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Speedup Query Processing:A query that includes data at various sites can be split into sub-queries. These sub- queries can be implemented in parallel by various sites. Such parallel sub-query evaluation permits faster processing of a user's query. In such type of cases in which data is replicated, queries might be sent to the least heavily loaded sites.
er diagram on cosmetics.
Consider an information system designed for an online company which provides IT products and services These include desktops, laptops, networking products, IT books, parts, and
Draw the precedence graph of the following schedule and determine whether the schedule is serializable. (Note that all instructions, except lock and unlock, are omitted. We assume
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
Write short notes on domain relational calculus The domain relational calculus uses domain variables that take on values from an attribute domain rather than values for whole
What are the situations while DBMS should not be used? DBMS should not be used in situations like: (i) No need of security. (ii) Not difficulty to access the data (iii) N
Given the subsequent relations: vehicle (reg_no, make, colour) Person (eno, name, address) Owner (eno, reg_no) Write expressions
Define the Immediate Update The immediate update methods may apply changes to the database on disk before the transaction arrives a successful conclusion. Though, these change
Explain the Difference between DROP and DELETE DELETE deletes one or more than one tuples of a particular relation from the database. DROP is employed to remove a table from th
explain at least five widly used case tools
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