causes of pvcs

Zend Optimizer not installed possible causes and solutionsOptimizer, Zendin the configuration of the PHP server, all things are installed, is to browse a request Zend program, always prompt "Zend Optimizer not Installed", uninstall reinstall also not, it is depressed. Online search, there are many of this problem, here are some of the extracts of the solution:1.Zend, and the installation is completed but found "Zend Optimizer not Installed", After som

Hong Kong server is favored by many webmasters, because of the stability of the server itself and the advantages of not record-keeping, coupled with the intensification of economic globalization, so that the foreign trade industry, the army continues to grow, which makes Hong Kong server leasing become a key business, then in the rental of Hong Kong server during the various problems will arise, We must find out the causes of these problems, so as to

Original: Dispatcher.begininvoke () Analysis of causes of UI interface deadlock caused by improper use of methodsSome time ago, a company colleague developed a gadget that, during the execution of the tool, theUI interface was stuck in a state of deadlock. by reading Code discovery, the main reason is that Improper use of the Dispatcher.begininvoke () method.This article uses a WPF simulation program to demonstrate the phenomenon of interface deadlock

Opcache causes php-fpm to crash. nginx returns 502 and php-fpmng.pdf. Opcache causes php-fpm to crash. nginx returns 502. php-fpmnginx my blog has added the opcache extension to vps to improve the running efficiency. it is found that a page returns 502 and other pages are normal. Opcache causes php-fpm to crash nginx returns 502, php-fpmng.pdf In order to impr

Problem logging-load Balancer equalizer configured for high availability causes problemsProblem Description:Using PHP to develop a awards program, to call the server interface to the person to send props, but this item must be strictly controlled only sent onceThat is, the request can only be sent once, but there will always be a chance to trigger a number of cases, analysis of the background web write logs, it is true that only the hairA request.Prob

Disk is fullThe most likely cause of the system not working correctly is that the disk is full. A good network administrator will pay close attention to the use of the disk, a certain amount of time, you need to dump some of the load on the disk to the backup storage media (such as tape). The log file will quickly run out of all disk space. The Web server's log files, sql*net log files, jdbc log files, and application server log files are all equally harmful to memory leaks. You can take steps t

PHP comes with a session hidden Danger (session file exclusive lock causes blocking) PHP Default Session processor is Session.save_handler = files (that is, file). If the same client concurrently sends multiple requests (such as Ajax sending multiple requests at the same time on the page), and the script executes longer, it can cause the session file to block and affect performance. Because PHP executes session_start () for each request, the

int main () { int i; int a[5]; for (i = 0; I A variable is passed in as a function parameter, but after the function call is finished , the value of the variable has changed, do not know why. It turns out that there is an address cross-border problem in the function, which causes the value of the variable to be changed, a bit incredible! For example, the following program, because the array subscript out of bounds

Runtime.getRuntime.exec () Execution of Linux scripts causes the program to dieProblem:In a Java program, executing a Linux script with Runtime.getruntime (). EXEC () causes the program to be suspended, and the script executes directly on the terminal without any problems.Reason:First look at the Java code:Public final static void Process1 (string[] cmdarray) {Process p = null;BufferedReader br = null;try {

A few days ago, a switch cascade using a Cisco 2950 switch and a 100MB port of Tp-link 24 ports. Causes the Cascade ports on the Cisco 2950 device to be in use one day later, the next morning when the port shows err-disabled. The network is not working. How to deal with?To view the interface status:GX-SW-2950-01#SH Interfaces F0/2FASTETHERNET0/2 is off, line protocol was down (err-disabled)Hardware is Fast Ethernet, address is 0011.bb48.d4c2 (BIA 0011

Today's computer is close to full popularity of the degree, it gives people in the work and learning to provide a great convenience, however, the computer's "panic" for ordinary computer users, but become a solution is not open, earn not off the trouble. When the computer is turned on, or when the operating system is started, or when some applications are being used, or when you are about to exit the operating system, the "Crash" of the "beast" is likely to come head-on at any moment. So, how to

Information duplication, information overload, information forcing, personalized customization, search engine dependence, these five are closely related. In the information-expanding Internet, especially in the Web2.0 era where many people contribute, information duplication and information overload are particularly obvious. There are many reasons for information overload, one reason is information duplication, information overload can lead to anxiety, irritability and so on. This paper attempts

Computer network failure is unavoidable. Network fault diagnosis is an important work of network management. Generally when the network occurs information is not available, can not browse the Web, and other connectivity failures, the phenomenon is relatively clear, easy to observe and locate the fault point, such a fault is not difficult to solve. But the most troubling thing is that the internet is a pass, but the network speed slows down. When confronted with such "soft faults" for the first

Most people may have experienced the system blue screen problem, but most people do not know how to deal with the blue screen problem, here mainly to do some explanation of the system blue screen, and introduce the blue screen problem analysis tool WinDbg analysis blue screen problem general steps.Microsoft's official definition of the blue screen is that when the system encounters something that could threaten the security of the system, the system stops working, and the State (that is, the blu

are set to seconds by default to 60 secondsUsually configuring the above 2 parameters can reduce the master-slave data synchronization delay caused by network problemsRelated optimizations: mysql> create DATABASE Fafa; Query OK, 1 row affected (0.01 sec) mysql> use Fafa Database changed mysql> CREATE TABLE test (JJ Int,kk varchar ( 10)); Query OK, 0 rows affected (0.02 sec) Next we loop through the data experiment in the main library, and then look at the process state, and the synchronization

Label:Crfclust.bdb occupies huge space and causes the disk to be fullProblem Analysis:When you get to work, you have a phone call saying a set of RAC database can not access, then landed on the first view of the disk space, found two nodes/dbsoft directory is full, the first suspect is the alarm log files and $oracle_home/dbs generated by the archive log file is not deleted, After the examination the facts denied my judgment.It was immediately thought

There is a problem that the NULL value in the table causes the notin subquery to become invalid-this is the first SQL statement I wrote to the business. The data in the query was 0, and it was sent out without too much consideration. After the business showed me several pieces of test data, I found that the query results were incorrect. Br -- check whether the statement logic is correct. After troubleshooting, several rows of cust_id in BB are NULL, r

Wed Aug 20 17:16:37 2008ORA-1652: unable to extend temp segment by 128 in tablespace DBA_TEMP To solve this problem, we need to first cause the problem of SQL, there are several possible methods: 1. Set events Alter system set events '1652 trace name errorstack level 1 '; This method has some limitations: 1) it cannot obtain the error message of 1652 that has occurred. It can only generate a trace file when a 1652 error occurs in the future; 2) with events, it is unclear what will affect the dat

// Ptr- gt; d_off indicates the int type. // The compiling and execution environment is the LinuxUbuntuPC host. // Print the output code below. Accidentally writing % d into % s causes Segmentationfaultprintf ("ptr- gt; d_off = % s; \ n", ptr- gt; d_off); // After compilation, the following message is always prompted during execution: Segmentationfault // It took me several hours to find // Ptr-> d_off indicates int type. // The compiling and execut

It is easy to upgrade a vro. Find the required version and complete the upgrade step by step. However, some network administrators indicate that the Internet cafe's soft route upgrade failed. The vro is successfully installed. After the configuration is complete, the firmware version of The vro is upgraded, but the upgrade fails. The possible causes for the upgrade of the soft route for Internet cafes are as follows: 1. The Internet cafe's sof