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Operational Data Store Interview Questions & Answers - Learning Mode
COOLINTERVIEW.COM DATA WAREHOUSING INTERVIEW QUESTIONS OPERATIONAL DATA STORE INTERVIEW QUESTIONS QUESTIONS & ANSWERS - LEARNING MODE

Operational Data Store Interview Questions & Answers - Learning Mode

An operational data store (or "ODS") is a database designed to integrate data from multiple sources for additional operations on the data. Unlike a master data store, the data is not passed back to operational systems. It may be passed for further operations and to the data warehouse for reporting. An operational data store (ODS) is a type of database that's often used as an interim logical area for a data warehouse.

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Operational Data Store Interview Questions & Answers - Learning Mode
Try Operational Data Store Interview Questions & Answers - Exam Mode
Question: What is operational data store?

Answer: An operational data store (or "ODS") is a database designed to integrate data from multiple sources to make analysis and reporting easier. Source: CoolInterview.com
Question: When is a functional dependency F said to be minimal?

Answer: ► Every dependency in F has a single attribute for its right hand side.
► It cannot replace any dependency X -->A in F with a dependency Y--> A where Y is a proper subset of X and still have a set of dependency that is equivalent to F.
► We cannot remove any dependency from F and still have set of dependency that is equivalent to F.
Source: CoolInterview.com
Question: What is Multivalued dependency?

Answer: Multivalued dependency denoted by X-->Y specified on relation schema R, where X and Y are both subsets of R, specifies the following constraint on any relation r of R: if two tuples t1 and t2 exist in r such that t1[X] = t2[X] then t3 and t4 should also exist in r with the following properties

► t3[x] = t4[X] = t1[X] = t2[X]
► t3[Y] = t1[Y] and t4[Y] = t2[Y]
► t3[Z] = t2[Z] and t4[Z] = t1[Z]

where [Z = (R-(X U Y)) ] Source: CoolInterview.com
Question: What is DDL (Data Definition Language)?

Answer: A data base schema is specifies by a set of definitions expressed by a special language called DDL.
Source: CoolInterview.com
Question: What is a Relation Schema and a Relation?

Answer: A relation Schema denoted by R(A1, A2, ?, An) is made up of the relation name R and the list of attributes Ai that it contains. A relation is defined as a set of tuples. Let r be the relation which contains set tuples (t1, t2, t3, ..., tn). Each tuple is an ordered list of n-values t=(v1,v2, ..., vn). Source: CoolInterview.com
Question: What is degree of a Relation?

Answer: It is the number of attribute of its relation schema. Source: CoolInterview.com
Question: What is VDL (View Definition Language)?

Answer: It specifies user views and their mappings to the conceptual schema.
Source: CoolInterview.com
Question: How does Tuple-oriented relational calculus differ from domain-oriented relational calculus?

Answer: The tuple-oriented calculus uses a tuple variables i.e., variable whose only permitted values are tuples of that relation. E.g. QUEL

The domain-oriented calculus has domain variables i.e., variables that range over the underlying domains instead of over relation. E.g. ILL, DEDUCE.
Source: CoolInterview.com
Question: What is Relationship?

Answer: It is an association among two or more entities.

Relationship Set - The collection (or set) of similar relationships.

Relationship Type - Relationship type defines a set of associations or a relationship set among a given set of entity types.

Degree of Relationship Type - It is the number of entity type participating.
Source: CoolInterview.com
Question: What is normalization?

Answer: It is a process of analysing the given relation schemas based on their Functional Dependencies (FDs) and primary key to achieve the properties

► Minimizing redundancy
► Minimizing insertion, deletion and update anomalies.
Source: CoolInterview.com
Question: What is Functional Dependency?

Answer: Functional dependency is denoted by X --> Y between two sets of attributes X and Y that are subsets of R specifies a constraint on the possible tuple that can form a relation state r of R. The constraint is for any two tuples t1 and t2 in r if t1[X] = t2[X] then they have t1[Y] = t2[Y]. This means the value of X component of a tuple uniquely determines the value of component Y.
Source: CoolInterview.com

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