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q several cpus provide for more than two modes of operation what are two probable uses of these multiple modesanswer although most systems merely
q some untimely computers protected the operating system by placing it in a memory partition that couldnt be modified by either the user job or the
q which of the subsequent instructions should be privilegeda read the clockb clear memoryc set value of timerd issue a trap instructione turn off
q how does the distinction among kernel mode and user mode function as a rudimentary form of protection security systemanswer the distinction among
q what is the major difficulty that a programmer should overcome in writing an operating system for a real-time environmentanswer the major
q we have stressed the require for an operating system to make efficient use of the computing hardware when is it suitable for the operating system
q list the four steps that are essential to run a program on a completely dedicated machineanswera reserve machine timeb manually load program into
q what are the major differences between operating systems for mainframe computers and personal computersanswer in general operating systems for
q what are the three major purposes of an operating systemanswer to offers an environment for a computer user to execute programs on computer
timestamps for read operationsif ts t lt w-timestamp q then the transaction t is trying to read a value of data item q which has already been
timestamp ordering protocola timestamp is a tag that can be attached to any transaction or any data item which indicates a specific time on which the
q explain the random key distributionthe triple key management mechanisms ensure a better and complete security solution using the random key
q attacks on wireless networkwsn are vulnerable to attacks which compromise the integrity of the wsn nodes by decreasing the nodes fault tolerance
explain growing phase of lockinggrowing phase in this phase the transaction can only obtain locks but cannot release any lock the transaction enters
depending upon the rules we have found we can classify the locks into two typesshared lock a transaction might be acquiring shared lock on a data
q develop a completely secure wsn based on the triple keywireless network is the most vulnerable type of network to security attack unauthorized
lock based protocola lock is nothing but a mechanism that tells the dbms whether a particular data item is being used by any transaction for
what is a transaction a transaction is an event which happens on the database generally a transaction reads a value from the database or writes a
multilevel index the multilevel index is a modification of the secondary level index system in this system we might be use even more number of levels
what is secondary indexwhile making the index generally the index table is kept in the primary memory ram and the main table because of its size is
primary indexin primary index there is a one-to-one relationship among the entries in the index table and the records in the major table primary
what is an indexan index is a small table having only two columns the first column has a copy of the primary or candidate key of a table and the
fifth normal form 5nfthese relations still have a difficulty while defining the 4nf we mentioned that all the attributes depend upon each other
fourth normal form 4nf when attributes in a relation have multi-valued dependency further normalization to 4nf and 5nf are needed let us first find
boyce-code normal form bcnfa relationship is said to be in bcnf if it is already in 3nf and the left hand side of each dependency is a candidate key