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!
Which sorting technique is used to sort databases, whose sizes are very big? Give one such algorithm. Why do sorting techniques like quicksort, insertion sort, etc. not applied on very big databases?
Ans: To sort a large database or file, the sort-merge (or k-way merge) algorithm is extensively used. This is one of the external sorting algorithms. External sorting algorithm considers to sorting algorithms that are appropriate for large file of records stored on disk that do not fit completely in main memory, like most database files. The sort-merge algorithm begins by sorting small subfiles --called runs - of the main file and then merges the sorted runs, making larger sorted subfiles which are merged in turn. Such as other database algorithms, it needs buffer space in main memory, in which the actual sorting and merging of the runs is performed. This algorithm contains two phases:
(1) the sorting phase, and
(2) the merging phase.
The sorting methods like quick sort, insertion sort, etc. are not applied on large databases as these are internal sorting algorithms, which need buffer space in main memory. The space complexities of these algorithms are O (n) and require a large buffer space in major memory to sort the large database. Hence, internal sorting algorithms are not applied on large databases.
Exclusive lock It is asked for by a transaction on a data item that it wants to update. No other transaction can put either a shared lock or an exclusive lock on a dat
Define the following constraints for the table client. (i) BAL_DUE must be at least 1000. (ii) NAME is a unique key. (i)ALTER TABLE CLIENT ADD CONSTRAINT CLIENT_BAL_DUE_C1
Different stages of DDLC ?
Haw does it work one database application
Explain Relational model and their use in DBMS? Relational Model - The relational model was first introduced through E.F. Codd of the IBM Research in the year of 1970. The mode
Hello.I have database access assignment which consist of creation Form, Subform, Calculation, Macros
MySQL Database Merge Project Description: I have two databases, I need merge the data of one database into another Work to be done online right now. Payment can be done
The ABC Bank authority now wants to create a database for their customers. So you are requested to modify your program of Assignment A3 as follows. The main program first displa
Assume you are given a uniprocessor system with one gigabyte of memory and a 300 gigabyte disk. The OS on the machine has a demand paged virtual memory system with a local page rep
Describe analysis of access paths To describe analysis of access paths, consider an example of the design of a company's employee skills database. A part of the object model fr
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