DBMS必须提供机制。 并发控制机制是衡量一个DBMS性能的 重要标志之一。 并发操作带来的数据不一致性(不控制或控制不当) (lostupdate) (dirtyread) (non-repeatableread) 数据不一致 ——(a)丢失修改 T 1 T 2 读A=16 A←A-1 写回A=15 读A=16 ...
Much like a concurrent signal assignment, a concurrent assertion statement is a process that gets (re-)activated by an event on any signal present in the assert expression. The difference is that an assertion is neither intended to schedule any new transaction nor capable of doing so. As they...
A predicted error is accompanied by a schedule, which is enforced in the program to manifest the error. The approach has been evaluated for deadlock and data race detection, and compared with other dynamic approaches. While maintaining or increasing precision, between 50% and 86% fewer false ...