Mirjalol Tavasharov Independence work of English Theme: Database Teacher

3.Database in our world..
Connolly and Begg define a database management system (DBMS) as "a software system that allows users to define, create, maintain, and control access to a database." Examples of DBMS include MySQL, PostgreSQL, Microsoft SQL Server, Oracle Database, and Microsoft Access.
The abbreviation DBMS is sometimes extended to refer to the basic database model, with DBMS for relational, OODBMS for object–oriented and ORDBMS for object-relational model. Other extensions may indicate some other characteristics, such as DDBMS for distributed database management systems.DBMS functionality can vary greatly. The main functionality is data storage, retrieval and updating. Codd proposed the following functions and services that a full-fledged general-purpose DBMS should provide:

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  Storing, retrieving and updating data
  
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  A user-accessible catalog or data dictionary describing metadata
  
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  Transaction and concurrency support
  
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  Database recovery tools in case of damage
  
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  Support for access authorization and data updates
  
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  Support for access from remote locations
  
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  Applying restrictions to ensure that the data in the database conforms to certain rules
  

It is also usually expected that the DBMS will provide a set of utilities for such purposes as may be required for effective database administration, including import, export, monitoring, defragmentation and analysis utilities. The main part of the DBMS that interacts between the database and the application interface is sometimes called the database engine.
Often DBMS have configuration parameters that can be statically and dynamically configured, for example, the maximum amount of main memory on the server that the database can use. The trend is to minimize the amount of manual configuration, and for cases like embedded databases, the need for zero administration is paramount.
Large corporate DBMS tend to increase in size and functionality and may require thousands of human years of development effort throughout their lifetime.