What is the force policy in database buffer management?
Understand the Problem
The question is asking about the 'force policy' in the context of database buffer management, specifically how modified blocks are handled in relation to transactions committing. It's looking for an explanation of a specific method of managing changes and ensuring data integrity during transactions.
Answer
The force policy requires transaction updates to be written to disk before committing.
The force policy in database buffer management requires that all updates made by a transaction be written to non-volatile storage before the transaction is allowed to commit.
Answer for screen readers
The force policy in database buffer management requires that all updates made by a transaction be written to non-volatile storage before the transaction is allowed to commit.
More Information
The force policy ensures data durability by writing changes to disk immediately, which aids recovery. However, this can lead to poor runtime performance due to the additional I/O operations involved.
Tips
A common mistake is to assume force policy enhances performance, whereas it actually can degrade runtime efficiency due to constant disk writes.
Sources
- What is the Force Policy in Database Buffer Management? - 15445.courses.cs.cmu.edu
- Difference between Steal/No-Steal and Force/No-Force policies - stackoverflow.com
- Recovery | Database Systems - CS 186 - cs186berkeley.net
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