Why to build or create a data model? To avoid redundancy of data in a OLTP database. In Data Warehousing, data from source systems can be transformed as per the rules and loaded into target tables. In Data Warehousing, you can do data profiling by cleaning the data from source systems and load that into…
What is a Data Model? A Data model is a conceptual representation of data structures (tables) required for a database and is very powerful in expressing and communicating the business requirements. Data Modeling Overview: A data model visually represents the nature of data, business rules governing the data, and how it will be organized in…
We are focusing to create this physical data model with oracle as the database. So we have selected oracle 12c as the database. Open existing logical data model “02_LDM_creating_entity_version2”. Click menu Model/Generate Physical Model. A small screen will appear. Click ok. A new screen is opened. There are 5 steps in this process. We are…
Create a .csv file named “Naming_Standards.csv” and store the following information in that csv file. The reason for creating this file is to avoid errors and typos in our naming conventions and data modeling naming convention standards can also be followed. We have eliminated VOWELS in the actual word so that physical object names will…
Now, we are going to make changes to the previously created data model. So create another file LDM_creating_entity_version2. Open the previous data model “LDM_creating_entity_version1” and click menu file/save as “LDM_creating_entity_version2”. How to add entity and attributes in ER Studio Data Architect: Add the following attributes to “Employee” Entity. Place the cursor in attribute section of…
The following example has been created from the Embarcadero’s product ER/Studio Data Architect, Version 10.0. You can find different products in the URL http://www.embarcadero.com/products. For more information, please visit http://www.embarcadero.com. ER/Studio Data Architect is a powerful Data Modeling tool with several applications. You can create either relational data model or dimensional data model from Embarcadero’s ER/Studio…
1. What is normalization? E.F. Codd gave some rules to design relational databases and the rules were focused on removing data redundancy which helps to overcome normal data modeling problems. The process of removing data redundancy is known as normalization. 2. What are the types of normalization? First normal form, Second normal form, third normal…
The following data modeling questions and answers are conceptual questions that are asked during the data modeler interview. 1. What is data modeling? A data model is a conceptual representation of business requirement (logical data model) or database objects (physical) required for a database and are very powerful in expressing and communicating the business requirements…
