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Role of Databases In Information Systems
Databases and database management systems essay a crucial role in developing, operating, and managing information systems. DBMSs run behind the scenes of all information systems, and they act as an intermediary between a user & the database. DBMS interfaces with information systems to provide users with a single, integrated view of the data. They together help translate all requests into a series of operations necessary for information retrieval & fulfilling of requests.
Following are some critical roles played by DBMS in information systems:
- Better, Faster & More Resilient Data Access
- Stronger Relationships Between Data
- Better Data Security
Representing Data Using Logical Structures
Data structures form the skeletal framework of databases. They are fundamental for representing and storing data in databases, memory, and almost every other kind of storage area. And, data representation and manipulation remain two primary aspects of data structure programming.
Thus, Data Structures = Organized Data + Allowed Operations.
Data Structure Classifications
Data structures are generally classified into two categories:
Linear data structures where all data elements are arranged in a linear sequence. E.g., Array, Linked List
Non-linear data structures where the elements are not in a linear sequence, E.g., Tree, Graph
Linear Data Structures
Arrays represent a set of finite homogeneous elements. A single array must always contain the same kind of elements. They may be one-dimensional or two-dimensional and are typically accessed via loops.
A linked list is another type of linear data structure where each element is a separate object, called a node. Each node in a list comprises the data and a reference or pointer to the next node.
Non-linear data structures
A binary tree is a non-linear data structure where each node has two children, the left child and the right child.
Graphs are another type of non-linear data structure where the relationship between the parent node and children node is less restricted. Here, a single parent node can have numerous child nodes.
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