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What are the two approaches to store relations in distributed database?
a) Replication
b) Fragmentation
differences between a classified catalog and a dictionary catalog
What is the difference between serial and sequential files? How searching is applied on both? Ans: A serial file is one where the records have been stored in the order where
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
Suppose R is a relation with attributes A1, A2,..., An. As a function of n, tell how many superkeys R has, if: 1.1 The only key is A1. 1.2 The only key is A1 and A2. 1.3 The o
What is an entity relationship model? The entity relationship model is a collection of basic objects known as entities and relationship between those objects. An
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
(a) Provide the description of the following ODMG schema in the Object Definition Language (ODL). (b) Based on the above object database, write the following queries i
Explain the two types of participation constraint. Total: The participation of an entity set E in a relationship set R is said to be total if each entity in E participates i
Define Catalog and meta data ? A catalog is a compilation of records elaborating the contents of a particular collection or group of collections. Metadata (Meta data, or someti
Rules Of Data Normalisation Let us now summarise Normalisation with the help of various clean rules. The following are the necessary rules for the Normalisation process: 1.
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