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what is database management system? & why it is required?
Selective replication: This is a combination of generating small fragments of relation and replicating them rather than a entire relation. The data should be fragmented on require
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
Define the term Domain. For each n every attribute there is a set of permitted values known as the domain of that attribute.
sql is relationally complete-justify
Given the following relations Vehicle (Reg_no, make, colour) Person(eno, name, address) Owner(eno, reg_no) Write expressions in the relational algebra to answer the following
What is an Operand? The data on which the operation is to be performed is known as an Operand
A field-groups statement or an insert statement reverses storage space and transfers values. False.
Timestamps For Read operations: If TS (T) If TS (T) >= W-timestamp (Q), then the transaction T is trying to read a value of data item Q which has been written and committed
HOW MANY TYPES OF VIEWS
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