Exam (elaborations)
Data Management Foundations Study Guide C175 Exam Questions and Complete Solutions Graded A+
- Course
- Institution
Data Management Foundations Study Guide C175 Exam Questions and Complete Solutions Graded A+
[Show more]
Content preview
Data ManagementFoundations Study Guide
C175 Exam Questions
and Complete Solutions
Graded A+
Denning [Date] [Course title]
, Why databases? - Answer: ·Helps organizations use data / information as a resource to make decisions
File based structure (Prior to BDMS) - Answer: o Attempt to computerize old manual filing system
o Was easy to retrieve small amounts of information from
o As data grew, it became difficult to locate and retrieve information
o Retrieval speed depended on file structure and how data was organized within the structure
File types that utilized file based structure - Answer: Flat files, heap files, Index files, hashed files
Flat files - Answer: no internal hierarchy and data is unstructured
Heap files - Answer: unsorted set of records uniquely identified by record ID
-allows heap files to be inserted or deleted using ID
index files - Answer: · File that stores a list of Look Up Field values from data file that includes the
location (address) in the data file of the corresponding record
· Smaller than the entire record, usually fits in main memory for quick look up
· Lists keywords and phrases that are in a particular file
· Becomes a pointer to the location in the file where the information can be found when stored with
keywords and phrases
hashed files - Answer: · Uses hash functions to decide where records should be placed on a disk
· Allows for faster data look up without the use of an index file
data - Answer: raw facts not processed to reveal meaning. Requires transformation to better
understand.
information - Answer: o Produced by Processing Raw Data to reveal its meaning
o Key to good decision making and business survival is accurate, relevant, and timely information
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 YourExamplug. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now
