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Write short note on Data models?
Data models: A data model is an abstract model which elaborates how data is represented and accessed. The term data model has two commonly accepted meanings:
• A data model theory that is a formal description of how data may be structured and accessed.• A data model instance that is applying a data model theory to create a practical data model instance for a few particular application.
Question: a) There are three concurrency problems, i.e. three types of potential mistake which could occur if concurrency control is not properly enforced in the database syst
What is an Index? An index is a small table having only two columns. The first column has a copy of the primary or candidate key of a table and the second column having a set o
Which two tools are used to administer users for Active Directory?
what is 3nf
Which model is record based logical model? Network Modelis basically known as record based logical model.
under what condition log based recovery is feasible?
Question: (a) What is ODBC and what is its function? (b) What is Web application server, and how does it work from a database perspective? (c) What does e-commerce mean
Explain the concept of generalization and aggregation in E_R diagrams. Give one example for each one of them? Generalization: Consider extending the entity set account throug
What are segments in oracle? Segments - Each table has single field of disk space, known as segment, set aside for it in the tablespace. Segments consist of contiguous sections
Find out the names and company names of all employees sorted in ascending order of company name and descending order of employee names of by which company. SELECT EMPLOYEE_NAME,
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