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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.
Explain mechanism of nested queries? SQL gives a mechanism for nesting subqueries. A subquery is a select from where expression that is nested within one more query. A common u
Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
" Wound-wait" scheme : It is based on a preemptive method. It is based on a simple rule: If Ti requests a database resource that is held by Tj
Single Valued Normalisation Codd in the year 1972 formed three normal forms (1NF, 2NF, and 3NF). These were based on functional dependencies between the attributes of a relati
what is physical data structure
wrie a report on whether a BSc n information systems develops the skills required by employers in Database administration
What is the difference among a database schema and a database state? The collection of information stored in database at particular moment in time is known as database state a
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
A Structure of a dependency diagram
Determine the Strong and Weak Entity Based on the method of foreign key, there might be arise a situation when we have to relate an entity having a primary key of its own and a
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