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1. What a query execution plan?
2. Discuss the reasons for converting SQL queries into relational algebra queries before optimization is done.
3. Explain the three factors that influence the cost of a query.
4. A file of 4096 blocks is to be sorted with an available buffer space of 64 blocks. How many passes will be needed in the merge phase of the external sort-merge algorithm?
5. In a particular transaction, the number of file blocks of data to be fetched is 6 while the size of entire file is 2048 blocks; evaluate the number of initial runs the transaction has to make.
6. How does a query tree represent a relational algebra expression? What is meant by an execution of a query tree? Discuss the rules for transformation of query tree, and identify when each rule should be applied during optimization.
7. Query optimization is a misnomer. Explain.
imagine that you have been hired as the database administrator for a local department store. the department store has
Identify the potential sales and department store transactions that can be stored within the database. Design a database solution and the potential business rules that could be used to house the sales transactions of the department store
Describe the basic mechanisms for accessing relational databases from various types of application development environments.
Per the text, the Database Life Cycle includes the Database Initial Study, Database Design, Implementation and Loading, Testing and Evaluation, Operation, and Maintenance and Evolution phases.
JDBC enables ____ applications to exchange data with any database that uses SQL statements and is compliant with the
Draw a UML class diagram that models the aspects of job agencies that are described below.
Describe in your own words and illustrate with tables how relationships are represented in a relational database?
Review the data analysis and consider the coding activities you have engaged. Consider the kinds of data that would be generated through the data collection techniques anticipated for your qualitative research plan.
Relational Algebra- The database used for this question is a very simple one with the following schema: (Primary keys are bold, foreign keys are underlined)
Create a class called TestSystem and write atest method which tests your system using a scenario. In your report document, describe the testing scenario and the expected behaviour of your system. Provide screen shots of your system testing in your..
Consider the EER diagram for a car dealer in the figure below. Map the EER schema into a set of relations. For the VEHICLE to CAR/ TRUCK/ SUV generalization.
part ause the prime minister database primeminister2013.sql available from the interact site. answer the following
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