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Describe logical data independence ?
Logical Data Independence - It is the capacity to modify the conceptual schema without having to change external schemas or application programs. The conceptual schema might be changed to expand the database (through adding a record type or data item), to change constraints, or to decrease the database (by removing a record type or data item). Only the view definition and the mappings required are changed in a DBMS that supports logical data independence. Changes to constraints could be applied to the conceptual schema without moving the external schemas or application programs.
What are the three types of data sources used with ODBC? An ODBC file data source is a file that can be shared between database users. An ODBC system data source is one that is
Although how will the system recover The selection of REDO or UNDO for a transaction for the recovery is completed on the basis of the state of the transactions. This state is
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What is called an evaluation primitive? A relational algebra operation annotated with instructions on how to evaluate is known as an evaluation primitive.
Step 1 . Using Oracle, create the tables identified in the preferred solution for Assignment 2. Technicians (ZipCode, TechnicianID, FirstName, LastName, Street, City, State, Home
Q. What is relational algebra and calculus? Explain the relational algebra operators :- Selection and predicate, set operation, joins and division. Sol. Relational Algebra
What are the requirements to ensure the objectives of file management principle is realized?
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What are the Issues when Selecting a Database Issues when Selecting a Database Storage space requirement: A database requires about triple storage space of the actua
What are the factors to be taken into account when choosing a RAID level? A) Monetary cost of extra disk storage requirements. B) Performance requirements in terms of number
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