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Define the Two Phase Locking Protocol
This is a protocol that is used to make sure serializability of transactions. This protocol needs that every transaction issue lock and unlock requests in two phases:
Growing Phase: A transaction may acquire locks, but may not release any lock.
Shrinking Phase: A transaction may release locks, but may not acquire any new locks. Basically, a transaction is in growing phase. The transaction obtains locks as required. Just one time the transaction releases a lock, it comes in the shrinking phase, and it can issue no more lock requests. Two-phase locking makes sure conflict serializability, but does not make sure freedom from deadlock.
What is E-R model? This data model is based on real world that having of basic objects called entities and of relationship between these objects. Entities are explained in a da
Explain the B + tree? B + tree is a type of tree which denotes sorted data in a way that permits for efficient insertion, retrieval and removal of records, each of which is
Explain degree of relation? Degree of a Relation - The degree or arity of a relation is the number of attributes n of its relation schema.
Describe how you can simplify Operations. To simplify operation, one should use inheritance, where possible to use, to reduce the quantity of distinct operations. Introduce new
Explain the two types of participation constraint. Total: The participation of an entity set E in a relationship set R is said to be total if each entity in E participates i
design a generalization specialization hierarchy for a motor vehicle sales company. the company sells motorcycles, passenger cars, vens and buses.
Make SQL statements for the following scenarios. Your response should contain SQL statement, output and any other assumptions you have made to arrive at the answer. For Colorado cu
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
how to connect vb.net with access
What is meant by computing the closure of a set of functional dependency? The closure of F denoted by F + is the set of functional dependencies logically implied by F.
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