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Database Errors:An error is said to have occurred if the implementation of a command to manipulate the database cannot be successfully finished either due to inconsistent data or because of state of program. For instance, there may be a command in program to kept data in database. On the implementation of command, it is found that there is no place / space in database to accommodate that additional data. Then it can be said that an error has happened. This error is because of the physical state of database storage.
Probelm: (a) A distributed database (DDB) is a collection of multiple, logically interrelated databases which are physically distributed over a computer network" (i) Give a
Design a generalization–specialization hierarchy for a motor-vehicle sales company. The company sells motorcycles, passenger cars, vans, and buses. Justify your placement of attrib
What are referential integrity constraints? A value that appears in single relation for a given set of attributes also appears for a particular set of attributes in another rel
Q.1 Briefly discuss the different layers of ANSI SPARC architecture. Ans: The three layers of ANSI SPARC architecture are like this: 1. Internal view is at the lowest leve
What does Aggregation mean?
Write the motivations led to development of OO-DBMS? 1. Programmer frustration with RDBMSs. 2. Requirement for special features.
explain in detail about crash recovery
While sorting field groups we cannot use more than one key field False.
Is it mandatory to declare all the tables in Report by the key word tables for all the tables that exist in the structure of LDB, and are being explained in the Database part of LD
With the help of an example display how records can be deleted and updated in QBE. (i) Increase Pay_Rate of employees along with the skill of ‘cook' by 10%. (ii) Delete employee
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