Physiological redo logging can reduce logging overheads significantly, especially with a slotted page record organization. Explain why.
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Physiological redo logging can reduce logging overheads significantly, especially with a slotted page record organization. Explain why. |
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- What happens when a process tries to access a non-cached page? What steps comprise this procedure? Each action should be summarized in bullet points.How does "compensation logging" differ from traditional transaction logging?In the ARIES recovery algorithm: a. If at the beginning of the analysis pass, a page is not in the checkpoint dirty page table, will we need to apply any redo records to it? Why? b. What is RecLSN, and how is it used to minimize unnecessary redos?
- External fragmentation can be addressed using a technique known as___________, which is discussed in detail in QUESTION 5.Explain why each of the following protocols should or should not be used:• Multiversion timestamp ordering • Multiversion two-phase lockingHow does the "write-ahead logging" (WAL) mechanism ensure transaction durability?
- The amount of encryption operations required to transfer a big file is comparable in block chaining and feedback modes.By what percentage does one solution outperform another?Some database systems allow the administrator to choose between two forms of logging: normal logging, used to recover from system crashes, and archival logging, used to recover from media (disk) failure. When can a log record be deleted, in each of these cases, using the recovery algorithm of Section 19.4?How can write-ahead logging guarantee atomicity when a computer system malfunction is possible?