Database Management System · Unit 10 · 3 hrs
Database Recovery Techniques
Exam-focused notes for Database Recovery Techniques (Database Management System, CSC265): what the TU syllabus asks and how it has actually been tested, with 5 solved past questions from this unit.
What this unit covers
- Recovery Concepts
- NO-UNDO/REDO Recovery Based on Deferred Update
- Recovery Technique Based on Immediate Update
- Shadow Paging
- Database Backup and Recovery from Catastrophic Failures
Recovery Technique Based on Immediate Update
Why database recovery is essential? Explain recovery technique based on immediate update. [5]
Database recovery is essential due to the following reasons: - System Crashes and Failures: Hardware or software failures can occur in the middle of a transaction, leaving the database in an inconsistent state. - Transaction Errors: Incorrect command execut...
Full solved answer →Why database recovery is essential? Explain recovery technique based on immediate update. [5]
Database recovery is essential due to the following reasons: - System Crashes and Failures: Hardware or software failures can occur in the middle of a transaction, leaving the database in an inconsistent state. - Transaction Errors: Incorrect command execut...
Full solved answer →Recovery Concepts
What is Buffer Management in DBMS? Explain. [5]
Buffer Management refers to the process by which the DBMS manages a collection of in-memory buffers (called the DBMS cache) that temporarily hold disk pages (blocks) containing data items needed for processing. Since disk I/O is slow, the DBMS brings data i...
Full solved answer →What is Checkpoints in database recovery? How does it help in database recovery? Explain. [5]
A checkpoint is a special type of entry written to the transaction log that acts as a bookmark or synchronization point in the database system. It is a mechanism where all previous log records are permanently stored to disk, and the DBMS declares a point be...
Full solved answer →What are the different approaches of Database recover? What should log file maintain in log-based recovery? [5]
Database recovery techniques are methods used to restore the database to a correct consistent state after failures such as system crashes, transaction errors, viruses, or incorrect command execution. The main approaches are: --- A log (also called journal) ...
Full solved answer →Make Unit 10 stick
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