What is the impact of Data Modeling Software Engineering?
Latest Answer: GUI Representation of a Data model of any system helps in understanding the data flow and relationship between the entities. ...
What are Conceptual Mdels
Latest Answer: The only difference is in what's been selected in the model type when the
diagram was first started.
In ERWin 7.3 you have the choice of creating three different kinds of
diagrams:
1) Physical,
2) Logical;
3) Physical/Logical.
In order to ...
Latest Answer: Unlike OLTP, the goal of dimensional and fact modeling is not to achieve the highest Normal Form but rather to make key performance indicators (often sought after measures) readily accessible to ad-doc query. That being said, Dimensions can strive ...
ie. whether it should be Star schema or snow flake schema?
Latest Answer: Pro Star Schema:
Users find easier to query and faster query times.
Space consequences of repeated data makes little difference as Dimensional
table hold relatively fewer rows then the large Fact tables.
Pro Snowflake Schema:
DBA ...
What are the different Data Modeling software tools? Which one is considered the best among all in terms of cost, efficiency and usability ?
Latest Answer: ERWin is the industry leader. ...
Manages's salary details are hidden from employees This is 1. conceptual level of data hiding 2. physical level of data hiding 3. external level of data hiding 4. either 1 or 2
Match the following in the context of data flow diagram : i. circle a. source of data ii. square b. file or data base iii. arrow c. conversion process iv. parallel line d. data flow 1. l-a, ll-b,lll-c, lv-d 2. l-c, ll-a, lll-d, lv-b 3. l-c,ll-d, lll-a, lv-b 4. l-b, ll-a, lll-d, iv-c
Data modelling is the process of constructing 1. an orderly arrangement of data elements 2. a graphic representation of data contained in an information system 3. physical elements of the information system 4. a verbal description of the data need
Generally speaking,for a weak entity set to be meaningful it must be part of a 1. one-to-one relationship 2. one-to-many relationship 3. many-to-many relationship 4. depends on a particular situation
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