Why must lock and unlock be atomic operations

Assignment Help Basic Computer Science

Reference no: EM131210702

1. Define these terms: conflict-serializable schedule, view-serializable schedule, strict schedule

2. Describe each of the following locking protocols: 2PL, Conservative 2PL.

3. Why must lock and unlock be atomic operations?

4. What is the phantom problem? Can it occur in a database where the set of database objects is fixed and only the values of objects can be changed?

5. Identify one difference in the timestamps assigned to restarted transactions when timestamps are used for deadlock prevention versus when timestamps are used for concurrency control.

6. State and justify the Thomas Write Rule.

Reference no: EM131210702

Questions Cloud

What is done during redo : What is done during Analysis? (Be precise about the points at which Analysis begins and ends and describe the contents of any tables constructed in this phase.)

Shows the inclusions between the classes of schedules : Draw a Venn diagram that shows the inclusions between the classes of schedules permitted by the following concurrency control protocols: 2PL, Strict 2PL, Conservative 2PL, Optimistic, Timestamp without the Thomas Write Rule, Timestamp with the Tho..

Should ln manufacturing replace the old machine : LN Manufacturing uses straight-line depreciation. Ignore the time value of money and income taxes. - Should LN Manufacturing replace the old machine?

Determine the nusselt number for fully developed flow : Determine the Nusselt number for fully developed flow and temperature profile in a plane duct (i.e. between two large parallel plates; see Fig. P5.2) for the case of the same constant wall heat flux in both walls

Why must lock and unlock be atomic operations : What is the phantom problem? Can it occur in a database where the set of database objects is fixed and only the values of objects can be changed?

What is the value of the lsn stored in the master log record : Consider the execution shown in Figure 20.8. In addition, the system crashes during recovery after writing two log records to stable storage and again after writing another two log records.

How is checkpointing done in aries : Give an example that illustrates how the paradigm of repeating history and the use of CLRs allow ARIES to support locks of finer granularity than a page.

What would be the effect of a slowdown : Economics of Sustainability - What about environmental goods? Give an example of high and low elasticity and What would be the effect of a slowdown in Chinese economic growth? Would price increase or decrease? Would quantity increase or decrease?

Prepare a vertical common size analysis for 2010 and 2009 : Using the balance sheets, prepare a vertical common-size analysis for 2010 and 2009. Use total assets as a base.

User Account

All Pages