ISQS Delgadillo Exam 3 TTU Questions And Answers Latest Updates
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Course
ISQS Delgadillo TTU
Institution
ISQS Delgadillo TTU
Database Administrator (DBA) - ️️-Responsible for managing the data, work with
programmers and systems analyst to design and implement database.
-Also work with users and managers of the firm to establish policies for managing.
File - ️️-(e.g. personnel file)
◦ Clooney, George 1-20-2...
Database Administrator (DBA) - ✔️✔️-Responsible for managing the data, work with
programmers and systems analyst to design and implement database.
-Also work with users and managers of the firm to establish policies for managing.
File - ✔️✔️-(e.g. personnel file)
◦ 098-40-1370 Clooney, George 1-20-2010
◦ 594-39-3948 Kidman, Nicole 3-24-2009
◦ 234-34-3483 Hanks, Tom 2-02-2009
◦ 457-74-3854 Winslet, Kate 1-23-2009
Why is there a demand for more and better data? - ✔️✔️-competitive environment.
-powerful workstations that can handle data quickly.
-more computer literate personnel.
Data Resource Management - ✔️✔️-when you use technology to mange data.
Equivalent of DBMS : Office - ✔️✔️Database: file cabinet
File: file drawer
Record: file folder
Record Attributes: Report
Hierarchy of data - ✔️✔️-Database
-Files
-Records
-Attributes
-Characters
-Bits
Database - ✔️✔️-Integrated collection of logically related data elements.
-Personnel File, Payroll File, Department File
Record - ✔️✔️-(Record containing SSN, Last and
First name, Hire date)
-594-41-3955 Bullock, Sandra 4-24-07
flat file - ✔️✔️-A table storing all database information in one large two-dimensional
table.
Traditional approach disadvantages - ✔️✔️- you have to change your address at every
place where everyone has their own file on you.
-Data are stored, organized and processed in independent files
-Data duplication- everyone has your address.
-Lack of integration- its impossible to combine two different databases or files.
-data dependence- when you change files you have to change program.
advantages of database approach - ✔️✔️-minimal data redundancy (data duplication
minimized)
data integration
-program-data independence (no data dependence)
hierarchal model - ✔️✔️• data is organized in a top-down (inverted tree) structure.
• Parent - child relationships
• one-to-many relationship (one parent, many children)
-problem with it is a parent can have many children but a child only has one parent.
(One to many relationship)
-One access path- one path to top and bottom element.
Network model - ✔️✔️-an extension of the hierarchical model.
-owner - member relationships
-Many to many relationships.
-a member may have several owners
-more than one path of access
-one major problem was once relationships were set it was very difficult to break them.
Relational model - ✔️✔️-most inefficient, but it's the most friendly.
-represented with tables.
-You connect the tables on common data elements. (Look at online notes)
-most widely used structure.
-data elements are viewed as being stored in tables.
-a row represents a record.
-Column's represent a field. EMP name EMP salary, things like that.
-can relate data in one file with data in another file if both files share a common data
element.
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