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Evaluate:
a.When transactions T1 and T2 are in a deadlock, one of the transactions will eventually implement to completion and let the other one continue implementation.
b. When an inform to the database takes place, the time of the update, the values of the data previous to and after the update, and the type of lock used are recorded in the transaction log.
c. To restore a database using the instant update approach, both undo and redo operations may be essential, while with the deferred update approach only redo operations are used.
Write short notes on relational model The relational model uses a collection of tables to show both data and the relationships between those data. The relational mo
employee(empid,empname,dept,telno,mobno, add,sssno,tinno,WEdates,WEcomp,WEadd,WEpos,WEres) this is a employee record which is need to be normalize.the WE means work experience
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Consider the relations: PROJECT(proj#,proj_name,chief_architect) EMPLOYEE(emp#,emp_name) ASSIGNED(proj#,emp#) Use relational algebra to express the subsequent queries: (i) Get
Describe integrity constraints? Integrity Constraints - A database is just as excellent as the information stored in it, and a DBMS must therefore help avoid the entry of inc
#explain five disadvantages of a dbms..
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What was the method in which records are physically stored in a specified order according to a key field in each record ? A method in which records are physically stored within
Explain the rules for creating a labelled precedence graph for testing view serializability. Ans: A schedule S is view serializable if it is view equivalent to a ser
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