OBA 340 Review Questions And Answers With Verified Solutions
0 view 0 purchase
Course
OBA 340
Institution
OBA 340
OBA 340 Review Questions And Answers With Verified Solutions
Describe the purpose of a database. ANS The purpose of a database is to help people keep track of things.
What is a modification problem? ANS A modification problem is a data corruption or loss that occurs when a table uses one row ...
OBA 340 Review Questions And Answers With
Verified Solutions
Describe the purpose of a database. ANS The purpose of a database is to help people keep track of things.
What is a modification problem? ANS A modification problem is a data corruption or loss that occurs when a
table uses one row to store facts about two or more themes. In this case, a deletion of a row can remove facts
about two or more themes, leading to a loss in data, or a data change must be made in multiple rows to maintain
data consistency. Finally, unless creation of a new row is allowed based on only one theme, it may be impossible to
store needed data.
What are the three possible types of modification problems? ANS The three possible modification problems
are: (1) insert problems—missing data, (2) update problems—inconsistent data, and (3) delete problems—data
loss.
What is an ID column? ANS An ID column is a column used to assign a unique identifying number to each row
of a table.
ANS
Describe in your own words and illustrate with tables how relationships are represented in a relational database.
ANS Relationships are represented by storing the key values of one table, such as PetID or OwnerPhone, in a
column in a second table to serve as a linking value. In the SERVICE table, for example, the value of PetID means
that the service was performed for that particular pet, which links to the PET table.
Name the four components of a database system. ANS User, database application, DBMS, database
Define the term database. ANS A self-describing collection of related tables (or records), where self-describing
means that the database contains a description of itself within itself.
Why do you think it is important for a database to be self-describing? ANS It is important for a database to be
self-describing so that there is always a way to know the database's structure and contents. Without the self-
description, it would not be possible to know what's in the database.
List the components of a database. ANS Components are: User data, metadata, indexes and other overhead
data, application metadata.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Labtech. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
