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Define DBA database administrator?
DBA: A database administrator (DBA) is a person who is responsible for the environmental aspects of a database. In common, these involves:
Recoverability - Creating and testing Backups Integrity - Verifying or helping to verify data integrity Security - Defining and/or implementing access controls to the data Availability - Ensuring maximum uptime Performance - Ensuring maximum performance Development and testing support - Helping programmers and engineers to economically utilize the database
MOSS VALE is a town with 15000 inhabitants. The fire department wishes to develop a system that automates the despatch of fire engines to attend fires. The ERD below describes the
What is schema
Determine the term- Active values An active value is that has dependent values. Every dependent value registers itself with active value that contains a set of dependent values
List the types of authorization. A) Read authorization B) Write authorization C) Update authorization D) Drop authorization
Use of partial data by applications : In common, applications work with views rather than whole relations. Thus, it may be more appropriate to work with subsets of relations rather
What is meant by data-transfer rate? The data-transfer rate is the rate at which data can be retrieved from or kept to the disk.
Ancestry database records information about family trees . Following information is recorded about each person: FIRSTNAME first name SURNAME surname MNAME maiden name (if
Explain Candidate key? Candidate Key - A candidate key is a minimal superkey, that can be used to uniquely identify a tuple in the relation.
What is the max. no. Of structures that can be included in a table or structure. Nine.
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