In a database management system (DBMS), sequential file organization is a popular method of file organization. It’s a straightforward approach to file organization. This method organizes the data elements into a sequence that is arranged in a binary format, one after the other.
In this article, we will dive deeper into Sequential File Organization in DBMS according to the GATE Syllabus for (Computer Science Engineering) CSE. Keep reading ahead to learn more.
Table of Contents
- What is Sequential File Organization in DBMS?
- Methods of Sequential File Organization
- Sequential File Organization Pros
- Sequential File Organization Cons
What is Sequential File Organization in DBMS?
This is the most straightforward technique of file arrangement. Files are saved in this method in sequential order.
Methods of Sequential File Organization
There are two approaches to implementing this method:
1. Pile File Method
It’s a straightforward procedure. In this method, we store the records in sequential order, one after the other. The record will be entered in the same order as it is inserted into the tables.
When a record is updated or deleted, the memory blocks are searched for the record. When it is discovered, it will be marked for deletion, and a new record will be added in its place.
Insertion of the New Record:
Assume we have four records in order, R1, R3 …. R9, and R8. As a result, records are nothing more than a table row. If we wish to add a new record R2 to the sequence, we’ll have to put it at the end of the file. Records are nothing more than a row on a table.
2. Sorted File Method
The new record is always added at the end of the file in this approach, and the sequence is then sorted in descending or ascending order. Records are sorted using any primary key or other keys.
If a record is modified, it will first update the record, then sort the file, and then store the revised record in the correct location.
Insertion of the New Record:
Assume there is a pre-existing sorted sequence of four records, R1, R3 … R9, and R8. If a new record R2 needs to be added to the sequence, it will be added at the end of the file, and then the series will be sorted.
Sequential File Organization Pros
- It includes a way of dealing with large amounts of data that is both quick and efficient.
- Files can be stored easily in this fashion using less expensive storage mechanisms such as magnetic cassettes.
- It has a simple design. The data and info can be stored with comparatively little effort.
- This approach is used when a large number of records must be accessed, such as when calculating a student’s grade or generating a wage slip.
- This strategy is employed in the creation of reports and statistical calculations.
Sequential File Organization Cons
- It will waste time because we cannot go to a specific record that is requested; instead, we must proceed in a sequential manner, which consumes time.
- Sorting records in a sorted file approach consumes more time and space.
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