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In some scenarios, if there are problems with the host in the RAC environment, such as hardware failure, we need to store the startup database as soon as possible, and restore the business, then we need to migrate the previous RAC environment to the

Base Connection Pool class:Package Com.yl.sys.dao;Import Java.io.InputStream;Import java.sql.Connection;Import java.sql.SQLException;Import java.util.Properties;Import Java.util.Vector;public class Connectionpooltool {Private vector pool;Private

1. What is the difference between using the weak keyword and comparing assign?2. How do I use the Copy keyword?3. What is the problem with this notation: @property (copy) Nsmutablearray *array;4. How do I make my own class use the copy modifier? How

Objective-C Analysis1. Introduction I have been engaged in IOS development since today, and then PHP development to better understand development. Objective-C is the prerequisite for IOS development. This article briefly summarizes its knowledge

Bash Shell and bashshellI,Terminal Printing [Root @ cai ~] # Echo welcome to bash! Welcome to bash!   [Cairui @ cai ~] $ Echo 'Welcome to bash! ' Welcome to bash!   [Cairui @ cai ~] $ Echo "welcome to bash \! " Welcome to bash \! (Note: special

Oracle classic Q & A list [common] Oracle classic Q & A list [common] Directories01. What is the initial password after oracle is installed?02. What is the initial Default

In the end of the second phase of the Canton Fair Internship, and ushered in a few days of leisure, continue to learn Linux. In the previous essay on Linux learning CentOS (17)--some important commands related to Linux file and directory management,

1, who is the father of PHP. P What is the difference between Rasmus Lerdorf, Loedorf 2, $name and $ $name? P $name is a variable, the $ $name is a reference variable, such as: $name = ' sex '; $ $name = ' male '; Then $sex = ' male '; 3, how to

One year for a small company, let's take a look at what the front-end of a small company can do. One year's front-endPreface Yesterday, I took a day off to test subject 3. As a result, the first frame was hung on the light which was not completely

Author: Yan xujing With the increasing employment difficulty and high work pressure in recent years, more and more post-80s are seeking for sustenance in marriage. Due to the narrow circle, the dating tide has come back. However, the "post-80" view