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Suppose that we replace the wait and signal operations of monitors with a single construct await(B), where B is a general Boolean expression that causes the process executing it to wait until B becomes true.
a. Write a monitor using this scheme to implement the readers--writers problem.
b. Explain why, in general, this construct cannot be implemented efficiently.
c. What restrictions need to be put on the await statement so that it can be implemented efficiently? (Hint: Restrict the generality of B; see kessels [1977].)
What advantage is there in storing metadata in tables? Is Microsoft Access a DBMS? Why or why not? List the several consequences of a poorly designed database.
Data Modeling and Normalization
Suppose you have a table which contains 27,000 data records, and you have unclustered B+ Tree Index on the table.
What criteria would you use in selecting a life-cycle model for the project?
Explain how much the modulating signal power is required to generate 100 percent modulation? What is the approximate center frequency of filter required to pass the lower sideband?
Explain the differences between the storing data in Access and Excel. Why you would use a spreadsheet over the database?
Name four attributes that you can use to define a data flow in the bus information system. Name four attributes that you can use to define a data store in the bus information system.
Create tables in 3NF. As you create the database, include different codes for at least three of the fields. Use sample data to populate fields for at least three records in each table.
Carry out the following tasks below by using the correct SQL statements. Create the statements in Oracle by using the following steps (SQL > SQL commands > Enter Command). Determine the columns that make up the primary key of the l_lunch_items tabl..
Design an er schema for keeping track of information about votes taken in the U.S. House of Representatives during the current two year congressional session.
Write the following procedures: woman_wants_to_enter, man_wants_to_enter, woman_leaves, man_leaves, using counters and sychronisation techniques to ensure that the correct behaviour will occur.
You have just received a new computer at work. it runs fast and works great. thinking about the future and the day something might break explain why it is important to record this information.
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