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Transaction Processing: Recoverability of Schedules Quiz

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Transaction Processing: Recoverability of Schedules Quiz

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Questions and Answers

What is the main purpose of serializability in DBMS?

To identify nonserial schedules that are incorrect
To identify nonserial schedules that are correct and maintain database consistency (correct)
To increase the number of serial schedules
To ensure interleaving of transactions

In the context of transaction processing, what is a serializable schedule?

A schedule where transactions occur concurrently
A non-serial schedule that maintains database consistency
A schedule that violates database consistency
A schedule where all transactions occur sequentially (correct)

What does a serial schedule guarantee in terms of transaction execution?

Random execution of transactions
Sequential execution of transactions (correct)
Concurrent execution of transactions
No execution of transactions

How is a non-serial schedule classified based on serializability?

Into serializable and non-serializable schedules (B) Signup and view all the answers

In what scenario is a non-serial schedule considered serializable?

When it is equivalent to the serial schedule of the same transactions (B) Signup and view all the answers

What characteristic distinguishes a serializable schedule from a non-serializable one?

The order of transaction execution (C) Signup and view all the answers

How does a serial schedule ensure database consistency?

By only starting a transaction when the previous one has finished (D) Signup and view all the answers

What is an invalid scenario for a nonrecoverable schedule?

A schedule where a transaction reads a value written by an uncommitted transaction (B) Signup and view all the answers

What is the key characteristic of a recoverable schedule?

It does not allow for dirty reads (C) Signup and view all the answers

How does a precedence graph help in identifying conflicts between transactions?

By showing dependencies between transactions (C) Signup and view all the answers