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The issues relating to the Design of the Physical Database Files
Physical File is a file as stored on the disk. The major issues relating to physical files are:
• Constructs to link two piece of data:
• Sequential storage.
• Pointers.
What is De-normalization? De-normalization is the method of attempting to optimize the performance of a database by adding redundant data. It is sometimes essential because cur
An instance of relational schema R (A, B, C) has distinct values of A including NULL values. then A is a candidate key or not? If relational schema R (A, B, C) has distinct val
I need help in doing my dbms project
What is Data dictionary? A data dictionary is a reserved space in a database that is employed to store information about the database itself. A data dictionary may consist o
Write short notes on Schema diagram. A database schema along with primary key and foreign key dependencies can be depicted pictorially by schema diagram. Every relation appears
Define object-relational systems? Systems that give object-oriented extensions to relational systems are known as object-relational systems.
What is multiple relationship ?
Define According to the levels of abstraction, the schema at the intermediate level is called Ans: As per to the levels of abstraction, the schema at the intermediate level is
Consider the relations City (city_name, state) Hotel (name, address) City_hotel (hotel_name, city_name, owner) Answer the following queries in relational algebra (i) Find
Hierarchical model is also known by? A hierarchical model is also known as a Tree structure.
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