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Define the term- Actors and Data Stores
Actors: An actor is the active object which drives data flow graph by producing or consuming values. Actors are attached to inputs and outputs of the data flow graph.
Data Stores: A data store is passive object within the data flow diagram which stores data for later access. A data store permits values to be accessed in the different order than they are generated.
What are the DBMS languages? Briefly explain? Data Definition language (DDL):A database schema is specified through a set of definitions expressed through a special language
Chapter 10a review questions
For each 1: n relationship type R involving two entities E1 and E2, we recognize the entity type (say E1) at the n-side of the relationship type R and contain primary key of the en
Client Server Databases- The concept behind the Client/Server systems is simultaneous, cooperative processing. It is an approach that presents a one systems view from a user's vie
What is meant by functional dependencies? Consider a relation schema R and α C R and β C R. The functional dependency α ->β holds on relational schema R if in any legal relati
I need to Map an E-R diagram to a relational schema
What is the need for triggers? Triggers are useful mechanisms for alerting humans or for starting particular tasks automatically when particular conditions are met.
Define Single Value and Multivalued attribute Single value attribute comprise a single atomic value for an entity and multivalued attribute may have much more than one value f
Benefits and limitations
define locking in simple language and decribed it
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