关键词: 网格, 实时数据库, 事务管理, 并发控制机制, 事务影子

Abstract: According to the characteristics of real transaction in grid, this paper focuses on grid real-time transaction model and methods of concurrency control, and a concurrency control protocol at transaction level (GSCC) that adapts the real-time transaction in grid is proposed by improving speculative concurrency control (SCC) protocol. This protocol extends the transaction’s type to reduce conflicts between transactions, dynamically establishes the maximum of shadow to reasonably use the resources of system, simplifies the shadow’s quantity to reduce the cost of system, and adds the quasi-commit phase to avoid unnecessary restarting and enhances the concurrency of trans-action. The experimental results show that this protocol is feasible and effective, and can meet the needs of grid real-time transaction.

Key words: grid, real-time database, transaction management, concurrency control mechanisms, transaction shadow