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!
Secondary Indexes
Let consider the student database and its clustering index and primary (only one will be applicable at a time). Now consider the state when the database is to be searched or accessed in the alphabetical order of names. Any search on a student name would need sequential data file search, therefore, is going to be very time consuming. Such a search on an average would need reading of half of the total number of blocks.
Therefore, we require secondary indices in database systems. A secondary index is files that have records having a secondary index field value which is not the ordering field of the data file, and a pointer to the block that have the data record. Please note that even if a data file can have only single primary index (as there can be only single ordering of a database file), it can have many secondary indices.
Secondary index can be described on an alternate key or non-key attributes. A secondary index that is described on the alternate key will be dense as secondary index on non-key attributes would need a bucket of pointers for one index entry. Let us define them in more detail with the help of Figures.
What is a checkpoint? List the operations to be performed by the system when a checkpoint is to be taken. What does the recovery system do if there is a crash? There is large n
Name the metrics for selecting top algorithm There are a number of metrics for selecting top algorithm: i) Computational complexity: Computational complexity refers to eff
What are the different strategies of implementation of the Statecharts? There are two strategies for implementation of state charts: i) Basic Implementation Strategy
Write the C++ program having class name studentinfo, that is used to store the VU student information: This class should store your VUID, campus id, name and father name in the fol
what is er digram given that example of hospital,bank and library er digram.
Describe the GRANT function and explain, how it associates to security. What kind of privileges may be granted? How are they revoked? Ans: Since more than one user can aacce
How can i turn a conceptual entity relationship diagram into a logical entity relationship diagram? what do i have to do with "mandetory or" and "optional or" relationships?
What function divides one numeric expression by another and returns the remainder? MOD function divides one numeric expression by another and returns the remainder.
List the steps for converting state diagram to the code. a) Finding major control path b) Finding the conditional statements c) Finding the loops d) Finding error ro
PART MARKING: We will only mark TWO of the four questions below but you must submit answers to all four. We will choose the questions we mark randomly and we will supply you with
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: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd