icnd1 practice

distance calculation.There are two common types of MongoDB geolocation indexes: 1) 2d planar coordinate index, which is suitable for plane-based distance calculation. 2) 2dsphere Geometric sphere index, suitable for spherical geometry distance operation. The pursuit of absolute precision, should choose 2dsphere. However, when the coordinate span is not too large (for example, within 2000 km), the distance difference calculated by these two indexes is almost negligible. About MONGODB implementat

The Nobel nobel prize winnerWe continue to practice simple forms of SQL enquiry.This tutorial is for the Nobel Prize winner:Nobel (yr, subject, winner) yr subject winner 1960 Chemistry Willard F. Libby 1960 Literature Saint-john Perse 1960 Medicine Sir Frank Macfarlane Burnet 1960 Medicine Peter Madawar ... Yr

Now on the internet can see a lot of articles about SEO, also have a lot of webmasters to share their SEO experience, for novice webmaster, there are many opportunities to learn what you want, but today I share with you a few points of view, may be that they come to find it, I have always believed that only practice can be true , because each person's website is different, the profession is different, the hand resources are different, the method is al

manipulate all the tables on the server.--The user address can be localhost, or it can be an IP address, a machine name, and a domain name. You can also use '% ' to indicate connections from any address.--' connection password ' cannot be empty, otherwise the creation failed. Password The password set by the representative; Example Grant all the permissions for all tables of all databases to the IP for any value user named Test password for PWD GRANT all on * * to ' test ' @ '% ' identified by

Original: SQL Server Enterprise Platform Management Practice reading Notes--sql Server How to set autogrow and auto-shrink itemsSQL Server allows the user to set the database initial and maximum values, which can be configured by auto-grow or auto-shrink. With these configurations, we can prevent application modifications that could be caused by database space problems, or when SQL Server disk space is exhausted. In general, if the database is not ver

Oracle Practice Exercises 1.0February 10, 2017 Friday 9:07:221, list the IT industry database types and user distribution2. List some products commonly used by Oracle Company3. Brief description of Oracle database software, databases, instances, and their presence4, through the data dictionary and parameter query database each component5. Enumerate some common directory structure of Oracle software6. Enumerate the log directory structure of Oracle7, d

keep your site from attack. Choose a good CDN Accelerator service to the site's SEO not only have no impact will also help. We are doing site SEO time or more from the site's user experience to do, so that our site more secure, stable and fast. Speaking of which, presumably we have a certain understanding of the CDN technology, that CDN for SEO is there any impact? Here thanks to the next Kin-yu (http://www.jianyu87.com/2011121160.html), Kin-yu Students for everyone to test, After half a mont

Tags: Practice left outer connection man Ieft join ORACL Insert values base inf1. Insert a record into Scott's EMP table Insert into Scott.emp (empno,ename,job) VALUES (9527, ' EAST ', ' salesman '); 2. Scott's EMP Table left Outer Connection Dept table Select E.empno,e.ename,e.job,d.deptno,d.dname From Scott.emp E left join Scott.dept Don e.deptno = D.deptno; Results: 3. Scott's EMP Table right outer connection Dept table Select E.empno,e.ename,e.jo

Tags: mysql master-slave replication principleMySQL Master-slave replicationMySQL supports unidirectional two-way chaining cascading real-time asynchronous replication, where one server acts as the primary server (master) during replication, while one or more other servers act as slave servers (Slave)MySQL master-slave replication application Scenario1, the master-slave server for each other backup2, master-slave server read-write separation share site pressureRead/write separationMedium and lar

lot of useless.. Lack of industry practice referenceMany times in China are based on the BMC, HP and other models to build a model library, but in fact, the idea of foreigners and people are very different, often will make too complex model system.. Model adjustment Too cumbersomeWith a relational database, each type of attribute in the model is a column, and the final adjustment is always to use development, the completion of an adjustment takes 2 d

Original: SQL Server Enterprise Platform Management Practice book Notes--sql Server database file allocation method1, file allocation methods and file space Check methodThe most common commands for checking data files and table sizes are: sp_spaceusedThis command has three defects: 1, the use of each data file and log file is not visible. 2, this stored procedure relies on the SQL Server stored in some system views of the spatial usage statistics calc

Label:This article has been redirected from an excessive number of Oracle Dblink connections (Ora-02020)Today, when dealing with data synchronization issues, it is necessary to synchronize data from several other DB servers to a single target repository, in the following way: Dblink+job, however, Ora-02020 errors occur during the write process compilation. As follows: Environment: Target server (alias: DB) Other servers that need to be synchronized (DB1, DB2, DB3, DB4, DB5)

=============================================================================VI/VIM Command Review and Practice:---------------------------------------The Command mode yy copies the contents of the line where the cursor is located 4yy the copy cursor is located on the line starting with the 4 line of content p paste dd Delete/cut the contents of the line where the cursor is located 2DD Delete/The cut cursor is located on the line where the 2-row cont

. Examples of Use : MySQL InnoDB as an example Or take the previous example to lift: the commodity goods table has a field Status,status 1 for the product is not under the order, status is 2 for the product has been put orders, then we have to order a product to ensure that the product status is 1. Suppose the product has an ID of 1. The order operation consists of 3 steps: 1. Check out the product information Select (Status,status,version) from T_goods where Id=#{id} 2. Generate orders based

The environment used in this practice is CentOS 7.Reference: http://www.xuebuyuan.com/1472808.htmlOpenGL Development Environment Setup:1.OPENGL Library InstallationOpenGL Library using the Mesa library, install the command:Yum Intall mesa*Mesa Library is an open-source three-dimensional computer graphics library that implements the OpenGL application interface in the form of open source. Specific description: https://www.mesa3d.org/intro.html.2.glut I

Original: Redis Advanced Practice II How to install Redis on Linux systems I. Introduction Previous article wrote "How to install a VMware Pro virtual machine" and install the Linux operating system on a virtual machine. That was the first step, and with the Linux operating system, we were able to install Redis on that system. Starting with the first article, this is also my official start to learn Redis journey. Talking about Redis, has been exp

field as long as the method is proper. To prove this, he chose a project that traditional women are not good at, that is, chess. As a result, he and his wife trained both their three daughters as masters of the world of chess, which is the famous Three Sisters of polga. This experiment even proves that even if you do not like this field, you can be trained as masters in this field, because one of the three sisters does not like chess very much. The bad news is that it takes a long time to becom

//compilation Environment: vs2013 32-bit WIN8 operating system#include #include #include usingStd::cout;usingStd::endl;classA{intx =0; Public:A ();~a ();Private:};A::a (){}A::~a (){}intMain (){Std::tupleint,float> t;//This will call a ()Std::vector1);//This will call a ()Std::list1);//This will call a ()cout Get1> (t) //0cout Get2> (t) //0GetChar ();return0;}C + + Practice recording the initialization of T in 1--vector

data:imagedatas) {renderimage (data);//working with pictures } } Catch(Interruptedexception |executionexception e) { //TODO auto-generated Catch blockE.printstacktrace (); } }}This execution strategy still has limitations, because running heterogeneous tasks in parallel does not get good performance. Only a large number of independent and homogeneous tasks can be processed concurrently to achieve real performance gains.3. Third Way: Using the Completionservice pa

/* Copyright (c) 2014, Yantai University School of Computer * All rights reserved. * File name: Test.cpp *: Liu Chang * completion date: 2014 months * Version number: v1.0 * * Problem Description: Using pointer access, from the keyboard to the array a[n] input n data (n less than 100), Then the value of the element is stored in reverse order and then output. * Input Description: A total of n+1 integers, enter the n value first, and then enter n integers; * Program output: n integers that ar