causes of pvcs

, the system may think it is a new session conversation, but you cannot access the original sessions, so you need to turn on this option, which will cause session loss Reason 3: It seems that most of the session loss is caused by the client, so to start from the client to see if the cookie is open Reason 4: Session time setting is not a problem, will not cause loss due to timeout Reason 5: The number of cookies in IE (20 cookies per domain) may cause session loss Reason 6: Use the Web ga

One, the network exists the loop to cause the net speed to become slow This phenomenon rarely occurs when the number of nodes involved in the network is not many and the structure is not very complex. However, in some more complex networks, there are often redundant lines, such as inadvertently connected to form a circuit. For example, cable from the network Center to a computer room, and then from the computer room to the second room computer. At the same time from the network Center and a sta

Just bought when the boot time of 20 seconds will be able to boot, now is more and more slow, all need more than 1 minutes. is computer poisoning, or computer configuration too low? In fact, bad luck may be the reason, but most of the time we are in the process of using the computer gradually accumulated, the following examples of 7 more common causes of notebook startup slowed down. 1, network settings If you often need to put the notebook into th

causes to look at the Web page video card and the solution is as follows: 1, the Internet is too low, it is not appropriate to see high-definition video. If your broadband is within 4M, suggest a less-than-clear or SD video, not to see High-definition video. 2, the computer configuration is too low. Now the video site on the computer configuration requirements are more and more high, small part of the proposed computer configuration, minimum

When you use a computer, you can only enter Safe mode, when you click the file, there are many files are selected, the computer has not installed other software recently, you can troubleshoot software. This is the case when you use a computer before, because the keyboard sticky causes the mouse to click the file when you select multiple files. So all the "Ctrl", "ALT", "shift" keys are more than a few times, and then start again, the computer

Win7 lack of physical memory causes the computer to run very slowly how to do Workaround One: 1, usually you can in the system's taskbar blank area click the right mouse button, and then select the "Task Manager" option; 2, open the System Task Manager, click on the top of the "Performance" tab, you can see the current computer memory using a general situation. My computer is installed with Windows 7 system, computer memory is 1GB, and

Win7 System USB Disk poisoning causes folder to be hidden how to solve the virus We all know that our work can not be separated from U disk, as a tool to store files, the most headaches is a U disk virus, resulting in all the files inside are hidden, how to do? The method is as follows: Before you do so, make sure that the computer you are using is not poisoned, then click "Start" and choose "Run" from the pop-up menu, as shown in the f

Shell may command somewhat differently. For example, Aix ksh, there is no disown, but you can use the nohup-p PID to achieve disown the same effect.There is also a more powerful way to use screen, first create a disconnected mode virtual terminal, and then use the-r option to reconnect the virtual terminal, in which any command executed, can achieve nohup effect, This is convenient when there are multiple commands that need to be executed continuously in the background:$ SCREEN-DMS Screen_test

Label:PHP Version 5.4Nginx 1.62Nginx Error:2015/04/07 05:50:43 [ERROR] 1788#0: *413 FastCGI sent in stderr: "PHP message:php Parse error:syntax error, unexpected E nd of file in/data/bei123/class/functions.php on line 1246″while reading response headers from upstream, client:1x2.1x3. 1X7.1X7, server:xxx.xxx.8x.1x9, Request: "Get/http/1.1″, Upstream:" Fastcgi://127.0.0.1:9000″, Host: "1x2.1x2.x5.1x9″Workaround:Open the short label option in php.iniShort_open_tag=offChange intoShort_open_tag=onThe

/gravity/ Center "width=" "style=" border:0px;vertical-align:middle; "/>Then execute the reboot.After the machine has been successfully restarted and the/DEV/MAPPER/DATA3 is automatically mounted.650) this.width=650; "Src=" http://img.blog.csdn.net/20170907172310133?watermark/2/text/ ahr0cdovl2jsb2cuy3nkbi5uzxqvd3d3x3h1zv94aq==/font/5a6l5l2t/fontsize/400/fill/i0jbqkfcma==/dissolve/70/gravity/ Center "width=" "style=" border:0px;vertical-align:middle; "/>This article is from the "Breeze ai ai" bl

execution RCE, and is only small-scale spread.Restore attack processFind a Redis service without authentication:Vulnerable environments are user-built Linux hosts that run Redis services and open 6379 of Redis ports on the public web. Now cloud service provider Qingyun has provided the appropriate solution:Start Redis with non-root privilegesIncreased Redis password verificationProhibit public networks from opening Redis ports, for example, 6379 Redis ports can be disabled on a Qingyun firewall

