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Explain the ANSI SPARC architecture
The three-schema architecture is as well known as ANSI SPARC architecture. The aim of the three-schema architecture is to separate the user applications and the physical database. The view at every of these levels is described by a schema. The procedures of transforming requests and results among levels are known as mappings. In this architecture, schemas can be illustrated at the following three levels:
What is Asterisk in SQL? Asterisk (*): In SQL, the columns for all the tables and views in the FROM clause will be displayed.
What is known as sequential file organization? In the sequential file organization, the records are kept in sequential order, according to the value of a "search key" of every
In a relation, tuples are not inserted in any definite order. Ordering of tuples is not defined as a part of a relation definition. Though, records may be structured later accordin
A database will be made to store information about patients in a hospital. On arrival, each patient’s personal details (name, address, and telephone number) are recorded where poss
Related fields in a database are grouped in which form? Related data fields in a database are grouped to form a data record. (A record is a collection of related fields)
Although, the essential features of E-R diagrams are enough to design many database situations. Though, with more difficult relations and advanced database applications, it is need
Discuss deferred update technique of recovery. What are the advantages? Ans: The deferred update methods do not physically update the database on disk till after a transact
What is it ?
Authorisation Authorisation is the culmination of the administrative policies of the organisation. As the name shows, authorisation is a set of rules that can be used to verif
In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
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