1) You are implementing a Relational Database for a company t that sells its pro
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Question
1) You are implementing a Relational Database for a company t that sells its products on internet. The Database maintains the Customer information in a table called “CUSTOMERS”. The primary key of this table is a column called “CustomerID”. There are also columns “LastName”, “FirstName” , “City” , and “ZipCode” representing last name, first name, city in which the Customer lives and the 5 digit zip code of the customer respectively. When a customer calls the customer service department with any inquiries, the customer service representative asks the customer for his or her Customer ID and pulls the information related to that customer from the Database. However, if a caller does not remember his/her Customer ID, the Customer service representative asks the customer for his/her last name and the 5 digit zip code, pulls the information related to all the customers from the database with matching last name & zip code combination and then further narrows down the search for the customer record based on some other identifiable information about the customer. The CUSTOMER table is expected to have millions of records and the system needs to quickly retrieve a set of matching customer records based on Customer’s last name and 5 digit zip code combinations.
As the Database Designer, how could you speed up the retrieval of data from the CUSTOMER table for a given combination of customer’s last name and zip code?
2) You are implementing a NoSQL database to record the grievances of customers of an automobile company. You have freedom of recommending a Key-Value type database or a Document Database. Each of the grievance record is keyed on Customer ID, and contains certain other information like the Automobile model (examples: Camry, Civic, Corolla, Escort….), grievance category (Example: Mileage/Fuel consumption, Maintenance costs, pickup time…), and some description of the grievance. The system needs an ability to index and query the grievance records based on values for Automobile model and grievance category.
As the Database Designer, would you recommend a Key-value type of database or a Document database? Please provide explanation(s) for your recommendation.
3) You are tasked with implementing a NoSQL database for a Social Network website. The website has a requirement to identify common friends/connections between given two members. You have freedom to recommend a key-value type database, Document database or a Graph database.
Which type of Database would you recommend for this type of application?
Explanation / Answer
1
select * from CUSTOMER where lastname = 'name' and pincode = 111111;
The above query will display all the record matching the last name and pincode.
2.
In terms of NOSQL datas are stores as key value pair. Set of key value pair is said to be as documents. Both key value and document database are similar that extended to store the records in the form of key and value.
3.
Graph database is efficient because graph database uses nodes and edges to store the records which represents all the records with a relationship. Using graph database will retrive records in single operation.
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