Journal of Digital Information Management Ahmad Al-Qerem, Ala Hamarsheh, Shadi Nashwan 15 5 2017 http://dline.info/fpaper/jdim/v15i5/jdimv15i5_4.pdf This paper addresses a new optimisticbased concurrency control protocol, called OCC-Mix. The proposed protocol could be used to reduce the scars wasting and expensive resources of mobile environment. This can be achieved by avoiding the unnecessary mobile transaction restarts. Consequently, a dynamic adjustment of serialization order in the conflicting transactions with respect to the validating transaction will be used. As a result, much resources of mobile environment are saved and a many fixed host transactions finished their execution without being affected by other mobile transactions. The performance of the proposed protocol was measured along with other related CC protocols; the simulation results show that the performance of these protocols is consistently much better than the traditional 2PL and OCC protocols in mixed transaction environments.