0
three levels of data abstraction
are:
1. Physical level : how the data is
stored physically and where it is
stored in
database.
2. Logical level : what information
or data is stored in the database
(like what is the
datatype or what is format of
data.
3.View level : end users work on
view level. if any amendment is
made it can be
saved by other name.
for the database to be usable it
must retrieve data efficently.this
efficency led designer to use
complex data structure in the
database
What else can I help you with?
Data granularity in a data warehouse?
Granularity refers to the level of detail of the data stored fact tables in a data warehouse. High granularity refers to data that is at or near the transaction level. Data that is at the transaction level is usually referred to as atomic level data. Low granularity refers to data that is summarized or aggregated, usually from the atomic level data. Summarized data can be lightly summarized as in daily or weekly summaries or highly summarized data such as yearly averages and totals.
What is high level data modelling?
Hi, High level Data modelling is the process of define and analyze the data requirement.
What is the lowest level of data in MySQL?
Data fields
What is Data level structure?
three levels of data abstraction are: 1. Physical level : how the data is stored physically and where it is stored in database. 2. Logical level : what information or data is stored in the database (like what is the datatype or what is format of data. 3.View level : end users work on view level. if any amendment is made it can be saved by other name. for the database to be usable it must retrieve data efficently.this efficency led designer to use complex data structure in the database
What is structural level?
three levels of data abstraction are: 1. Physical level : how the data is stored physically and where it is stored in database. 2. Logical level : what information or data is stored in the database (like what is the datatype or what is format of data. 3.View level : end users work on view level. if any amendment is made it can be saved by other name. for the database to be usable it must retrieve data efficently.this efficency led designer to use complex data structure in the database
Which level of Abstraction describes how data are stored in the data base?
how data are stored would be in a physical layer
Which level of abstraction defines the end user perception of data?
external level
Which level provides an abstract view of data and the operations that manipulate them?
implementation level
Elementary data link protocols?
Elementary data link protocols must agree at the most rudimentary level. The data frame must be constructed from this level, and all protocols must agree.
Which of these is not a level of the data storage hierarchy?
dictionary
The lowest level of abstraction which describes how the data are actually are stored is called?
The machine level.
What is a level 0 diagram?
A system diagram is known as a first level DFD (Level 0 DFD) A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system.
