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What are the DBMS languages? Briefly explain?
Data Definition language (DDL):A database schema is specified through a set of definitions expressed through a special language called data definition language. For instance, the subsequent statement in the SQL describes the account table
Create table account (account_number char(10), balance integer)
Execution of the above DDL statement creates the account table. DDL permits a user to specify storage structure and access techniques used through the database system as well as specify certain consistency constraints such as balance of an account should on fall below Rs1000.
Data Manipulation language (DML): A data-manipulation language (DML) is a language which enables users to access or manipulate data as organized through the appropriate data model.
There are basically two types:
1) Procedural DMLs needs a user to specify what data are required and how to get those data. 2) Declarative DMLs (also referred to as nonprocedural DMLs) need a user to specify what data are required without specifying how to get those data.
Define DBA database administrator? DBA : A database administrator (DBA) is a person who is responsible for the environmental aspects of a database. In common, these involves:
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Why are cursors necessary in embedded SQL? A cursor is an object used to store the output of a query for row-by-row processing through the application programs. SQL statements
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need a DBMS system on any data for assignment.
Define Deadlock prevention These protocols make sure that the system will never enter a deadlock state. There are two methods to deadlock prevention. One approach makes sure t
a. Construct a query around any one of the functional divisions you made in 4a such that if executed in the distributed design of 4 would require reconstruction of at least two ho
Haw does it work one database application
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