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Chapter 19: Problem 4

How are buffering and caching techniques used by the recovery subsystem?

Short Answer

Expert verified
Buffering in a recovery subsystem is used to hold data temporarily during a transmission process, improving system performance. Caching enhances the recovery process by storing frequently accessed data in quick-to-access hardware, thereby reducing data access and retrieval time.

Step by step solution

01

Introduction to buffering and caching

Buffering and caching are both temporary storage areas, but they differ in their functionality. Buffering is used for smoothing out input and output with disks whereas caching is geared towards reusing once-read data. Caching is a process that stores copies of data from original resource locations to fast-access hardware so that future requests for that data are served up faster than is possible from the resource.
02

How buffering is used by the recovery subsystem?

The recovery subsystem uses buffering as a means of temporary storage. This buffering system holds the data that is being transmitted from one location to another, acting as a holding area until the operation completes. This allows the system to handle large data transmissions without any bottlenecks or system slow-downs.
03

How caching is used by the recovery subsystem?

Caching helps the recovery subsystem by storing frequently accessed data in fast-access hardware. The cache stores copies of data from earlier requests, so when that same data needs to be accessed again, it can be quickly retrieved from the cache, which reduces the time needed to access it from the original location. It helps to improve the recovery speed and reduce the recovery time when the same data sets are frequently accessed.
04

Conclusion

In conclusion, the recovery subsystem uses both buffering and caching techniques to enhance the recovery process. Buffering helps handle larger data transmissions smoothly and efficiently, and caching helps speed up data access and recovery by storing copies of frequently accessed data in fast-access hardware.

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Most popular questions from this chapter

Discuss the immediate update recovery technique in both single-user and multi user environments. What are the advantages and disadvantages of immediate update?

Describe the two-phase commit protocol for multidatabase transactions.

Choose the correct answer for each of the following multiple-choice questions: To cope with media (disk) failures, it is necessary a. for the DBMS to only execute transactions in a single user environment. b. to keep a redundant copy of the database. c. to never abort a transaction. d. all of the above.

What is the difference between the UNDO/REDO and the UNDO/NO-REDO algorithms for recovery with immediate update? Develop the outline for an UNDO/NOREDO algorithm.

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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