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When a race is run a number of tables need to update.
Results(EventID,CompID)Medals(EventID,Medal,CompID)medal is "Gold","Silver" or "Bronze"MedalTally(Country,Medal,Number)Competitors(CompID,Country)Medalists(CompID,NMedals)NMedals is total of medals for that Competitor
Suppose that when the event is completed at the venue giving CompID and position related with that EventID, then series of transactions are executed which update table shown.
a. for each table argue whether or not interference with another transaction is possible. Illustrate concurrency control method using two phase locking
b. Is there any situations in which DBMS would have to abort transaction?
Sketch an E-R diagram which reflects the above reuirements. Write a set of relational schemas and identify primary and foreign keys. Try not to include redundant schemas.
Can Oracle have multiple group functions in the same SELECT list of query (i.e can we do a COUNT and AVG)? Let us assume we wanted to find lowest, highest, average.
Draw Active Directory hierarchy in terms of forests, trees, domains, organizational units, and sites which are most suitable for this company and their security concerns.
A Relational schema of your database in 3NF, clearly indicating attributes, the data type of each attribute, primary and foreign keys, candidate keys, and which attributes are nullable, giving reasons. List any assumptions you need to make.
Draw an Entity Relationship diagram for the system and Identify the table design for the database displaying all the fields/attributes. Ensure that all tables are in 3NF. You also need to identify the primary keys and foreign keys, where applicable..
Describe the database and describe the four characteristics of the database? Explain the Relational Database and generate a relational database for five employees.
Examples for small n are given bellow, where a small square box represents an unsuccessful search. Prove that leaves of any binary search tree are located in the bottom two levels.
Several times, database triggers are utilized to record logins by users. Here is the example of login trigger that inserts row into table every time a user connects.
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?
A database at a college is required to support the following requirements. Complete the information-level design for this set of requirements. Determine any constraints you need that are not stated in the problem.
Create and run the following sql queries and submit the screen shot of your result. Also submit the file lab_06_03. sql
creating database structure using SQL
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