pseudocode: if( getenv(“uboot_env_init”)  !=  NULL){ if(uboot_env_init  !=  HAVE_INIT){ Set uboot_env_init=1; Write to uboot_env partition; }else{ Means uboot env lost; Run restort_factory_env; }…

In AM335x the ROM code serves as the bootstrap loader, sometimes referred to as the Initial Program Loader (IPL)or the Primary Program Loader (PPL). The booting is completed in two consecutive stages by U-Boot [1] binaries.The binary for the 1st U-Bo…

Data Recovery Advisor The health monitor and the ADR The capabilities and limitations of DRA using the DRA Complete recovery from data file loss with RMAN Recovery in noarchive log mode Recovery in archive log mode Recovery from loss of noncritical f…

该类教程网上有很多,但是很多不全,给小白用户造成了很多困扰.我也是按照网上的教程刷了半天,才熟悉了是怎么个回事.这里整理成教程. 注意: 请看教程步骤走,不要跳跃性刷机.不懂的术语.软件,若本文无介绍,请自行搜索. 不希望看到"为什么刷不了?"."进不去刷机模式"等问题.本文纯属兴趣,无义务一一回答各位网友提的问题,但看到会不定时回复. 刷机有风险,出现问题自行承担! 机型:C301 CPU Atheros AR9344 rev 3内存 128MB DDR2闪存 M…

一般在升级过程,都会提示用户,请勿断电,不管是android的STB,TV还是PHONE,或者是其他的终端设备,升级过程,基本上都可以看到“正在升级,请勿断电”,然后有个进度条,显示升级的进度. 但是从系统安全的角度考虑,如果用户真断电了,我们仍然需要能够从异常掉电的情况中,恢复系统或者继续升级. 我们先理解下recovery的过程,我们升级过程,其实分为两个阶段,升级包校验过程,以及升级包更新过程: 2.1 校验过程掉电 在升级包校验过程,是recovery对升级包zip的完整性以及合法性进行…

GFS: Evolution on Fast-forward by Marshall Kirk McKusick, Sean Quinlan | August 7, 2009 A discussion between Kirk McKusick and Sean Quinlan aboutthe origin and evolution of the Google File System. During the early stages of development at Google, the…

Chapter 1. Fundamentals Prev     Next Chapter 1. Fundamentals 1.1. Request execution The most essential function of HttpClient is to execute HTTP methods. Execution of an HTTP method involves one or several HTTP request / HTTP response exchanges, usu…

http://hc.apache.org/httpcomponents-client-ga/tutorial/html/   Chapter 1. Fundamentals Prev     Next Chapter 1. Fundamentals 1.1. Request execution The most essential function of HttpClient is to execute HTTP methods. Execution of an HTTP method invo…

Chapter 1. Fundamentals Prev     Next Chapter 1. Fundamentals 1.1. Request execution The most essential function of HttpClient is to execute HTTP methods. Execution of an HTTP method involves one or several HTTP request / HTTP response exchanges, usu…

重新审视RDMA的网络支持 本文为SIGCOMM 2018会议论文. 笔者翻译了该论文.由于时间仓促,且笔者英文能力有限,错误之处在所难免:欢迎读者批评指正. 本文及翻译版本仅用于学习使用.如果有任何不当,请联系笔者删除. Abstract (摘要) The advent of RoCE (RDMA over Converged Ethernet) has led to a signifcant increase in the use of RDMA in datacenter networks…

RFC: 793 TRANSMISSION CONTROL PROTOCOL DARPA INTERNET PROGRAM PROTOCOL SPECIFICATION September 1981 prepared for Defense Advanced Research Projects Agency Information Processing Techniques Office 1400 Wilson Boulevard Arlington, Virginia 22209 by Inf…

Frequently Asked Questions (FAQ) Origins 起源 What is the purpose of the project? What is the history of the project? What's the origin of the gopher mascot? Why did you create a new language? What are Go's ancestors? What are the guiding principles in…

一. ORA-600 概述 Errorsof the form ORA-600 are called internal errors. This section clarifies themisunderstanding of ORA-600s being synonymous with corruption. An ORA-600 usually has up to five arguments associated withit which gives Oracle support and…

1:数据安装操作练习:考试题目 1: Creating a database & Server Configuration --[101]-- #创建数据库 1. Create the database #使用dbca创建一个PROD1数据库,包括Sample Schema,启用archivelog,没有EM. 1.1 Create a PROD1 database with dbca, including Sample Schema, enable archivelog, without EM…

1. Introduction 1.1. About 1.2. Sphinx features 1.3. Where to get Sphinx 1.4. License 1.5. Credits 1.6. History 2. Installation 2.1. Supported systems 2.2. Compiling Sphinx from source 2.2.1. Required tools 2.2.2. Compiling on Linux 2.2.3. Known comp…

In this post, I will give a list of all undocumented parameters in Oracle 11g. Here is a query to see all the parameters (documented and undocumented) which contain the string you enter when prompted: – Enter name of the parameter when prompted SET l…

https://mp.weixin.qq.com/s/nQOxsZUZSiPi7Sx40mgwsA 20181104 3 differences between Savepoints and Checkpoints in Apache Flink data-artisans Flink 昨天 This episode of our Flink Friday Tip explains what Savepoints and Checkpoints are and examines the main…

 下面是我总结的OCP教程的知识点.以备參考之用. 1, What's Oracle Server? ·         It's a database management system that provides an open, comprehensive, integrated approach to information management. ·         Consists of an Oracle instance and an Oracle database 2,What…

CUDA是NVIDIA的GPU开发工具,眼下在大规模并行计算领域有着广泛应用. windows平台上面的CUDA开发之前.最好去NVIDIA官网查看说明,然后下载对应的driver. ToolKits等等. 假设你下载最新版本号的CUDA7.0.里面事实上已经包括了driver及Tool kits. 特别要注意:目标最高版本号为CUDA7.0.仅支持64位系统(32位没法安装CUDA 7.0 Tool Kits).另外,VS编译平台最低要求是VS2010. So,那些依旧用VC6或者VS2008…

A novel massively parallel supercomputer of hundreds of teraOPS-scale includes node architectures based upon System-On-a-Chip technology, i.e., each processing node comprises a single Application Specific Integrated Circuit (ASIC). Within each ASIC n…

A computer system with read/write access to storage devices creates a snapshot of a data volume at a point in time while continuing to accept access requests to the mirrored data volume by copying before making changes to the base data volume. Multip…

建立逻辑路径 create or replace directory dumpdir as 'c:\'; grant read,write on directory dumpdir to scott; 倒入/出 expdp newdr/123456@hncrm directory=test dumpfile=test_score1.dmp logfile=tes t.log parallel=2 schemas=newdr 错误 ORA-00054 resource busy and acqui…

http://blog.chinaunix.net/xmlrpc.php?r=blog/article&id=4681351&uid=29655480 参考 1.百度文库中的收藏 2.51cto的视频课程 rac课程学习笔记 安装条件至少7个ip地址oel linux AS 6.x x86_64oracle 11.2.0.4pl/sql工具 实例与数据库两部分组成 数据库是磁盘上存储的物理文件的集合实例是预分配的内存与后台进程的集合 数据库包括:控制文件,日志文件,数据文件 还有参数文件,…

原文出处:http://www.fpga4fun.com/PCI-Express2.html Point-to-point architecture At 2.5Gbps, the PCI Express Gen1 line speed is a whopping 75 times faster than the 33MHz legacy PCI speed.How is that possible? only because PCI express is a point-to-point bu…

一.资源 1.网站推荐www.eda365.com,里面有很多有用的东西:当然还有官方代理商的网站http://www.pspice.com.cn/: 2.视频教程:有库源电气的视频教程,还有在www.eda-china.com(有个叫詹书庭的)中的视频教程,这两个视频都是讲的16.5版本的,当然还有于博士的讲的16.2版本的: 3.PCB的步骤和AD还有PADs都一样的,原理图→封装→布局→规则约束→布线→覆铜→生成Gerber: 4.Allegro资源汇总贴:http://www.eda36…

Libfilth使用说明 winshton 2009年2月 (*本文大部分翻译自libfilth,还有一部分是个人使用实践 *时间水平均有限,翻译的不完整,尤其第二章可以忽略) 版本历史修改记录 版本 作者 日期 备注 V1.0 winshton 2009-2-1 创建               目 录 版本历史修改记录    1 1. 概述    5 2. 库文件分析    5 2.1. filth.h/filth.c    6 2.1.1. quantize()    6 2.1.2. f…

10.7 Imagine a web server for a simplified search engine. This system has 100 machines to respond to search queries, which may then call out using processSearch(string query) to another cluster of machines to actually get the result. The machine whic…

体系结构图的学习: 老余服装店的故事 结构图: SQL查询语句 SGA 共享池shared pool 数据缓存区Buffer cache PGA 进程 SQL更新语句 SGA: 日志缓存区 日志文件 深入学习 提交 回滚 一致读 实践体会: 内存 进程 启停 文件 监听 学习意义: 体系结构图: 说明: oracle由实例和数据库组成 实例由:专门开辟出来的一块SGA内存区域和一些列后台进程组成,其中SGA主要被划分为共享池(shared pool),数据缓存区(db cache),日志缓存区(…

backup of a database is a very important thing. If no backup, meet the following situation goes crazy: UPDATE or DELETE whitout where… table was DROPPed accidentally… INNODB was corrupt… entire datacenter loses power… Data from the safety point of vi…

HttpClient can throw two types of exceptions: java.io.IOException in case of an I/O failure such as socket timeout or an socket reset and HttpException that signals an HTTP failure such as a violation of the HTTP protocol. Usually I/O errors are cons…