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Explain the Static or conservative Two Phase Locking:
Static (or conservative) Two Phase Locking: In this type of scheme, all the data items are locked earlier than any operations on them and are released just only after the last operation carried out on any data item.
X(X)
X (Y)
Read (X)
Write (X)
Read (Y)
Y = Y+N
Write Y
Unlock (X)
Unlock (Y)
In static 2PL, requests from other transactions for data items locked by the previous transaction will be delayed without need, so causing a serious impact on system performance.
Describe different steps of the object-oriented design process. The broad steps of the object-oriented design process are: a. Define context and modes of use of the system
What are the advantages of DBMS ? 1. Centralized Management and Control - One of the major advantages of using a database system is in which the organization could exert, thr
In how many parts events are classified Events are classified as four types in UML 1. Signals 2. Calls 3. Passing of Time 4. Change in State
Data Redundancy -A lot of information is being repeated in the relation. For instance, the information that MCS-014 is named SSAD is repetitive, address of Rahul is "D- 27, Main ro
Explain the θ-join and equijoin Refer tables Car and Boat which list models of cars and boats and their relevant prices. Assume a customer wants to buy a car and a boat, but sh
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State the functional approach of object oriented methods Moving from a functional approach to an object oriented one needs a translation of functional model elements into objec
Super keys of a relation can have extra attributes. Candidate keys are minimal super key, i.e. such a key have no extraneous attribute. An attribute is known as extraneous if even
Indexed (Indexed Sequential) File Organisation It organises the file like a big dictionary, i.e., records are kept in order of the key but an index is stored which also allows
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