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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.
Critically evaluate the bulleted list of information-related items in this case study. How are each contradictory to the notion of being an information-literate knowledge worker?
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
What is candidate key? Candidate Key - A candidate key of an entity set is a minimal superkey, which uniquely identifies each row in the relation.
Use again the GE Flight Quest Data and build on the work done for homework 1 and 2. The goal is to create a classification model which classifies flights into "on-time" (you can de
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
(a) Provide the description of the following ODMG schema in the Object Definition Language (ODL). (b) Based on the above object database, write the following queries i
explain ANSI SPARC architecture
The Enhanced Entity Relationship Diagram (ERD) produced with a drawing or case tool. Your EERD must use a ''standard'' notation style such as Crows Foot or Chen. Please note that t
What are called multilevel indices? Indices with two or more levels are known as multilevel indices.
read-set(T) : Each data items that are read by a transaction T Timestamps : for all transaction T, the start-time and the end time are reserved for all the three phases.
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