Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Database Administrator
One of the main perpose for having the database management system is to have control of both data or programs accessing that data. The person having like control over the system is called as the database administrator (DBA). The DBA administers the 3 stages of the database and tells the global view or conceptual level of the database. The DBA also displays the external view of the applications and several users and is responsible for the definition and execution of the internal level, as well as the storage structure and access techniques to be used for the optimum performance of the DBMS. A modification to any of the 3 levels due to varies in the organisation and/or emerging technology is under the control of the DBA.
Mappings among the internal and the conceptual levels, as well as between the conceptual and external levels, are also describe through the DBA. The DBA is responsible for granting permission to the users of the database and remainsthe profile of each user in the database. This profile defines the permissible activities of a user on that portion of the database accessible to the user through one or more user views. The user profile could be used by the database system to confirm in which a particular user can present a given operation on the database.
The DBA is also responsible for describing procedures to recover the database from natural, failures due to human, or hardware causes along with minimal loss of data. This recovery procedure should permit the organisation to continue to function and the intact portion of the database has to continue to be available.
Therefore, the functions of DBA are:
SET concept is used in which type of modelling? SET concept is used in Network Model.
Parallelism of transaction execution: A transaction can be divided into various sub-queries that can operate on fragments in parallel. This enhances the degree of concurrency in t
Draw an Entity-Relationship model for the relational schema given in the Appendix. Show all the entities, relationships, relationship names, and attributes and also underline the
explain three types of internet risks to the consummers whent he business system is data dependent. how can we minimise these risks
System R was developed and designed over a period of 1974-79 at IBM San Jose Research Company. Its purpose was to illustrate that it is possible to create a Relational System tha
Define Shared locks? Ans: Shared lock: Throughout concurrent execution of transactions, earlier than a transaction can access a data item, it has to obtain a lock on it. Now he
What are two special events? The two special events are as "entry" and "exit". Any action which is marked as linked to entry event is executed whenever given state is entered v
A basic model of Database Access Control Models of database access control have grown out of previous work on protection in operating systems. Let us talk about one simple mode
Create 1 experiment to demonstrate an aspect of query optimisation by using access-path structures (indexes), decomposition, or denormalisation. Once satisfied with your experiment
List any eight applications of DBMS. a) Universities b) Airlines c) Banking d) Credit card transactions e) Tele communication f) Sales g)Finance h) Manufac
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd