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Data Manipulation Language
Data manipulation language (DML) describes a set of commands that are used to query and change data within existing schema objects. In this case commit is not implicit that is alters are not permanent till explicitly committed. DML statements having of SELECT, UPDATE, INSERT and DELETE statements.
Control as State within Program 1. The term control exactly means to check effect of input within a program. For illustration, in Figure, after the ATM card is inserted (a
What is storage manager? A storage manager is a program module that gives the interface among the low level data keeps in a database and the application programs and queries su
Determine the Three Views of Data We know that the similar thing, if viewed from dissimilar angles produces difference sights. Similarly, the database that we have formed alrea
Why containment is important in oosystems? Containment is an significant concept in oosystems because it allows dissimilar users to view data at different granularities.
What is a heterogeneous distributed database? In a heterogeneous distributed database, dissimilar sites may use different schemas, and dissimilar dbms s/w. The sites may not be
What is key ? Key - A single attribute or a combination of two or more attributes of an entity set which is used to recognize one or more instances (rows) of the set (table) is
What are the types of storage devices? Primary storage Secondary storage Tertiary storage Volatile storage Nonvolatile storage
What is the aim of logical schema ? The main motive of the logical schema is to ensure the portability of procedures and models on various physical schemas at runtime.
Discuss deferred update technique of recovery. What are the advantages? Ans: The deferred update methods do not physically update the database on disk till after a transact
In order to keep pace with competitors, Space Ltd has decided to implement an ERP system in order to replace its old legacy and manual systems. Management does not have much knowle
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