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!
Explain the relevance of Data Dictionary in a Database System?
Data dictionary is a database in its own right residing on the disk that consist of Meta data which is = Data about all entity sets + attributes + relationships between entity sets + constraints. It consists of compiled creates of definitions, structure and usage information on data stored, design decisions, application programme descriptions, usage standards, user information. It is consulted through DBMS before DML operation and through user to learn what each piece of data and several synonymous of data fields mean. Data dictionary can be integrated system whereas it is element of DBMS or add ons to DBMS. In integrated system data dictionary holds information concerning external, conceptual and internal level of data base. Both in source and object form. It contains source code of each data field value, frequency of its use, audit trail concerning updates and cross reference information. Present system is all add ons standards do not exist for integrity data dictionary along with DBMS. Data dictionary should be integrated in database it describes and therefore involves its own definition so that it can be queried with the similar language use for queering database.
Give the two reasons for allowing concurrency
The following relational database schema represents part of a simplified database used by a library: tblBook (BookID, Title, PublisherID, Category,Price) tblPublisher (Publishe
The following data are required to be stored by a family physician. Family#, FamilyAddress, Patient#, PatientName, ServiceCode, ServiceFee, ServiceDate A family can have seve
The Maximum no of key fields that can be used in a header is?? 50
Question 1 What do you mean by database management system? Question 2 Write a note on Object-Oriented Model Question 3 Explain Sequential File Organization Question
What does Aggregation mean?
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
a) Distinguish between ‘database' and ‘Database Management Systems (DBMS)'. b) List and briefly describe five potential benefits of the database approach compared to conventio
Define Assertions in SQL a. An assertion is a predicate that is expressing a condition we wish the database to always satisfy. b. Domain constraints, functional dependency
What is conceptual model ? A conceptual model is a independent of both hardware and software.
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: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd