The simplest way to protect data is to copy all the database files to another place. In case of a problem, you can overwrite these files to the original location for recovery and then start the database, such an operation is called full (or all) Consistent database backup and recovery. Here, we note that consistent Database Backup usually refers to cold backup (Closing the database). In this situation, data files, redo logs, and control files are marked with the same SCN number.
Sections 3rd and
Example 1, 2, 3 and bcnf paradigm
Author: That cloud Source: blog Park Release Date:Reading: 317 Original article links [
Database DesignIs the specification that needs to be met by the database design. databases that meet these specifications are concise and clear in structure. At the same time, insert, delete, and update will not occur) operation exception. O
This series of articles mainly introduces the knowledge of commonly used algorithms and data structures, records the contents of "Algorithms i/ii" course, adopts "algorithm (4th edition)" This Red Cookbook as a learning material, language is java. I don't have to say much about the fame of this book. Watercress Rating 9.4, I myself also think is an excellent learning algorithm books.
With this series of articles, you can deepen your understanding of data structures and basic algorithms (indi
Hardware condition:
IP: 192.168.12.48
Software conditions:
Mysql-cluster-gpl-7.0.9-win32.msi, installation directory: D: \ Program Files \ mysql server 7.0
!!! All subsequent directory settings will be based on the installation directory location !!! For more information about directory settings, see the subsequent configuration file. You must ensure that the directory is valid and exists in advance during your experiments!
Management node configuration file:
Simply put: Layer-1 switchOnly physical layer protocols are supported (one phone-controlled switch can be called ???)L2 SwitchSupports physical layer and data link layer protocols, such as Ethernet switches.L3 SwitchSupports physical layer, data link layer, and network layer protocols, such as some switches with routing functions. In terms of the ISO/OSI hierarchy, switches can be divided into L2 switches and L3 switches. A layer-
1. Use the while statement
1 using System; 2 class Sum100 3 { 4 static void Main() 5 { 6 int Sum, i; 7 Sum = 0; i = 1; 8 while (i
2. Do-while statement
Reprinted from: Cardiac Note (http://493420337.iteye.com/blog/593981)--------------------------------------------------------------------------------------------------------------- --------------------------------------------------Chomsky divides the method into four types, namely, type 0, 1, 2 and type 3. The concept of these types of grammar must be mastered an
Output an M * n matrix arranged according to the following rules.1 6 72 5 83 4 9
Analysis: The key is to find out the matrix rules. on the Internet, the analysis is as follows:
Set behavior I, column J
1 2 M 2 m + 1 4 M 4 m + 1
Question 21: programming, input two integers n and m, from Series 1, 2, 3 ,...... N is random, so that the sum is equal to m. All possible combinations are required. It is actually a backpack problem. Solution: 1. First, determine that if nm is used, the number of n greater than m cannot be involved in the combination,
Xception:
Here we have a picture of a Scottish barrel, especially my favorite Scotch whisky, Lagavulin. Xception correctly classifies this image as "buckets".The last example is to classify using VGG16:
A few months ago, when I finished the game of the Wild Hunt, I took this photo of the monitor. VGG16 's first prediction was "home theater", which was a reasonable prediction because there was a "TV/monitor" in the top-5 forecast.As you can see from the examples in this article, the
["1", "2", "3"].map (parseint) Get what? The answer is: [1, Nan, Nan]. Cause: parseint receives two parameters, and map passes 3 parameters. The map function defines : Arr.map (Callback[,thisarg]);The callback function requires the following
In the PHP language, for digital characters and numbers how to participate in the operation, in specific cases will be determined, for example: echo "3+4+5"; Results: 3+4+5. Because it is treated as a string. When echo1+2+ "3+4+5", it is treated as an expression. This involves the problem of different data type operati
-2", subject = subjects [0]}, new book {Title = "C # on Rails", publisher = Publishers [1], authors = new [] {authors [2]}, pagecount = 256, price = 35.5 M, publicationdate = new datetime (2007, 4, 1 ), ISBN = "0-222-77777-2", subject = subjects [0]}, new book {Title = "all
Js implementation is similar to add (1) (2) (3) method of calling
This article mainly introduces the js implementation method similar to add (1) (2) (3). If you need it, refer
The Code is as follows:
Var add = function ()
Three: Oc--1. The creation and use of NSString,1, create a constant string, and note the "@" symbol.NSString *astring = @ "This is a string!"; The following is a constant, preceded by a pointer variable2,nsstring *s1 = [NSString new];//no meaningS1 [email protected] "jian le ma";3, the third method of creating a stringFormat creates a string (creates a string in
Displays the representation of the expression 1*2+3*4+...+99*100 (takes the form of an interaction)The program source code is as follows:1 /*2 June 8, 2017 08:03:383 function: Output The following expressions in an interactive form4 */5#include"stdio.h"6#include"string.h"7 8
,} $ /;Return regu. test (str );}/*Purpose: Check whether the entered mobile phone number is correct.Input:S: StringReturn Value:If the verification succeeds, true is returned. Otherwise, false is returned.*/Function checkMobile (s ){Var regu =/^ [1] [3] [0-9] {9} $ /;Var re = new RegExp (regu );If (re. test (s )){Return true;} Else {Return false;}}/*Purpose: Check whether the input string conforms to the p
the same physical LAN into different broadcast domains on L2 switches based on actual application needs, users with the same requirements or services are in the same broadcast domain, while users with different needs or services are in different broadcast domains.
On a L2 Switch without any Vlan, any broadcast frame is forwarded to all ports except the acceptor port. After a Vlan is configured, when a port belonging to a Vlan receives a broadcast frame, the switch must follow the following prin
as hardware raid, and features are not as good as hardware raid.
Next we will introduce various RAID technologies
I. RAID 0
The band technology is used to write data in parallel on multiple disks in bytes or bits (the starting offset of each disk is the same, and the subsequent segments of a certain number of bytes, i/O read/write performance can be improved, but it does not have data redundancy like raid1. Once the hard disk fails, it will be done. The structure is as follows.
Ii. Raid
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