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What is object identity?
An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
Deletion Anomalies: Loss of important Information: In some cases, useful information may be lost when a tuple is deleted. For instance, if we delete the tuple corresponding to stu
How persistent programming languages differ from traditional programming languages? Database languages vary from traditional programming languages in that they directly manipul
When is a transaction rolled back? Any changes that the aborted transaction made to the database must be uncompleted. While the changes caused by an aborted transaction have be
Define data model? A data model is a collection of conceptual tools for explaining data, data relationships, data semantics and consistency constraints.
What is known as a search key? An attribute or set of attributes used to look up records in a file is known as a search key.
Draw an EER diagram that captures the "is-a" hierarchy of students in another simple database. The database captures both the "basic" information (say, student ID and student name)
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
Why, generally does an object-oriented system use the relational DBMS? The reasons for using relational DBMS for OO systems could be any combination of following: a. Many or
explain cascading rollback
What are the benefits of prepared statements and place holders? Parameter binding operations automatically handle escaping of characters Encourage Statement reuse
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