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Differentiate between strict two-phase and rigorous two-phase with conversion protocol
Ans: Strict two-phase locking holds all its exclusive that is write locks until commit time, one time granted. When Rigorous two-phase locking is more restrictive as compared to standard 2PL in that it enforces the rule that no locks can be released through a transaction until after it commits or aborts. The former locks all its items previous to it starts thus once transaction starts, it is in its shrinking phase while latter does not unlock any of its items until after it terminates to the transaction is in its expanding phase till it ends.
Explain sorted File with advantages? Sorted file The sort utility shall perform one of the subsequent functions: 1.Sort lines of all the named files together and write the
Illustrate the Deployment Diagram A deployment diagram shows all nodes on network, their processor execution and interconnections. In a dynamic model, this is used to represen
Conflicting Operations in Schedule: The three simple ways of interleaved instruction implement of transactions T1 and T2. Please note that in the following tables the first col
In order to keep pace with competitors, Space Ltd has decided to implement an ERP system in order to replace its old legacy and manual systems. Management does not have much knowle
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
The data of a view is not physically stored, but derived from one or more tables. True the data of a view is not physically stored
What is difference between TRUNCATE and DELETE? - Truncate can't be rolled back whereas Delete can be. - Truncate keeps the lock on table whereas Delete keeps the lock on ea
A super key is an attribute or set of attributes used to recognize the records uniquely in a relation. For instance, in the Relation PERSON defines earlier PERSON_ID is a super
What is the difference between WHERE and HAVING clauses?. Predicates in the WHERE clause applies to every tuple while the predicate in the HAVING clause applies to groups.
Give an example of enforcement in Typing. You can understand the idea of enforcement as it makes sure objects of dissimilar classes may not be interchanged as below: Exampl
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