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Explain the Management of Data Store
Every system irrespective of its nature of application requires storing permanent data for consequent use in problem solving. Some objects in models need to be constant to store the state of object permanently in database. Most systems need constant data which is not lost when system closes down. These data are stored in file system in database. Object-oriented applications sometimes use relational databases to provide persistence.
1. Which relational algebra operations do not need the participating tables to be union-compatible? Ans: Join is the relational algebra operations that do not need the particip
Objectives After Reading this part, you should be able to: Explain the term CONCURRENCY; Describe the term transaction and concurrent transactions; Talk about co
What is relational model feature? A relational model feature is much more data independence than some other database models.
A distributed transaction consists of subtransactions that execute at different sites and access local DBMSs at those sites. For example, a distributed transaction that transfers m
write-set(T): Each data items that are written by a transaction T
What are aggregate functions? And list the aggregate functions supported by SQL? Aggregate functions are functions that take a collection of values as input and return a one va
Why older data models are being replaced by new data modelling 100 words accepted#
Consider the following relational schema: PERSON (SS#, NAME, ADDRESS) CAR (REGISTRATION_NUMBER, YEAR, MODEL) ACCIDENT (DATE, DRIVER, CAR_REG_NO) OWNS (SS#, LICENSE) Constru
Modular growth: In distributed environments, it is simple to expand. Latest sites can be added to the network without affecting the operations of other sites, as they are somewhat
The objectives of this assignment are: - to develop skills in the design of database driven applications - to develop skills in applying SQL to implement the relational and
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