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2-Tier Architecture

चित्र
The 2-Tier architecture is same as basic client-server. In the two-tier architecture, applications on the client end can directly communicate with the database at the server side. For this interaction, API's like:  ODBC ,  JDBC  are used. The user interfaces and application programs are run on the client-side. The server side is responsible to provide the functionalities like: query processing and transaction management. To communicate with the DBMS, client-side application establishes a connection with the server side. Fig: 2-tier Architecture
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Database management system

चित्र
Database management system is a software which is used to manage the database. For example: MySQL, Oracle, etc are a very popular commercial database which is used in different applications. DBMS provides an interface to perform various operations like database creation, storing data in it, updating data, creating a table in the database and a lot more. It provides protection and security to the database. In the case of multiple users, it also maintains data consistency.
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Advantages of DBMS

Controls database redundancy:  It can control data redundancy because it stores all the data in one single database file and that recorded data is placed in the database. Data sharing:  In DBMS, the authorized users of an organization can share the data among multiple users. Easily Maintenance:  It can be easily maintainable due to the centralized nature of the database system. Reduce time:  It reduces development time and maintenance need. Backup:  It provides backup and recovery subsystems which create automatic backup of data from hardware and software failures and restores the data if required. multiple user interface:  It provides different types of user interfaces like graphical user interfaces, application program interfaces
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