Two-stage real-time transaction processing in mobile broadcast environments

MVOCC-MDA-2PV concurrency control protocol was proposed for mobile broadcast environments. Mobile real-time transaction processing is performed in two stages. In the first stage transaction processing is performed at MH (Mobile Host), and in the second stage at the server. At the MHs all mobile transactions perform pre-validation of transactions. The pre-validation process is carried out against committed transactions at the server in the last broadcast cycle. Transactions that survive in pre-validation in MH must be submitted to the server for final validation. The protocol can eliminate conflicts between mobile read-only transactions and mobile update transactions, and resolve data conflicts flexibly using multiversion dynamic adjustment of serialization order to avoid unnecessary restarts of transactions. Mobile read-only transactions can be committed with no-blocking. Respond time of mobile read-only transactions is greatly reduced. The results of simulation experiment show that MVOCC-DMA-2PV protocol performs better than other protocols.