基于相变存储器和闪存的数据库事务恢复模型  

Transaction Recovery Model of Databases Based on PCM and Flash Memory

作　　者：范玉雷[1] 孟小峰[1] 

机构地区：[1]中国人民大学信息学院,北京100872

出　　处：《计算机学报》2013年第8期1582-1591,共10页Chinese Journal of Computers

基　　金：国家自然科学基金(61070055;91024032;91124001);核高基重大专项基金(2012AA010701;2013AA013204);中国人民大学科学研究基金(11XNL010)资助~~

摘　　要：随着闪存容量不断增大、价格不断下降,闪存在实际存储系统上得到了越来越广泛的应用.但是,闪存的页级读写、异位更新、有限寿命等阻碍了闪存数据库系统的性能提升,尤其是事务恢复.闪存的异位更新使得影子页技术可以很好地支持闪存数据库事务恢复,同时也给闪存数据库带来新挑战,如事务管理、缓冲区管理.相变存储器凭借其比闪存更高的读写速度、更小的读写粒度、更长的寿命成为了下一代主流存储技术,所以相变存储器可以用于解决在闪存数据库中使用影子页技术所产生的事务管理和缓冲区管理问题.该文基于相变存储器和闪存混合式存储提出一种全新的数据库事务恢复模型——SPFP.该模型充分利用相变存储器的特性完成事务管理.为支持非强制缓冲区管理,基于SPFP提出了一种优化的数据库事务恢复模型——SPFLP,利用相变存储器记录更多事务信息.实验结果表明,相较于全闪存存储的数据库系统,SPFLP大大提高了基于混合存储的数据库事务处理性能.The capacity and the cost of flash memory are being advanced and reduced continuously,so they are more and more widely used in the actual storage systems.But the unique characteristics of flash memory,such as page-level read/write,out-of-place update,limited lifetime,hinder promoting the performance of flash-based database systems,especially transaction recovery.Because of out-of-place update of flash memory,shadow paging technology can be adopted to support transaction recovery in flash-based DBMS,but new challenges are brought,such as transaction management and buffer management.Because of the unique characteristics of Phase Change Memory（PCM） such as higher read/write speed,smaller grain size of read/write,more durable than flash memory,PCM,as one of the most promising next-generation memory technologies,can be used in transaction management and buffer management when shadow paging technology has been adopted in flash-based DBMS.Based on hybrid storage of PCM and flash memory,this paper presents a new recovery model for databases,SPFP,which exerts advantages of PCM for managing transaction.For supporting no-force buffer management,we propose an optimized transaction recovery model,SPFLP,which records more transactions’ information in PCM.Our preliminary experiments show that there is a bigger improvement of SPFP and SPFLP in transaction processing performance of databases based on PCM and flash memory in comparison with these based on flash memory.

关 键 词：闪存 相变存储器 数据库 事务恢复 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]