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What is the meaning of Recovery?
In deferred update methods, if a transaction fails before arriving its commit point, it will not have altered the database in any way, so UNDO is not required. Deferred update can lead to a recovery algorithm termed as NO-UNDO/REDO. This approach, while used with certain concurrency control methods, is designed never to need transaction rollback, and recovery simply contain redoing the operations of transactions committed after the last checkpoint from the log. In immediate update method, if a transaction fails after recording a few changes in the database but before reaching its commit point, the effect of its operations on the database should be undone; that is, the transaction should be rolled back. This technique needs both operations and is utilized most often in practice. Hence, it is as well known as UNDO/REDO.
What are the difference between clustered and a non-clustered index? A clustered index is a special type of index that reorders the way records in the table are physically stor
a. Define the term "deadlock". There are four conditions that must hold before deadlock is possible. Name them. b. Outline an algorithm that detects whether there is a deadlock.
Define Boyce codd normal form A relation schema R is in BCNF with respect to a set F of functional dependencies if, for all functional dependencies in F + of the form.α ->β.
State about the Activity Diagram Activity diagrams show flow from one activity to other. It is an ongoing non atomic execution within a state machine. Activity finally results
Find out the names and company names of all employees sorted in ascending order of company name and descending order of employee names of by which company. SELECT EMPLOYEE_NAME,
wrie a report on whether a BSc n information systems develops the skills required by employers in Database administration
Hierarchical model is also known by? A hierarchical model is also known as a Tree structure.
1. Staff (staffID --> availabilityID) 2. Services (servicesID --> itemBasedID --> timedBasedID) 3. TimedBased (timedbasedID--> priceid) 4. Clients (clientId, serviceId-->
I need solution of the question posted at http://www.expertsmind.com/questions/sql-query-for-testing-triggers-and-stored-procedures-30140149.aspx
i want notes on this topic
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