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Explain the thought process of DBA as they craete the database to be fault tolerant. What policies would you suggest to get this goal? Examine and explain the different factors which will affect their decision.
Determine airports with late flights to Toronto on a big plane. "Late" means departing after 9:00pm; "big" means with capacity 150 passengers or more
Create ERD containing Order and Customer entity types connected by 1-M relationship from Customer to Order. Select suiatble relationship name using your common knowledge of intersection.
Transform the tables into one or more tables in BCNF. State the primary keys, candidate keys, and referential integrity constraints.
How many entities are shown by this relation?
Complete following task. In each exercise, represent answer in both DBDL and with diagram. You may use any of styles for diagram. Create database to produce following reports. Do not use any surrogate keys in design.
Proceed with all steps in information-level design to add this user view to existing cumulative design. Is this table in1st NF?___No____ . If Yes skip. If not, write Table in DBDL notation after applying the methodology we use for converting into 1NF..
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.
List the different entities or objects, logical processes, data flows, and data stores that are involved, starting from the time you submitted your time sheet.
What rules would have to be enforced based on entity type? Choose one entity type and discuss what enforcement is needed by the database or application.
When increasing cardinalities from 1:N to N:M, which of the given steps are included in process the order of steps listed below is not relevant, only steps themselves?
What are triggers used for, and why are they significant in database systems? Give an example of situation where a trigger would be appropriate. What would implementation of this trigger look like?
Describe the entity-relationship model. How are entities, relationships, and attributes represented in this model? What is a composite entity? Describe the approach to diagrams that uses a crow's foot.
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