DATA MINING

                                Data Mining is the process of making data accessible for various users from data warehouse. while collecting data in a data warehouse it is very important to make that data usable for all the peoples who need that data.the data which is stored in data warehouse is all about the statistical analysis and all experiences abut an organization so this type of data is very important for new business mans.

Process Of Data Mining
 

                                      The above diagram shows all the stages including in data mining process.This stages are illustrated below:-
Stage 1- Selection
                         This stage is includes all selection process regarding data that is to be selected for further processing as per requirement from the data warehouse.It does not contain any personal information about any organization but it should contain all business regarding information.
Stage 2-Preprocessing
                         This sage is second stage of data mining process it includes all sorting of data in particular parts as per requirement and transfer data to next stage.
Stage 3-Transformation
                         This is third stage of data mining process it transforms data for further processing of data mining.
Stage 4-Data Mining
                         This includes process of sorting of all data in various patterns as it is needed to access by a user. It also arrange data under various topics or taglines as it is convenient to accessed by users.
Stage 5-Interpreation And Evaluation
                         This stage take care of all the collected data to be present in the form of knowledge in front of users. Knowledge is shared by this last stage of data mining process.

Techniques of data mining
                      There are various techniques of data mining that are listed below.This techniques are mostly used in data mining process :-
1. Decision Tree
2. Association
3. Classification
4. Clustering
5. Prediction
6. Sequential Pattern

Data Warehouse

                                                    DATA WAREHOUSING


Data Warehouse is a nothing but a system that is used to maintain database of various types  of sources that are for example marketing sector, sales,etc. This is also used to maintain more data that is analysed by various data sources. Data Warehouse provides flexible access to data in particular manner by which the user can access data.It is also refers to combination of databases contrast with data mart. data mart is collection for databases that provides access to particular user for there business skills in a single approach.This also provides a special historical data maintenance which is useful for newest businessmen s.
                                           

       
                                         Above  diagram in dictates about the data transmission for storing in data warehouse data sources A,B and C are connected to ETL that is stands for Extraction Transformation Loading this is placed at the middle of data warehouse and other databases this is also provides transmission, staging, interaction of data and access layer to the house.
the databases A,B and C are nothing but the operational systems.after data warehouse there is data mart & strategic mart are also connected this are access layers to get data out to user by this strategic mart & data mart data from data warehouse is get to the user after analysis in this way data warehousing is worked.

Computer Network Topologies

             Computer Networking is  a set of devices connected in a particular media links.A device can be a computer,printer or any other device that is able to send or receive data on the network.The links connected in devices are called Communication channels.Also computer networks are used for data communication.There are five basic components of data communication Massage, Sender, Receiver, Medium & Protocol.Network allows to share access information devices.
               The way a network is laid out, either physically or logically is refers as Topology. Topology are divided in five types:-

                                                                                 

                      By using this Topology we can transfer data from one system to another system.Apart from this there is an another topology name is Hybrid Topology, this topology is combination of all topology connected with each other.In this topology there is signal transmission this transmission of signal is known as Transmission Modes.There are three transmission modes Simplex, Half duplex, Full duplex which are described in the form of diagram below:-

Transmission Modes

Computer Virus

 

Computer virus representation(abstract)

              A computer virus is nothing but a malicious code that replicates itself again and again in a specified manner.A computer virus commonly comes in a system when an email attachment is downloaded from our email account this will replicates all the contents of our attachment and some times corrupt the file before opening it.

               Virus is a term that stands for "Vital Information Resources Under Seize" this means a computer virus is runs without wishes of user and corrupt over all system files or impotent documents on the systems memory.

                The overall memory is occupied by the virus and hard disk may be corrupted because of viruses. There are various types types of viruses listed below:-

1. Boot sector viruses
2. Traditional file viruses
3.  Document or macro viruses
4. 32-bit file viruses
5. Worms
6. Trojan horses