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Database Recovery And Security
Introduction
In this part we will introduce two main issues relating to database management systems.
A computer system suffers from dissimilar types of failures. A DBMS controls very critical data of an organisation and thus must be reliable. Though, the reliability of the database system is related to the reliability of the computer system on which it runs. In this part we will talk about recovery of the data having in a database system following failure of several types and present the dissimilar approaches to database recovery. The types of failures that the computer system is likely to be subjected to contain failures of components or subsystems, power outages, software failures, accidents, unforeseen situations and natural or man-made disasters. Database recovery methods are techniques of making the database consistent till the last possible consistent state. The aim of recovery scheme is to permit database operations to be resumed after a failure with minimum loss of information at an economically justifiable cost.
The second important issue that is being discussed in this unit is Database security. "Database security" is protection of the information included in the database against unauthorised access, destruction or modification. The first condition for security is to have Database integrity. "Database integrity" is the mechanism that is applied to ensure that the data in the database is consistent.
The dataset " CFOLYMPICS.XLS " contains the observations used in the above article. The definitions of the variables are also included in this spreadsheet. However, for the purpo
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 Check Clause The CHECK clause is employed to at the end of a CREATE TABLE statement specify table constraints. This is known as table-based constraint because it ap
Consider the following database schema: STAFF(StaffNo, fName, lName, Position, sex, dob, branchNo) BRANCH(BranchNo, Street, City) Assume the following for the above database
Explain trigger? Trigger: A database trigger is procedural code which is automatically executed within response to certain events on a particular table in a database. Trigger
This assignment is worth 45% of your final grade for this module. Marks will be awarded as follows: Prototypes (wireframe and web based prototype) You are expected
Complete replication: It implies maintaining of a whole copy of the database at every site. Thus, the reliability & availability and performance for query response are maximized.
Preliminary entities and attributes of human resourse management database management system
Due date for May 8
Farmer Bob, Farmer Jane and Farmer Jose run a cow farming co-op. For every cow they keep the cow’s name, age (or date of birth), breed and numbered plastic ear tag. The each of t
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