Big Data is the field of database management system that has been used for data collection at large levels. Millions of records have been stored on the big data servers that are indexed properly. The relation between various data instances has been built so that access to the particular data must be easy. Due to vast large value of data big data has various challenges that have to be overcome. These challenges are scalability, availability, security and confidentiality. In this paper various challenges has been discussed that cause various issues in utilization of big data concept.