0
Difference between direct sequential file and index sequential file?
Wiki User
∙ 13y ago
Explain the difference between sequential and direct file access.
A. Sequential access to data is used when the data has to be read from the start, in sequence. It is the normal method of access for magnetic tape. Direct access is used when it is possible to jump directly to a file or data item without reading through all the items stored before it. This is the normal method used for hard disks.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoA direct file allows quick access to any data in the file; if I want the 50th payroll record I can retrieve it directly with very few I/O accesses.
A sequential file cannot be accessed randomly (as above). To get the 50th payroll record you have to read the first 49 records to get to it, which isn't very efficient or fast.
Usually in a direct file you know exactly where on the device the record is that you want to retrieve or update. That immediately makes it much faster than a sequential file.
Add your answer:
Earn +20 pts
Implementation of index sequential file organization?
Indexed sequential file organization. =In indexed sequential file organization, the records arestored in sequence according to a primary key and an index is created to allow random access of the file. This type of organization also allows the file to be accessed sequentially. Indexed sequential is the most commonlyused type of file organization. writer-k.k.b -montanna
What is difference between insulation resistance test and polarization index?
Insulation resistance test: This test is used to find the insulation resistance of motor for 1 min or 10 min through high voltage insulation tester. By this we can find the insulation level. Polarization index: This is the ratio between insulation resistance for 10 min to insulation resistance for 1 min.
Difference between index and table of content for report writing?
Differentiate the Index to Table of contentsThe Table of Contents gives youa list of chapters, main subjects headingsand is always at the beginning of a book.An Index is at the end of a book and is verydetailed list of words theories that can be foundon specific pages throughout the book, has a lotmore information like what is on every pageArGeNe PeLosUbScRiPtHoLy InFaNt MoNtEsSoRi CeNteR
What is the difference between a search engine and a gateway?
A gateway is a group of librarians and researchers. A search engine is designed to search the internet for information.
What is Modulation index in Frequency modulation?
Modulation Index is the ratio of the maximum deviation frequency to the frequency of modulation. In other words it is the ratio of the spread in frequency spectrum to the frequency that was used to modulate the carrier. For FM, modulation index is given by the formula mf= df/f where, mf=modulation index for FM df=difference in carrier frequency f=frequency of the signal
Defference between direct sequential and index sequential?
reduce the chance of false identification.----apex
Differentiate between Direct Access and Sequential Access methods?
the difference between them is that direct access, such as a DVD allows you to go directly to a specific piece of data using an index, whereas sequential access is when data is chronologically stored on a VCR tape or Magnetic tape, you must go through all the data before you reach the data your looking for.
Difference between Index File and Index Sequential file?
index file is organized with the help of any key as index number at rondomly but index sequencial file organized with the help of any index sequentialy rajesh patel
What is difference between sequential file and index file?
the index file is more sicurity checked and contains more information about the acess . for example An indexed file is a computer file with an index that allows easy random access to any record given its file key.The key must be such that it uniquely identifies a record. If more than one index is present the other ones are called alternate indexes.The COBOL language supports indexed files with the following command in the FILE CONTROL section. however a sequential file isA file that contains records or other elements that are stored in a chronological order based on account number or some other identifying data. In order to locate the desired data, sequential files must be read starting at the beginning of the file. A sequential file may be stored on a sequential access device such as magnetic tape or on a direct access device such as magnetic disk. Contrast with random-file.Read more: sequential-fileContent of sequential file can't be accessed directly while index file content can be accessed directly through pointer. Sequential file is time consuming in comparison with index file.Example: Index of book - index fileExample: Bundle of plates - sequential file
What is index sequential and relative files?
Index sequential files store records in sequential order and use an index to quickly locate specific records. Relative files store records based on their physical position in the file, allowing for direct access to records using their relative position within the file.
What are the difference's between contour interval and index contour?
What are the difference's between contour interval and index contour?
What is the index error in theodolite?
Half of the difference between the two positions is called the "index error".
Is there any difference between index and indicator?
yes there iis
What are the difference between Unicode and ASCII code?
describe the destination index
Differences between index and direct test?
The indirect test is one that you might find out about while researching. The direct testis what you are looking for.
What is the difference between viscosity and viscosity index?
Viscosity is resistance to flow of oil Viscosity Index is a scale to measure viscosity
What is the difference between a glossary and index?
A glossary defines words, while the index tells what pages certain topics are on in the book.
