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Define Deadlock prevention
These protocols make sure that the system will never enter a deadlock state. There are two methods to deadlock prevention. One approach makes sure that no cyclic waits can take place by ordering the requests for locks, or requiring all locks to be obtained together. The other method is closer to deadlock recovery, and carries out transaction rollback in place of waiting for a lock, while the wait could potentially result in a deadlock. In this approach two timestamp based methods are there: wait - die and wound - wait. In wait -die, the older transaction is permitted to wait if it needs data from older transaction. In wound - wait, the younger transaction is rolled back if it requires data from older transaction if older transaction requires data currently held by a younger transaction, though younger transaction is allowed wait if it requires data from older transaction.
Which component is not included in database environment ? A users component is not included in database environment.
i would like to ask if you will do assignment of database number of words 1500 and how much
What is a SELECT operation? The select operation selects tuples that please a given predicate. We use the lowercase letter σ to denote selection.
You are managing the following database system: • DBMS: Oracle 11g • OS: Sun Solaris • System architecture: Web-based application using ASP.Net • Purpose of Server: HR managem
Set Difference If R1 and R2 are two union compatible relations or relations then result of R3 =R1- R2 is the relation that have only those tuples that are in R1 but not in R2.
The following variant of the primary copy asynchronous-update replication protocol has been proposed for totally replicated systems. (a) A transaction executing at site A updat
Explain the three data models namely relational, network and hierarchical and evaluate their relative advantages and disadvantages. Hierarchical Model: In hierarchical model, da
A database is a set of data. But, is the data kept in a database trustworthy? To answer that query we must first answer the question. What is integrity? Integrity simply means t
Define the Query optimisation The query parser commonly generates a standard initial tree to correspond to an SQL query, with no doing any optimization. Such type of a canonica
A full discription of the new, a discription of its components, and the bebefit it will provide a company. A disscussion of the information usedin the system. A disscussion of any
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