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Tags: CTC move principle Tom brings the same work nbsp assignmentThe concept of database system was learned at school, and was uniformly indefinitely, and remained at the definition and certification level. Recently in the project, seriously understand the next database paradigm problem, only the subconscious understanding of its principles and applications to quickly design a reasonable table. First, clear concepts are as follows: The main code is also the primary key Candidate code if the val

|| TestDB || Zabbix |+--------------------+7 rows in Set (0.07 sec) At this point, MySQL's master-slave replication architecture was built successfully. Problems in setting up the configuration process:1. There was an unsuccessful connection to the main server side:MariaDB [(none)]> show Slave status\g;1. RowSlave_io_state:connecting to Mastermaster_host:172.16,75.1Master_user:repusermaster_port:3306Connect_retry:60master_log_file:binlog.000014read_m

Tags: upd access modify fetch number Submit name count Select Read DataMySQL describes two problems in 15.2.10.5, and gives the solution separately.1. Write the data to the child table, but before writing, make sure that its corresponding information exists in the parent table.It may appear that the data in the parent table has been read, but another request is deleted.Way: Begin; Select info from father_table where name = ' Nike ' LOCK in SHARE MODE;

Tags: nod cannot manipulate synthetic HTTP a person hub start typeproblem Description: a coupon activity, the user can collect coupons, but a coupon activity to receive a limited number of tickets, so users need to collect at the time must first count the number of coupons to receive. Then generate this coupon to collect records. Then there will be concurrency problems, when more than one user to collect the same coupon activity, they counted the numb

Label: Many people read the old Django version of the book, but installed a relatively new Django, so that in the use of the database has a lot of headaches, I am no exception, I do not want to let others continue to be tortured. Now I encountered some of the problems and solutions to the following: (My environment is a Linux terminal) first , the configuration of the database: 1. First, you must ensure that the database (MySQL) is installed on the t

(failure)ubuntu16.04 source compilation Rgbd_slam V2These days have been installed on the Ubuntu16.04 Rgbd_slam V2, but encountered two more major problems. I've been through a lot of options and haven't solved it.Leaving this record is a summary of these days.I. ubuntu16.04 installation of Rgbd_slam V2 tutorialThere are many such tutorials. But I still post a link to a tutorial.Please complete the tutorial before installing (because G2O is required f

Label:"Problem description": Previous time there is a project feedback, commonly used approval function sometimes slow response, multiple administrator features irregular client unresponsive situation, and once the administrator function is stuck, it will also affect the ordinary business users so that many users can not operate. The system is for mixed scenarios, the administrator function uses the CS client, and the business user is using the Web. "Environmental Information": Application Serve

The previous blog post described a number of system call functions, which, combined with accumulated experience, can be used to analyze and solve problems in the actual work.Problem: A Linux server in Hong Kong computer room, the above installed Sqlplus can not be connected to the Shenzhen company Room Oracle Server, the implementation of Sqlplus Xxxx/[email protected] time directly did not respond, after 2 minutes or so, reported:Sql*plus:release 11.

Label:This new demand to add folders, engaged in a few days finally understand a little, here and everyone to share the problems I encountered, I hope we can take less detours. Since our framework uses SSH, some of the SQL statements are not supported, only support HQL, so the first query two tables of some useful fields, one table is user_video_folder another table is user_video the two tables through union all for joint query, I have an article in

Recently, when I was learning spring, I encountered two minor problems and summarized1. Less lead on the required packageRun the test program and report the following error.Preliminary analysis, learned that the DataSource data source was not created successfully, the DataSource configuration file is wrong, or the property injection relationship is wrong.But do not have the properties file configuration, also also reported wrong, and then down analysi

Recent refactoring in the game of the same logic, but also to add new functional logic, because of the various naming problems, using namespace to control.However, the use of namespace in the Unity3d engine is different from the general one, which needs to be noted:The script to be a component component cannot be placed under namespace because the script name of the component is the same as the class name (that is, Xxxx.cs is consistent with xxxx:mono

Design patterns are the embodiment of design principles. In the world, the legend is martial arts cheats, summed up some of the fixed routines, programming the "Sunflower Treasure Book." personal opinion, the design principle is followed in the programming process, and the design pattern is used for reference. Completely follow the routines, sometimes rather simple problems complicate.The common patterns and their scenarios are as follows.1) Single ca

Java web has been a relatively weak piece, today deliberately in MU class to learn JSP video, in the actual hands of the process encountered a problemThe superclass "Javax.servlet.http.HttpServlet" is not found on the Java Build PathThis problem is very good to solve, Baidu a bit to find the reason, here is mainly to record their own problems encountered, convenient yourselfSince the error is that the Java build path can not be found, then right-click

JNI is an interface between Java and C/s + + programming, which makes it easy to implement Java calls to C + + languages. Specific use methods, there are many tutorials on the Internet, do not do too much introduction. This blog only focuses on common issues in the process of using JNI.1. Generate header file with command: Javah*.classThis is wrong. Running the above command prompts: Java.lang.IllegalArgumentException:Not a valid class Name:SegNative.class error. The cause of the error is the sa

There are a few problems with installing Linux to a physical machine with a U-disk: The U-disk plugs into the computer to start the installation results always prompt ACPI:WORKAROUND: When the system boots into the first item, press the TAB key and enter Acpi=off 2. When the third step is installed, the monitor is directly black screen.Workaround: Linux does not support discrete graphics cards, plug the VGA cable into the integrated vide

When I joined the Blue Bridge Cup, I found that most of the problems could be brute force. So this time I would like to summarize:General solution to the problem of full permutation, for example: (no repetition of all permutations) (with repeated selection) (the question of selecting m number from n number and then arranging)Here I try to summarize:For example general questions like to ask 1-9 how many kinds of full arrangement, then the code is as fo

file. 2. If you select context files, a new XML file is created, with only the context attribute in it, and the file is automatically named by the project name . 1.server.xml Add the context attribute to the%tomcathome%\conf\ Server.xml file 2.Context files Create an XML file with the project name, Project.xml placed in%tomcathome%\conf\\ Catalina\localhost Directory of files only context properties. Here are some of the problems I have encountere

Stability Problem of sorting algorithmBefore the written test, the interview, has been asked about the common ranking algorithm stability model problem, sometimes often is more choice, although have seen a lot of such problems, but each time is not allowed. In this summary, I hope to gain some.First of all, the stability of the sorting algorithm should be known, popularly speaking is to be able to guarantee the sort,2 equal numbers of the sequence and

Problems encountered in building the Python automation framework process based on 76572411:One, the lack of test kits: The test set code is as follows, will run all the E:\Software\sichuantest\test\case directory and test_*.py matching use casesImportUnitTest fromUtils. HtmltestrunnerImportHtmltestrunnerImport Time#Note When using a suite, use the (class name ("Method name") for multiple use cases in a single py file.#Import multiple py classes under,

Closures are powerful, but the results are often unexpected if the concept of closures is not properly understood. For example, here is a more common question No matter which div we click, the feedback is the content of the 4th Div. The reason for this is that each div's Click event forms a closure with the test method, and each div's Click event shares the same closure scope chain. When the event is triggered, the subscript represented by the variable i is already pointing to the 4th Div. There