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Problem :
(b) A deductive database system is essentially the outcome of applying mathematics logic to database management, where logic is used for both data representation and data manipulation.
(i) Explain the relationships and the differences between a deductive databases and relational databases. (ii) In the context of deductive databases, explain the following concepts:
♦ Intentional database. ♦ Extensional database. ♦ Recursive query.
Indexed (Indexed Sequential) File Organisation It organises the file like a big dictionary, i.e., records are kept in order of the key but an index is stored which also allows
Why a report generator is used ? Report generator is used for print files on paper.
in an organization several projects are undertaken. Each project can employ one or more employees. Each employee can work on one or more projects. Each project is undertaken on the
Rearrange Classes and Operations Sometimes, the similar operation is defined across different classes and can easily be inherited from a familiar ancestor, but more often oper
Which is a legal expression in SQL? SELECT NAME FROM EMPLOYEE is a legal expression in SQL.
Define the terms i) DDL ii) DML DDL: Data base schema is specified by a set of definitions expressed by a special language known as a data def
In a relational model how relations are termed? In a relational model, relations are termed as tables. (The term ‘relation’ is the technical name of the ‘table’ in RDBMS)
Two Phase Locking (2PL) The two-phase locking protocol having of two phases: Phase 1 : The lock acquisition phase : If a transaction T needs to read an object, it wants to
What are called journaling file systems? File systems that support log disks are known as journaling file systems.
Soccer player ER Diagram to Relational database schema
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