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!
Indexed (Indexed Sequential) File Organisation
It organises the file like a big dictionary, i.e., records are kept in order of the key but an index is stored which also allows a type of direct access. The records are kept sequentially by primary key values and there is an index built over the primary key field.
The retrieval of a data from a sequential file, on average, needs access to half the records in the file, making such inquiries not only useless but very time consuming for big files. To improve the query response time of a sequential file, a type of indexing method can be added.
An index is a set of address pairs, index value. Indexing associates a set of objects to a set of orderable quantities, which are generally smaller in number or their properties. Therefore, an index is a mechanism for faster search. While the indices and the data blocks are stored together physically, they are logically distinct. Let us use the word an index file to defines the indexes and let us refer to data files as data records. An index can be small sufficient to be read into the main memory.
A sequential file that is indexed on its primary key is known as an index sequential file. The index permits for random access to records, as the sequential storage of the records of the file gives easy access to the sequential records. An additional feature of this file system is the over flow area. The overflow area gives additional space for record addition without the need to make.
What are the Constituents of File? Also elaborates all the possible file operations? A file is organised logically as sequence of record. These records are mapped onto disk blo
A TDMS project plan is not a typical Information Technology project plan; therefore, a traffic data project has several unique characteristics: Traffic data management system
a) Suppose we updated the catalog tables in real time, that is, after every update, insert, or delete SQL statement were executed-rather than only running RUNSTATS once every few
Explain Data Sublangauges ? Data sublanguage: In relational database theory, the term sublanguage, first used for this purpose through E. F. Codd in the year of 1970, refers t
Define the step - Rearranging the Execution Order for Efficiency As we know that algorithm and data structure are closely related to one another, but data structure is conside
The result of the UNION operation between R1 and R2 is a relation that includes? The result of the operation between R1 and R2 includes all the tuples of R1 and R2 which have c
Use a Set operator to create a list of academics who have written or co-written less than 5 papers and also have greater than 3 interests. List their academic number in the output.
vertical fragmentation
Create centralized relational database using bottom up method. (a) Recognize a single un-normalized relation for the above scenario. (b) Recognize the primary key for
Example- Search the salary of employees who are not 'ANALYST' but get a salary below than or equal to any people employed as 'ANALYST'. SELECT EMPNO, ENAME, JOB, SAL FROMEMP
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