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Recovery Techniques:After Reading the types of failures and database errors, let us talk about how to recover from the failures. Recovery can be complete using/restoring the previous consistent state (backward recovery) or by moving forward to the next consistent state as per the committed transactions recovery (forward recovery). Please note that a system can recover from software and hardware failures by using the forward and backward recovery only if the system log is intact. What is the system log? We will talk about it in more detail, but first let us describe forward and backward recovery.
Describe log based recovery The most usably structure for recording data base modification is the LOG the log is a sequence of log records recording all the update activities i
A constraint named less_than_20 was defined on the field date_of_birth of table student. Delete this constraint. ALTER TABLE student DROP CONSTRAINT less_than_20;
Explain ODBC? ODBC - Open DataBase Connectivity (ODBC) enable the integration of SQL along with a general-reasons programming language.
What are the two distinct aspects to the implementation of associations? i) It is required to define data declarations which will enable details of actual links to be stored. I
Why did SAP introduce the extended star schema? Explain why it is reported to be better than the traditional schema model?
explain three types of internet risks to the consummers whent he business system is data dependent. how can we minimise these risks
Which is an advantage of view? The Advantages of view is Data security, Derived columns and Hiding of complex queries
notes about update opreation
Define query optimization. Query optimization refers to the process of search the lowest -cost method of evaluating a given query.
Explain the cartesian product in Database Management System
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