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lossless-join decomposition let us show an intuitive decomposition of a relation we require a better basis for deciding decompositions since
attribute preservationthis is a easy and obvious necessity that includes preserving all the attributes that were there in the relation that is being
desirable properties of decompositiondecomposition is a process of dividing a relation into its projections that will not be disjoint please remind
higher normal forms is there more normal forms beyond bcnf yes though these normal forms are not based on the concept of functional dependence more
boyce-codd normal form bcnfthe relation newstudent enrolmentno sno sname cname cno has every attributes participating in candidate keys as all the
the second normal form 2nfdefinition a relation is in 2nf if it is in 1nf and each non-key attribute is fully dependent on each candidate key of the
the first normal form 1nflet us first describe 1nfdefinition a relation table is in 1nf if1 there are no duplicate tuples or rows
single valued normalisation codd in the year 1972 formed three normal forms 1nf 2nf and 3nf these were based on functional dependencies between
fds in relationships enrols relationship none as it is many to manyteaches relationship course code rarr instructorinstructor rarr course codethe
fds in entitiesstudent entity fds in entitiesstudent entity
a specification of a function toarr is given belowfunction toarrn in int s in stack of int return in array of int pren ge 0postthe returned value is
single-valued dependenciesa database is a collection of related information and it is therefore inevitable that some items of information in the
insertion anomaly inability to show certain information-the primary key of the over relation be enrolment number cno any new tuple to be inserted in
cost savingbetter performance scalability and viability translates into saving for website operators because
update anomaly this anomaly is occurred due to data redundancy redundant information makes updates more complex since for example varying the name of
data redundancy-a lot of information is being repeated in the relation for instance the information that mcs-014 is named ssad is repetitive address
domain constraintsdomain constraints are primarily formed for defining the logically correct values for an attribute of a relation the relation
high availabilityoracle web cache supports content aware load balancing and fail over detection the features
foreign keys and nulllet us take the relation deptdept
performancerunning on inexpensive hardware oracle web cache increase the throughput of website by several orders of
the are various limitations of employing wireless lan technology in any multistory building in middle of melbourne or any other big city arebullrange
as configuring of vlans helps in controlling the size of broadcast domains there are some key components of inter-vlan routing such as vlan capable
many benefits of configuring vlan as listed belowbullperformance enhancements it reduces heavy load on the network by permitting operations at lower
vlan virtual local area network is a concept of creating distinct broadcast domains it is a network which aims at partitioning the physical network
mospfmospf is multicast extension to ospf this protocol is extension of ospf which is a unicast routing protocol which make mospf a combination of