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Question:
One of the tasks a database management system must perform is to ensure that the data is still intact in the face of software and hardware failure. This task is known as recovery.
(a) Describe the three basic steps involved in recovery.
(b) Describe the three types of failure in a database system. Support your answer with appropriate example.
(c) Explain in details how you would recover from all the three types of the failure described above.
Which two files are used during operation of the DBMS? Data dictionary and transaction log are two files used during operation of the DBMS.
Using SQL create a view RS for the relations R and S. The view consists of the columns A and D renamed as X and Y in that order. Insert a tuple into it. Show the contents of t
Suppose an instruction takes 1 nanosecond to execute (on average), a page fault takes 20 microseconds of processor time, and it takes 300 microseconds of disk time to read or write
Rearrange the Execution Order for Efficiency Rearranging execution order for efficiency means executing such job that requires less execution time. By rearranging the object
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Consider the relations EMPLOYEE(emp#, name) ASSIGNED_TO(project#, emp#) PROJECT(project#, project_name, chief) Express the subsequent queries in Relational Algebra (i) Ge
Explain Data Sublangauges ? Data sublanguage: In relational database theory, the term sublanguage, first used for this purpose through E. F. Codd in the year of 1970, refers t
Hardware failure : Hardware failures are the failures when some disk or hardware chip fails. This may result in loss of data. One such trouble can be that a disk gets damaged and
What are audit trails? An audit trail is a log of all alters to the database along with information like which user performed the change and when the alter was performed.
Aggregation : One limitation of the E-R diagram is that they do not permit representation of relationships between relationships. In such a case the relationship along with its ent
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