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What is Disadvantages Of DBMS ?
1. Cost of Software and Hardware and Migration - A important disadvantage of the DBMS system is cost.
2. Reduced Response and Throughput - The procedure overhead introduced through the DBMS to implement integrity, security, and sharing of the data causes a degradation of the response and throughput times.
3. Problem with Centralization - Centralization also means in which the data is accessible from a single source namely the database. This increases the potential of security breaches and disruption of the operation of the organization since of failures and downtimes.
Write a query to define tables students and teachers as sub tables of people? Create table students of student under people Create table teachers of teacher under people
Define a job scheduling strategy that will meet business requirement of reporting availability by 6am CST for the following cubes? Show the job scheduling dependencies in a pictori
Differance between Open addressing and chaining for collision resolution ? In open addressing , proceeding from the occupied position specified by hash address the program che
database help
Consider the join of a relation R with relation S. If R has m tuples and S has n tuples, then the maximum size of join is: If R has m tuples and S has n tuples then maximum siz
What is a super key? A super key is a set of one or more attributes that collectively permits us to recognize uniquely an entity in the entity set.
Attributes that are directly kept in the data base. For example, 'Birth date' attribute of a person. Derived Attributes that are not stored directly but can be derived
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
What is difference between TRUNCATE and DELETE? - Truncate can't be rolled back whereas Delete can be. - Truncate keeps the lock on table whereas Delete keeps the lock on ea
What is a recursive relationship? Give an example not used in the text. A recursive relationship is a relationship among an entity and itself. For example, given the entity PER
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