After server restarts for the Linux operating system. System boot error, the system can not be used properly.1, error message 1.1, error screen information1.2, error message extraction key information(1)/dev/sda3:file ... (Inode #139928. MoD time Thu May 28 03:28:11 2015)Has 1135 multiply-claimed block (s), Sharedwith 1 file (s):(2)/dev/sda3:unexpected inconsistency. RUN fsck manually.(I.e.,without–a or–p options)[FAILED](3) * * * An error occurred during the file system check.dropping to a shel

The following conditions the Java object enters the persistence state: The Session.save () method transforms a temporary object into a persisted object. The objects obtained by the Session.load () and Session.get () methods are always in a persisted state. The Session.update (), Saveorupdate (), and Lock () methods transform the free object into a persistent state. The list () method returned by the query interface stores all persisted objects in the list collection. A persiste

Plugins provided by others, bake meshstatic void WriteString (BinaryWriter bw, string str, int cap){var ba = new Byte[cap];var bs = System.Text.Encoding.ASCII.GetBytes (str);Array.copy (BS, BA, BS. Length);Bw. Write (BA);}The direct result is that when the string is too long, the loss of the content read and subsequent chaining leads to serialization errors.Solution:1. Temporarily, expand the length of the cap.2. Dynamically use a variable-length string length instead of a write-dead cap.Recomme

Problem descriptionA jar package was added at development time, and when the delta package is deployed to the test server, the following error message appears when launching the app:Java.lang.LinkageError:loader constraint Violation:loader (instance of weblogic/utils/classloaders/ Changeawareclassloader) previously initiated loading for a different type with name "Org/w3c/dom/typeinfo"Note: Development uses Tomcat and the test server uses WebLogic.Cause of errorThe WebLogic comes with a jar pack

Note: Reference blog: https://www.cnblogs.com/dolphin0520/p/3933551.html1. Abnormal recurrence in single-thread environment public static void Main (string[] args) { arraylistWhen the while (Iterator.hasnext ()) loop is traversed, only the last element of the ArrayList internal elementdata[] is allowed to be deleted, but not removed from the middle.In the source code of Iterator.next (), the method is executed first: Checkforcomodification (); This method:final void Checkforcomodifica

When using Nginx, when uploading images asynchronously to the server, found to throw "error" errors, carefully found that the throw error content is: 413-request Entity Too Large, see the Tomcat run log when the background did not receive a file upload request, Finally found that Nginx limited the size of the file upload, directly intercepted the request. This error is due to nginx default upload file size configuration client_max_body_size only 2MB.Workaround:1, spring MVC upload files when the

The Delphi thread can run synchronously in the main thread by calling Athread.synchronize (Aproc), where Athread will hang until the main thread finishes executing aproc.If there is Bthread, Bthread.synchronize (Bproc) is called, and Athread is released in Bprocprocedure Tbthread.bproc begin athread.terminate; athread.waitfor; Athread.free; End;At this point our program will be stuck, the following code can avoid deadlocks, is a generic thread waiting for the end code. athread.terminate;

Error message:Org.hibernate.InvalidMappingException:Could not parse mapping document from resource/***/****.hbm.xmlThe project does not start properly, confirming that the hibernate mapping file exists.Problem solving:When the hibernate map file is generated backwards, the DTD file referenced by the header is "HTTP://WWW.HIBERNATE.ORG/DTD/HIBERNATE-MAPPING-3.0.DTD" and the original DTD file is "HTTP// Hibernate.sourceforge.net/hibernate-mapping-3.0.dtd ", manually modified to run normally.Cause

Environment: CentOS6.9 + nginx + php-fpm + mysql,web environment software is installed using Yum.使用yum安装nginx，启动nginx进程时默认是使用的系统用户是nginx， 编辑/etc/ nginx.conf文件可看到user nginx；使用yum安装php-fpm， 默认用户有可能为apache，查看/etc/php-fpm.conf或/etc/php -fpm.d/www.conf下找到user改为nginx即可解决问题。nginx处理php流程：如果是js、css、html等静态文件，nginx会直接返回给 客户端。如果遇到php等文件会，nginx会将php文件交给php进程处理， 处理完毕再返回给nginx进程，由nginx返回给客户端。此时如果php的运 行用户不是nginx就有可能导致php进程没有权限操作网站文件，比如生 成缓存等写入操作会被禁止。查看PHP进程用户： ps -ef | grep phpLNMP Environment permiss