International Journal of Computer Science and Mobile Computing (IJCSMC)
In data mining outliers are one of the main threats for efficient information retrieval from databases. Outliers are also known as anomalies. Mining of outliers from the normal data is very important and scope of this is very high. Anomaly detection can be found in applications such as credit card fraud detection, intrusion and insider threat detection in cyber-security, detection of fault, or malignant diagnosis. Anomalous data present in database is harmful for the processing of information and usage of that information. Viscous data contain erroneous information and it may contain dangerous code for carking the whole system where it is stored.