The first copy is performed by the DMA engine, which reads file contents from the disk and stores them into a kernel address space buffer. 直接内存存取(directmemoryaccess,DMA)引擎执行了第一次拷贝(参见图1),它从磁盘中读取文件内容,然后将它们存储到一个内核地址空间缓存区中。
Direct access device file control block 直接存取设备文件控制块
The Method of Direct Access to Database File Using Low-grade File Function 用低级文件函数直接存取数据库文件的方法
Generally, such transaction processing systems call for direct access file. 一般来说,这些事务处理系统要求直接存取文件。
A direct access inventory file seems a reasonable choice. 直接存取货单文件似乎是个合适的方案;
Open Systems and Mainframes content with storage devices through SAN. In virtue of the direct access faculty of SAN, the system can have the great I/ O performance closed to local file system. 系统采用双网络型架构:将开放平台和大型机通过SAN网络连接存储设备,借助SAN的直接存储访问能力,系统可以拥有接近本地文件系统的存储访问性能;
This paper introduces the design& implementation of a parallel file system based on direct data access, and gives out the primary functions and key technologies of parallel file system. 该文介绍了一种基于直接数据访问的并行文件系统的设计和实现,阐明了该并行文件系统具备的主要功能及解决的关键技术问题。
The Record-addressable random access file ( RARA) is a new-type file in FORTRAN. It combines the advantages of the sequential and direct files, and provides a more efficient means for the users in their record unequal in length in the random access file. 记录可寻址随机访问文件是一种新型FORTRAN文件,它集中了顺序与直接文件两者的优点,为用户随机访问文件中不等长记录提供了更为有效的手段。
Having analysed the architecture of dBASE ⅲ database file, the paper introduces a general method and an implementation routine for the direct access to and operation on dBASE ⅲ database file in high-level lan-guage thus providing an effective and practical approach to data sharing. 本文在分析dBASEⅢ数据库文件结构的基础上,给出了用高级语言直接访问和操作数据库文件的通用方法和具体实现的程序,具有实际应用价值,为数据共享提供了有效途径。*
Direct access which stores the binary in the database directly with the temporary file for transition is the developing direction of the binary of the database management. 直接存取将二进制数据直接存入数据库中,存取过程均以临时文件过渡,是数据库管理二进制数据的发展方向。