How are database security and database integrity related? Briefly discuss the different levels of security measures which may be considered to protect the database.
Database security and database integrity are closely related because security ensures that only authorized users can access or modify data, while integrity ensures that data remains accurate and consistent. Without proper security, unauthorized users might corrupt or manipulate _________ ____ ___ ___ _______ _____ ______.
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Explain the Log-based recovery scheme with the help of an example.
Give the limitations of file based system. How can they be overcome using DBMS?
Write SQL commands for each of the following. Also illustrate the usage of each command through suitable example.
(i) Creation of views
(ii) Creation of sequences
(iii) Outer join
(iv) To give access permission to any use
Explain the need of Distributed DBMS over Centralized DBMS. Also give the structure of Distributed DBMS.
Write a query in SQL for the following:
(i) Find the name of authors whose books are published by "ABC Press".
(ii) Find the name of the author and price of the book, whose Book_ID is '100'.
(iii) Find the title of the books which are published by Publisher_ID '20' and are published in year 2011.
(iv) Find the address of the publisher who has published Book_ID "500".
Discuss the importance of file organisation in databases. Mention the different types of file organisations available. Discuss any one of the mentioned file organisations in detail.
How are database security and database integrity related? Briefly discuss the different levels of security measures which may be considered to protect the database.