DBMS Architecture, Before Knowing concerning info, should be having a Knowledge about What is DBMS and What is Database and What is RDBMS.
DBMS Architecture :
The Database Management System (DBMS) design by architecture and it is fully depend on that. The basic client or server architecture is used to large number of PCs, and many of Computers or Devices and web servers, database servers and other components also that are connected via networks. The client or server architectures are consist of many PCs or device and a workstation which is connected with the network. DBMS architectures are depending on how users are connected to the database to get their request done from that.
Types of DBMS Architecture :
Here DBMS Architecture is three type like,
- In 1-tier architecture, the database is directly available for the users, That means the users can directly use it on dbms.
- If Any changes done there, that will directly be done on the database, that means It doesn’t provide a handy tool for end users as well.
- The 1-Tier architecture is used to development purpose on the local application and where programmers can directly communicates with the database for getting the quick response.
- The 2-Tier architecture is same like basic client or server. In the two-tier architecture, applications on the client end can be directly communicates with the database on the server side. For example, API’s like: ODBC, JDBC are used for it.
- On it The user interfaces and application programs are run on the client-side as well.
- The server side is also responsible to provide the functionalities as well, like: query processing, transaction management.
- For communicate with the DBMS, client-side application is establishes a connection with the server side as well.
- The 3-Tier architecture is contain another layer between the client and server, so In this architecture, client cannot be directly communicate with the server.
- In The application on the client end interacts and an application server which is further communicate with database system.
- End user have no idea about existence of the database beyond an application servers. The database also have no any idea about other users beyond the applications.
- The 3-Tier architecture is used to case of large web application as well.
Three schema Architecture :
- The three schema architecture is called ANSI or SPARC architecture or three-level architecture.
- This framework is used to describe the structure of a particular database system.
- Three schema architecture is used to separate between the user applications and physical database.
- The three schema architecture is contain three-levels and It breaks the database down into three different categories which details given below.
The three-schema architecture follows:
Internal Level :
The internal level has an internal schema that describes the physical storage structure of the database and It uses the physical data model.
Example : B-Trees, Hashing , Specification of primary and secondary keys, indexes, pointers and sequencing, Data compression and encryption techniques and Optimization of internal structures.
Conceptual Level :
The conceptual schema to describe the design of a database at the conceptual level and Conceptual level is also called logical level. Programmers and database administrators can work at this level.
External Level :
In the external level, a database has contain several schemas which is sometimes called as subschema and The subschema is used to describe the different view of the database. An external schema is also called view schema.
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