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What is Oracle databse structure?
Oracle database structure: The relational model has three main aspects:
Structures: Structures are well-defined objects which store the data of a database. Structures and the data contained inside them can be manipulated through operations.
Operations: Operations are clearly described actions which permit users to manipulate the data and structures of a database. The operations on a database must adhere to a pre- described set of integrity rules.
Integrity Rule: Integrity rules are the laws in which govern those operations is permitted on the data and structures of a database. Integrity rules protect the data and the structures of a database.
An ORACLE database has both a physical and a logical structure. Through separating physical and logical database structure, the physical storage of data could be managed without affecting the access to logical storage structures.
let us consider a table having 2200 records and the fixed size of the table to be considered as 25.then how many numbers of table is requredto perform horizontal fragmentation
What are called multilevel indices? Indices with two or more levels are known as multilevel indices.
What is Multivalued Attribute? Multivalued Attribute - Multivalued attribute might have more than one value for an entity. For instance, PreviousDegrees of a STUDENT.
Consider the following relations: S (S#, SNAME, STATUS, CITY) SP (S#, P#, QTY) P (P#, PNAME, COLOR, WEIGHT, CITY) Give an expression within SQL for each of queries b
how the string works as keyword?
how to solve the C type problems?
What is storage manager? A storage manager is a program module that gives the interface between the Low level data kept in a database and the application programs
Explain the structure of well formed formulae in relational calculus. Ans: a. An atom is a formula b. If P1 is a formula, after that so are ¬P1 and (P1) c. If P1 and P2 a
Explain the following functions of Oracle with suitable examples: (i) To_Char( ) (ii) Count( ) (iii) Trim( ) (iv) Length( ) Ans: (i) To_char( ): The TO_CHAR function conver
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
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