System Health Check inspects system general health through whole operation present condition analysis for each component of operating system of company. This is system diagnostic. System diagnostics are divided into sectors ,OS part, N/W part, database part, Transaction processing & application part etc., that can be performed and The performing range can include the analysis of movable status in large to that of causes for the system error at least. Also, system diagnostic can be used as basic data of Performance Tuningbecause of deducing wrong compositions or weak points about efficiency of each part.