Compare the deferred- and immediate-modification versions of the log-based recovery scheme in terms of ease of implementation and overhead cost.
Answer to relevant QuestionsAssume that immediate modification is used in a system. Show, by an example, how an inconsistent database state could result if log records for a transaction are not output to stable storage prior to data updated by the ...Explain how the buffer manager may cause the database to become inconsistent if some log records pertaining to a block are not output to stable storage before the block is output to disk.Why is it relatively easy to port a database from a single processor machine to a multiprocessor machine if individual queries need not be parallelized?What are the factors that can work against linear scaleup in a transaction processing system? Which of the factors are likely to be themost important in each of the following architectures: shared memory, shared disk, and ...Consider a failure that occurs during 2PC for a transaction. For each possible failure that you listed in Exercise 19.6a, explain how 2PC ensures transaction atomicity despite the failure.
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