Explain components of database in detail.

Explain components of database in detail.
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2 Answers

Answer :

Components of a DBMS: 

(i) Query processor: The query processor transforms user queries into a series of low level instructions. It is used to interpret the online user's query and convert it into an efficient series of operations in a form capable of being sent to the run time data manager for execution.

(ii) Run time database manager: Run time database manager is the central software component of the DBMS, which interfaces with user-submitted application programs and queries. It handles database access at run time. It converts operations in user's queries coming. It accepts queries and examines the external and conceptual schemas to determine what conceptual records are required to satisfy the user’s request. It enforces constraints to maintain the consistency and integrity of the data, as well as its security. It also performs backing and recovery operations.

(iii) Authorization control: The authorization control module checks the authorization of users in terms of various privileges to users.

(iv) Command processor: The command processor processes the queries passed by authorization control module. 

(v) Integrity checker: It checks the integrity constraints so that only valid data can be entered into the database. 

(vi) Query optimizer: The query optimizers determine an optimal strategy for the query execution. 

(vii) Transaction manager: The transaction manager ensures that the transaction properties should be maintained by the system. 

(viii) Scheduler: It provides an environment in which multiple users can work on same piece of data at the same time in other words it supports concurrency. 

(ix) Data Manager: The data manager is responsible for the actual handling of data in the database. It provides recovery to the system which that system should be able to recover the data after some failure. It includes Recovery manager and Buffer manager. The buffer manager is responsible for the transfer of data between the main memory and secondary storage (such as disk or tape). It is also referred as the cache manger.
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Answer :

A database system involves four major components.

1. Data

2. Hardware

3. Software

4. Users


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