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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.
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Content 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 file
Example: Bundle of plates - sequential file
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∙ 11y ago
A sequential file stores data in a linear, sequential order for efficient reading and writing operations. An index file contains key-value pairs where the key is used to locate the corresponding value quickly, allowing for faster data retrieval but potentially slower writing operations.
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What is a indexed sequential file?
An indexed sequential file is a type of file organization where data records are stored sequentially in the order of key values. An index is maintained to help locate records quickly. This combination of sequential storage and indexing allows for efficient access to data in both sequential and random access patterns.
What are the advantages and disadvantages of indexed-sequential file organization?
Advantages of indexed-sequential file organization include efficient access to records through an index and sequential storage for faster retrieval. However, disadvantages may include increased complexity in managing the index and potential performance degradation due to index maintenance overhead.
What are the advantages of indexed-sequential file organisation?
Indexed-sequential file organization allows for efficient storage and retrieval of records by combining the benefits of sequential access (fast for batch processing) and direct access (quick for individual record retrieval). It provides faster access to records compared to purely sequential files while maintaining sequential organization for improved batch processing performance. The index allows for quick access to specific records without needing to search through the entire file.
What are the differences between serial file organization and sequential file organization?
Serial file organization stores records in a linear format, while sequential file organization stores records in a specific order defined by a key field. In serial file organization, records don't have to be retrieved in a specific order, whereas in sequential file organization, records are retrieved based on the key field's order.
What is the disadvantage of sequential file organization?
One disadvantage of sequential file organization is that it can be slow for locating and accessing specific records, as the entire file must be scanned sequentially from the beginning to find the desired data. Additionally, inserting or deleting records in a sequential file can be inefficient and may require reorganizing the entire file.
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 the difference between the file maintenance and file organization?
file organization is of 3 types sequential,direct and indexed sequential where how data is accessed in eash file is decided where as file maintainence is
Difference between direct sequential file and index sequential file?
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.
What different types of file processing system?
sequential file organization index file orgaization diect file orgaization
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
Difference between sequential organization and serial organization?
the difference is that sequential organization: this are records are stored and accessed in a particular order sorted using a key field serial organisation: records in a file are stored one after another. You need to go first file in order to reach the required file.
Difference between sequential file and serial file?
These lecture notes describe those file organizations in detail and compares and contrasts them: http://www.cim.mcgill.ca/~franco/OpSys-304-427/lecture-notes/node53.html
What is a indexed sequential file?
An indexed sequential file is a type of file organization where data records are stored sequentially in the order of key values. An index is maintained to help locate records quickly. This combination of sequential storage and indexing allows for efficient access to data in both sequential and random access patterns.
What is difference between sparse index and dense index?
Dense Index: An index record appears for every search key value in file. This record contains search key value and a pointer to the actual record. Sparse Index: Index records are created only for some of the records. To locate a record, we find the index record with the largest search key value less than or equal to the search key value we are looking for. We start at that record pointed to by the index record, and proceed along the pointers in the file (that is, sequentially) until we find the desired record. - - (ref: http://sawaal.ibibo.com/computers-and-technology/difference-between-sparce-index-dence-index-773764.html)
What are sequential access files?
The file(s) (data) which are accessed in a sequential or a orderly manner is called as a sequentially accessing a file.
Which file organization is most efficient for a file with a high degree?
sequential
Advantages of sequential file in c?
You don't have to bother with positioning in the file.
