The heterogeneity and autonomy make the task of ensuring global serializability in a MDBS environment difficult.
自制和异构为保证多库系统的全局可串性带来了困难。
2
Although serializability guarantees the correctness of concurrent access, it meanwhile causes lots of loss in concurrency and brings down the system throughput.
串行化在保证事务并发访问正确性的同时严重制约了分布式数据库的并发程度，。降低了系统效率。
3
Concurrency control and recovery techniques are used in conventional DBMS's to preserve the serializability and the permanence requirements of database transactions.