The database system environment:
The DBMS is known as a complex software system.
Typical DBMS Component Modules:
The figure is divided into two halve. The top half of the diagram refers to the various users of the database environment and their interfaces. The lower half demonstrates the internals of the DBMS responsible for storage of data and processing of transaction.
The database and the DBMS catalogue are usually stored on disk. Access to the disk is principally controlled by operating system (OS). This includes disk input/Output. A higher point stored data manager module of DBMS controls access to DBMS information that is stored on the disk.
If we consider the top half of the figure it shows interface to casual users, DBA staff, application programmers and parametric users.
The DDL compiler specified in the DDL, processes schema definitions as well as stores the description of the schema in the DBMS Catalogue. The catalogue includes information such as names and sizes of the sizes of the files and data types of data of data items.
Storage particulars of every file mapping information among schemas as well as constraints.
Casual users as well as persons with occasional need of information from database interact using some of interface which is interactive query interface. The queries are parsed analyse for correctness of the operations for the model. The names of the data elements as well as therefore on by a query compiler that compiles them into internal form. The interior query is subjected to query optimization.The query optimizer is worried with rearrangement and possible recording of operations and eliminations of redundancies.
Application programmer inscribes programs in host languages. The precompiled take out DML commands from an application program.
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