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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.
What are the object-oriented approaches Software systems which are designed with structured design methodology never support some of desired quality attributes for example reus
Types Of Indexes One of the words used during the file organisation is the term index. In this part, let us describe this term in more detail. We find the index of keywords
What is the main advantage of the object model? What are its different components? The object model focuses on the logical data structures. Each object model comprises of many
Illustrate the State model for the ATM class let us take state model for the ATM class given below in Figure showing state model of the ATM class and the pseudo code derived fr
What is a recursive relationship? Give an example not used in the text. A recursive relationship is a relationship among an entity and itself. For example, given the entity PER
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
Write short note on Events Events consist of inputs, interrupts, decisions and actions performed by any external device or users. Every event always has a sender and receiver.
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
WHAT IS DATABASE TECHNOLOGIES
Backward Recovery (UNDO): In this system the uncommitted changes made by a transaction to a database are undone. Instead the system is reset to the last consistent state of databa
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