic failure is a type of system crash, where the database management system itself fails completely such as due to hardware or network failure. Catastrophic failures often result in significant data loss, and restoring the system to a functioning state may require significant time and resources.
03

Implication of Transaction Failures and Catastrophic Failure

In the event of a transaction failure, the current transaction is typically rolled back and retried. However in the case of a catastrophic failure, recovery processes would need to be performed to retrieve the data, including using backup data if available. This involves the application of various recovery techniques designed to preserve data integrity and consistency, such as the use of transaction logs and checkpointing.

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Most popular questions from this chapter

What do the terms steal/no-steal and force/no-force mean with regard to buffer management for transaction processing.

What are log sequence numbers (LSNs) in ARIES? How are they used? What information does the Dirty Page Table and Transaction Table contain? Describe how fuzzy checkpointing is used in ARIES.

Choose the correct answer for each of the following multiple-choice questions: If the shadowing approach is used for flushing a data item back to disk, then a. the item is written to disk only after the transaction commits. b. the item is written to a different location on disk. c. the item is written to disk before the transaction commits. d. the item is written to the same disk location from which it was read.

Describe the shadow paging recovery technique. Under what circumstances does it not require a log?

Choose the correct answer for each of the following multiple-choice questions: For incremental logging with immediate updates, a log record for a transaction would contain: a. a transaction name, data item name, old value of item, new value of item. b. a transaction name, data item name, old value of item. c. a transaction name, data item name, new value of item. d. a transaction name and a data item name.
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