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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.
Draw an EER model for the requirements identified in Part 1. The EER Model should be accompanied with a data dictionary which includes entity type table, relationship type table and attribute table.
Create an XML file with markup tags and some sample data to represent a list of invoices. Include the XML tags for two invoices in the list. Also, assume the invoices are created from a database whose tables are shown in the following database re..
Case Study based on an Interview contained in a separate document (Please see the details in page 221 of your text book). Carefully read this case study. You are required to answer the following questions based on the Case Study.
Show all attributes and include relationship and connectivity. Convert all M:N relationships into entities. You are to use Crow's Foot notation showing all attributes for each entity and naming each relationship. Do not show M:N relationship, convert..
A database is a very important system in many organizations. Describe the steps that are needed to pick a proper DBMS
List and describe three main capabilities or tools of a DBMS. Describe the effect of cloud computing on traditional IT infrastructure
Create a table (by your own imagination) which comprises the least 25 patients with next information (columns): Calculate average of Value1 for each Gender.
Draw the corresponding GRD, exhibiting all the primary keys and foreign keys. For simplicity, no other attributes nor multiplicity constraints are required.
Create a Microsoft Word table that identifies the advantages, disadvantages, computer requirements, initial costs, and future savings for an organization considering an engagement in virtualization.
Draw an functional decomposition diagram that shows the main operations described in the fact statement - prepare a context diagram and diagram 0 DFD for the new system.
Describe the basic mechanisms for accessing relational databases from various types of application development environments.
Develop an E/R diagram to represent the conceptual database scheme for the CSRSS and list the information of all doctors who are specialized is heart surgery.
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