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Describe the term- State Diagram
State Diagram: An object could receive a sequence of the input instructions. The state of the object can differ depending upon sequence of input instructions. If we draw diagram that will represent all processes (input) and their output (states) then that diagram is called as state diagram. Processes are represented by arrow symbol and states by oval symbol. For illustration, screen of an ATM machine has many states such as main screen state, process transaction state, request password state.
write-set(T): Each data items that are written by a transaction T
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
give some example real-life situations where DBMS are most suiitabe
define lock conversion
Describe DROP TABLE command of SQL along with both the options - CASCADE and RESTRICT. DROP TABLE command - This command drops the specified table. Dropping a table also dro
Question: (a) List four disadvantages of the File Processing System as compared to the Database Systems. (b) The integrity of a database is enforced by integrity rules. One
Can we delete data element, which is being used by table fields. No we cant delete data element.
Improved availability: The data in a distributed system may be replicated so that it is at more than one site. Thus, the failure of a node or a communication link does not necessar
The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.
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