Recovery System
Mastering Recovery Systems: A Quiz
Test your knowledge on recovery systems in database management with this engaging quiz! It covers essential concepts like atomicity, durability, logging mechanisms, and recovery procedures. Whether you're a student, a professional, or just curious, this quiz will enhance your understanding of critical database principles.
What you'll encounter:
- Multiple-choice questions
- Key scenarios related to recovery systems
- Conceptual challenges to test your knowledge
Recovery system essentially tries to maintain :
Atomicity
Durability
Above Both Properties
None of the above
Logs maintain on stable storage
True
False
Log based-deferred database modification also called as undo/redo recovery scheme
True
False
In immediate database modification,
Redo must be performed first and then undo
Undo must be performed first and then redo
Random order of undo or redo
None of the above answers
Consider the following log sequence of two transactions on a bank account, with initial balance 12000, that transfer 2000 to a mortgage payment and then apply a 5% interest. 1. T1 start 2. T1 B old=12000 new=10000 3. T1 M old=0 new=2000 4. T1 commit 5. T2 start 6. T2 B old=10000 new=10500 7. T2 commit Suppose the database system crashes just before log record 7 is written. When the system is restarted, which one statement is true of the recovery procedure?
Redo log record 6 to set B to 10500
Undo log record 6 to set B to 10000 and then redo log records 2 and 3
Not redo log records 2 and 3 because transaction T1 has committed
Apply redo and undo operations in arbitrary order because they are idempotent
If checkpoints are used,
No need to check log records before checkpoint
No need to check log records after checkpoint
Need to check complete log records
None of the above answer is correct
In shadow paging, changes due to transaction operation execution are updated in current table and shadow page table has effect of committed transactions only.
True
False
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