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You are creating a database of measured meteorological data for use in weather and climate research. Explain a structure type measured_data_t with components site_id_num (a four digit integer), wind_speed, day_of_month, and temperature, Each site measures its data daily, at noon local time. Write down C program which inputs file of measured_data_t records and finds out site with greatest variation in temperature (defined here as biggest difference between extrema) and site with highest average wind speed for all days in file. You may suppose that there will be at most ten sites. Test program on the following July daily data gathered over one week at three sites.
id day wind speed temperature2001 10 11 302001 11
Suppose you are asked to evaluate a DBMS in terms of lock granularity and the different locking levels. Create a simple database environment in which these features would be important.
What is meant by a weak relationship? Provide an example. What is meant by weak entity? What do you understand by relationship degree?
Developers have noticed that EMP table doesn't have an assigned primary key. EMP_ID column has been selected to be the primary key.
Write the name(s) of employee(s) who works(work) on every project located in Houston. Write the name(s) of employee(s) who only works(work) on every project located in 'Houston.'
What about giving same name to attributes which are in different tables but are not same? For instance, "Description" in both a Course table and a Classroom table.
All primary keys are underlined. All foreign keys have same name as primary key that they are referencing. Determine the names of all Tracks which are more than 10 minutes (600,000 ms) long.
A small business with 100 computer workstations is installing a new local area network. All of the users perform the usual operations of e-mail. State your reasoning. Draw a floor plan for each If possible, show both floor plans on one page.
Mark the following words in the document as index entries: behavior (four instances), favorable (five instances), and impression (eight instances).
What is the maximum rate at which data can be read from disk, assuming that we can only read data from one surface at a time? What is the average rotational latency?
Use the three-sphere model for systems management and brainstorm issues related to the change based on the business, technology, and organization spheres.
Give examples of binary 1:N relationships, for (a) an optional-to-optional relationship, (b) an optional-to-mandatory relationship,
Describe the database and describe the four characteristics of the database? Explain the Relational Database and generate a relational database for five employees.
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