PG CREATEINDEX CONCURRENTLY [TOC] 官方说法 根据9.1的文档 Creating an index can interfere with regular operation of a database. Normally PostgreSQL locks the table to be indexed against writes and performs the entire index build with a single scan of the table…
基于优先级的抢占式调度及实验的源程序和实验步骤 1 实验目的 1.学习并验证基于优先级的抢占式调度2 实验内容 在实验一建立的 project 中,创建3 个任务,对这三个任务使用基于优先级的抢占式调度.观察运行结果. 3 实验设备及工具 1.硬件: a) PC 机 2.软件: a) PC 机操作系统Windows2000 或windowsXP b) Tornado2.24 实验原理 Wind 内核调度默认使用基于优先级抢占式调度.每个任务有一个…
本实验的网站链接:mit 6.828 lab1 Exercise 3. 题目 Exercise 3. Take a look at the lab tools guide, especially the section on GDB commands. Even if you're familiar with GDB, this includes some esoteric GDB commands that are useful for OS work. Set a breakpoint at…
本实验链接:mit 6.828 lab1 Exercise2. 题目 Exercise 2. Use GDB's si (Step Instruction) command to trace into the ROM BIOS for a few more instructions, and try to guess what it might be doing. You might want to look at Phil Storrs I/O Ports Description, as we…
实验内容: (一) 授权 . 以dba用户的身份登陆oracle,创建用户u1+学号后四位,u2+学号后四位. SQL> create user u1_3985 identified by "; SQL> create user u2_3985 identified by "; SQL> create user u3_3985 identified by "; SQL> create user u4_3985 identified by ";…