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Isolation or Independence: The isolation property shows that the updates of a transaction should not be visible till they are committed. Isolation assurance that the progresses of other transactions do not affect the outcome of this transaction. For instance, if another transaction that is a withdrawal transaction which withdraws an amount of Rs. 5000 from X account is in progress, While commits or fails, should not affect the outcome of this transaction. Only the state that has been study by the transaction last should verify the outcome of this transaction.
Define the terms entity, attribute, role and relationship between the entities, giving examples for each of them. Ans: Entity: An entity is a "thing" or "object" in th
What are the problems if one were not to normalize? When do these problems surface? Ans: Database normalization, sometimes considered to as canonical synthesis, is
When a function module is activated syntax checking is performed automatically. YEs, a function module is activated syntax checking.
Decompose the table with the following description and functional dependencies into a set of equivalent tables normalized to 3NF or BCNF. A long-standing international treaty am
What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
Assume that you are responsible for selecting a new DBMS product for Sohar Hospital
Consider the subsequent relations along with keys underlined Street (name, location, city) House (number, street_name) Lives (name, house_number) Define the above relations
Define entity integrity and referential integrity. How does SQL allow specification of these? Ans: Entity Integrity Rule- If the attribute A of relation R is a prime attribut
Represent the following scenarios with E-R diagrams drawn using the ER Assistant software. The diagrams should indicate cardinality and optionality of relationships. Transform each
Explanation on Data Sharing?
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