wow latency

25-NOV-2011 14:48:26Copyright (c) 1991, 2010, Oracle. All rights reserved.Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=node1.srtcloud.com)(PORT=1521))) --也会一个长时间的等待--问题原因:就是因为解析域名的时候，先去访问dns服务器，因为该ip非dns服务器ip，所以会一直等待该ip超时， --然后访问hosts文件获取ip地址（这个就是为什么我们登录或者查看监听状态的时候，会出现如此长的时间的等待） In fact, because of the phenomenon of DNS latency There are many kinds of, I just give a simple, more common example, in the processing due to DNS res

Tags: style blog http io color ar os sp forFrom Imysql Chinese network http://imysql.com/2014/08/30/mysql-faq-howto-monitor-slave-lag.shtmlIn a MySQL replication environment, we usually only judge the latency of the slave based on the value of the Seconds_behind_master. This is acceptable in most cases, but is not accurate enough and should be considered for more factors. First, let's look at the state of slave:[Email protected] [(None)]>Show Slave

When your users complain that the changed information does not change, the deleted data is still displayed, you pinch the count, it is estimated that the database master never synchronized.As with other databases that provide data synchronization, MongoDB also encounters synchronization latency issues in MongoDB's replicaOr provideserythromycin stearate 500mglike though. Hairhttp://blog.kaluinteriors.com/iqi/thyroxine-to-buy-without-perscription.htmlp

The method for measuring RTT is simple:Host A sends A message to host B, which includes the local time when host A sends the message.Host B immediately returns the message to hostAfter receiving the message, host A obtains the RTT by subtracting the current time from the time in the message.The NTP protocol works similarly. However, apart from measuring the RTT, NTP also needs to know the time difference (clock offset) between the two machines to calibrate the time. The above is the NTP protoco

Try another low-latency kernel-general Linux technology-Linux programming and kernel information. For more information, see the following. After Livid was updated to Ubuntu Studio, it was found that the kernel changed to 2.6.20-15-lowlatency, an optimized low-latency SMP kernel. Generally, we use the SMP kernel 2.6.20-15-generic in Feisty. I didn't pay attention to lowlatency kernel, so apt-get got it, we f

Example of file_get_contents high-latency usage in PHP, filegetcontents This article describes the advanced usage of file_get_contents in PHP. The specific analysis is as follows: First, solve the problem of file_get_contents timeout. After a timeout error is returned, an attempt is made like settimeout in js. After the error is returned three or five times, the attempt is confirmed to be unable to connect to the server and the attempt is completely a

The replication latency caused by the mutual blocking of MySQL 5.7 concurrent replication and mysqldump. The MySQL BINLOG and show processlist commands were originally two transactions that could not be reached by the client. However, in the recent troubleshooting, it was found that there was a serious replication delay between the master database and slave database, however, the slave_behind_master value is 0 in the database, and the replication SQL

With the development of China's exchange industry, we have also promoted updates and upgrades of various exchange technologies. Here we mainly analyze the 24-port full Gigabit Switch error frame Filtering test QoS testing. Familiar with the following 24-port full-Gigabit Switch knowledge, such as broadcast forwarding and latency testing. You can easily select your preferred method to implement 24 full gigabit switches. Many methods will make you sudde

A case for troubleshooting slave database latency in MySQL: mysql troubleshooting When a customer is inspected today, a core of the cpu of mysqld occupies 100% in the case of no business in the slave database. There is no SQL statement for querying the slow query of the master database.It can be said that the typical single-process replication causes a cpu to be fully occupied. If you know the reason, you can analyze it.Analyze what is written in the

This article mainly introduces how JavaScript achieves the sliding menu effect with the latency function. it involves the page style delay conversion function based on mouse events and time functions. it has some reference value, for more information about how JS achieves the sliding menu with the latency function, see the examples in this article. Share it with you for your reference. The details are as fo

Before thinking about how to reduce the latency of the API, there are several time-consuming operations in these APIs and serial execution, which can theoretically reduce the elapsed time by executing asynchronously, as shown in the following:The specific implementation is simple, such as this: Public classParallelretrievalexample {FinalCacheretriever Cacheretriever;FinalDbretriever Dbretriever;Parallelretrievalexample(Cacheretriever cacheretriever, D

Source: China dos Alliance For latency extension of environment variables, use set /? You can see some of the instructions, but considering its poor translation level, it is recommended that you switch chcp 437 to English to view the original English instructions before viewing. Given that this article has been very detailed, and there are several Code Examples are not difficult to understand. Only a few supplements are provided here. In many of

Web games, especially the instant combat webgame with multiple online users at the same time, performance optimization is an inevitable problem in the development process and in the later stages of development. After the hardships, we have summarized a Best Practice: latency strategy. To put it bluntly, just one sentence: Do not do too many things in one frame. Then, let's make a summary.Understanding asynchronous single thread of Flash Player First,

11.3.1.2 Haskell's latency calculation policy, 11.3.1.2haskell 11.3.1.2 Haskell latency calculation Policy In lazy evaluation strategy, the parameter value of the function is not calculated during function calling until it is used later. Let's go back to the previous example: TestAndCalculate (Calculate (10 )); Haskell jumps directly to the subject of the TestAndCalculate function. Haskell remembe

Codeforces Round #312 (Div. 2) E. A Simple Task line segment tree latency tag, E. A Simple TaskTime limit per test5 secondsMemory limit per test512 megabytesInputstandard inputOutputstandard outputThis task is very simple. given a string S of length n and q queries each query is on the format I j k which means sort the substring consisting of the characters from I to j in non-decreasing order if k limit = Limit 1 or in non-increasing order if k Limit

Js enables delayed loading of webpage images to increase webpage opening speed and js latency There are many ways to increase the speed of webpage loading, using jquery. lazyload. js achieves asynchronous and delayed loading of images. For websites with a large number of images on the page, it is a good way to increase the speed of webpage opening. On the left side of the bar page of the Code official website, you can see an article thumbnail display

Problem description: ProgramAfter the master database is updated, the data queried from the slave database does not change. It is suspected that the synchronization delay of the Master/Slave database is caused. Check the master-slave synchronization status from the database and find that seconds_behind_master takes more than one thousand seconds. Under normal circumstances, the latency of the Master/Slave database can be tolerated for more than 10 s

Latency SetTimeout (Code, millisec): Used to call the function after the specified number of milliseconds [set latency] VaR timeoutid = setTimeout (function () {alert ('pop up after five seconds ');}, 5000 ); ClearTimeout (timeoutid): Used to cancel the delay set by the setTimeout Function Periodic call (timer) SetInterval (Code, millisec): Used to call a function at a specified period (in milliseconds )

implemented.Gettimeofday system calls are in the same variable.Do_gettimeofday's prototype:#include void Do_gettimeofday (struct timeval *tv);The current time can also be obtained by xtime variables (type struct timespec), but with less precision.The kernel provides an auxiliary function Current_kernel_time:#include struct Timespec current_kernel_time (void);Current_kernel_time is expressed in nanosecond precision, but only the resolution of clock ticks;Do_gettimeofday continues to report back

In the MySQL world, Haproxy is often used as a software load balancer. Peter Boros explains how to use the Percona xtradb cluster (PXC) to set it up in a previous message. So it only sends the query to the applicable node. The same method can be used for general master-slave settings to read the load and spread across multiple nodes. However, with MySQL replication, another factor starts to work: replication latency. In this case, the mentioned Percon