Input / Output It should also provide an interface between the devices and the rest of the system that is simple and easy to use. 于是乎这里就有了对于硬盘等IO设备的抽象. 5.1 PRINCIPLES OF I/O HARDWARE 5.1.1 I/0 Devices            I/0 devices can be roughly divided int…

No one can do all things, learn to be good at use what others already did. Most computers have two modes of operation: kernel mode and user mode. The OS is the most fundamental piece of software and runs in kermel mode(also called usperivosr mode). I…

DEADLOCKS Both processes are blocked and will remain so forever. This situation is called a deadlock. 6.1 RESOURCES 6.1.1 Preemptable and Nonpreemptable Resources Resources come in two types: preemptable and nonpreemptable. A preempt-able resource is…

https://kb.iu.edu/d/agjv Short for "Portable Operating System Interface for uni-X", POSIX is a set of standards codified by the IEEE and issued by ANSI and ISO. The goal of POSIX is to ease the task of cross-platform software development by esta…

1 Protection Profile Introduction   This document defines the security functionality expected to be provided by a general-purpose operating system capable of operating in a networked environment. It also provides a set of assurance components that de…

Chapter 0 第0章 Operating system interfaces 操作系统接口 The job of an operating system is to share a computer among multiple programs and to provide a more useful set of services than the hardware alone supports. The operating system manages and abstracts t…

我们一个SQL Server服务器在执行YourSQLDBa的作业YourSQLDba_FullBackups_And_Maintenance时遇到了错误: Exec YourSQLDba.Maint.ShowHistoryErrors @JobNo = 1227 <row> <ctx>yMaint.IntegrityTesting</ctx> <Sql>DBCC checkDb('xxxx') </Sql> <err>In case…

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在新UAT服务器上,需要将tempdb放置在SSD(固态硬盘)上.由于SSD(固态硬盘)特性,所以tempdb的文件只能放置在D盘下面,而不能是D盘下的某一个目录下面. ALTER  DATABASE tempdb MODIFY FILE(name='tempdev', filename='D:\tempdb.mdf') ;   GO   ALTER  DATABASE tempdb MODIFY FILE(name='templog', filename='D:\templog.ldf') ;…

这篇博文主要演示"CREATE FILE encountered operating system error 5(Access is denied.)"错误如出现的原因(当然只是导致这个错误出现的一种场景而已)和如何解决这个问题以及一些不解的迷惑.   实验环境: 操作系统版本: Windows Server 2012 SP2 数据库的版本:Microsoft SQL Server 2014 - 12.0.2000.8 如下所示,SQL Server Database Service…