Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
How does a query tree represent a relational algebra expression?
Ans: This includes transforming an initial expression (tree) into an equivalent expression (tree) that is more proficient to execute. Two relational algebra expressions are said to be equal if the two expressions produce two relation of the same set of attributes and consist of the same set of tuples even though their attributes may be ordered in a different way.
The query tree is a data structure which denotes the relational algebra expression in the query optimization process. In the query tree the leaf nodes correspond to the input relations of the query. The internal nodes denote the operators in the query. While executing the query, the system will execute an internal node operation when its operands available after that the internal node is replaced by the relation which is acquired from the preceding execution.
What are the two types of indices? The two types of indices are:- A) Dense index B) Sparse index
What is a B+-Tree index? A B+-Tree index takes the form of a balanced tree in which each path from the root of the root of the root of the tree to a leaf of the tree is of the
Define garbage collection. Garbage may be formed also as a side effect of crashes. Periodically, it is essential to find all the garbage pages and to add them to the list of fr
Describe the difference between a one-to-many and a many-to-many relationship. Which logical data structures comprise one-to-many and which comprise many-to-many relationship?
A well-maintained relational DBMS has a high level of data integrity. What features of a relational DBMS contribute towards this level of integrity? Relational DBMS gives high
Question 1 Discuss on transmission impairments Question 2 What is framing? Question 3 Write a note on 10Base2 10Base- T Question 4 Explain the rev
what factors might influence a company to outsource its IT infrascture.
how to submit answers softcopy
Events4Fun is an event management company in Europe with branches in South America as well. The company is well-known for its efficiency, good-quality services, and affordable char
Depending upon the rules we have found, we can classify the locks into two types. Shared Lock: A transaction might be acquiring shared lock on a data item in order to read it
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd