Summary File I/O on Microsoft Windows can be synchronous or asynchronous. The default behavior for I/O is synchronous, where an I/O function is called and returns when the I/O is complete. Asynchronous I/O allows an I/O function to return execution b…

2019-08-19T09:27:33.225584+08:00Slave encountered ORA-27090 exception during crash recoveryRecovery slave process is holding some recovery locks. Killing the instance now.2019-08-19T09:27:33.225736+08:00Errors in file /home/u01/app/oracle/diag/rdbms/…

操作系统是CentOS 5.11 数据库 10.2.0.5.0 晚上查看数据库,发现数据库报错查看相关的trace文件内容如下: *** SERVICE NAME:(SYS$BACKGROUND) 2017-12-23 20:48:16.958 *** SESSION ID:(363.1) 2017-12-23 20:48:16.958 *** 2017-12-23 20:48:16.958 Start recovery for domain 0, valid = 0, flags = 0x1…

Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]"DefaultDomainName"="HI""DefaultUserName"="Hello""LegalNoticeCaption"="""LegalN…

In a previous post Should I expose asynchronous wrappers for synchronous methods?, I discussed "async over sync," the notion of using synchronous functionality asynchronously and the benefits that doing so may or may not yield. The other directi…

Python之路,Day9 , IO多路复用(番外篇)   同步IO和异步IO,阻塞IO和非阻塞IO分别是什么,到底有什么区别?不同的人在不同的上下文下给出的答案是不同的.所以先限定一下本文的上下文. 本文讨论的背景是Linux环境下的network IO. 一 概念说明 在进行解释之前,首先要说明几个概念:- 用户空间和内核空间- 进程切换- 进程的阻塞- 文件描述符- 缓存 I/O 用户空间与内核空间 现在操作系统都是采用虚拟存储器,那么对32位操作系统而言,它的寻址空间(虚拟存储空间)为4…

Posted by Shiv Kumar on 23rd February, 2011 The Asynchronous Programming Model (or APM) has been around since .NET 1.1 and is still (as of .NET 4.0) the best/recommended solution for asynchronous I/O. Many people go down the route of using a multi-th…

Asynchronous programming can be tricky for beginners, therefore I think it’s useful to iron some basic concepts to avoid common pitfalls. For an explanation about generic asynchronous programming, I recommend you one of the many resourcesonline. I wi…

http://www.ibm.com/developerworks/linux/library/l-async/?S_TACT=105AGX52&S_CMP=cn-a-l Introduction to AIO Linux asynchronous I/O is a relatively recent addition to the Linux kernel. It's a standard feature of the 2.6 kernel, but you can find patches…

Doc ID 428681.1 Applies to: Oracle Database - Enterprise Edition - Version 10.2.0.1 to 11.2.0.1.0 [Release 10.2 to 11.2]Information in this document applies to any platform. Goal The goal of this note is to provide steps to add, remove, replace or mo…