multicast troubleshooting

Chapter 7 JVM performance monitoring and troubleshooting tools (1), jvm troubleshooting 1. Locate System Problems Basis GC log Heapdump/hprof File) Thread snapshot (threaddump/javacore file) Running log Exception Stack Tools used for analysis Jps: displays all JVM processes in a specified system. Jstat: Collects JVM running data. Jinfo: displays JVM configuration informat

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 c

Record the troubleshooting and resolution of a deadlock, and record the troubleshootingThis is a sad reminder. I remember last week's busy schedule. The goal is to modify some bugs in the code left by another team. This project is used for OLAP analysis, the Logic Server is mainly responsible for metadata operations, such as information displayed on the page, and the Analysis Server is responsible for executing query statements, because they used mond

One troubleshooting-when the disk clearly has space, but it cannot be written in, the disk will be troubleshooting One week at work today, I finally started to operate and maintain the platform and encountered the first practical error. Today, I encountered an alarm saying that the disk cannot be written and I checked the disk space. When df-h is used to find that the disk is not fully written, there is

Oracle lock table troubleshooting example: Oracle lock table troubleshooting One time a developer directly runs the delete table operating system on the database server during peak hours, resulting in no response for a long period of execution. Then, the SQLPLUS client is closed and the delete statement is run again, this causes the database to run slowly.The query operation knows that it is caused by the l

The local computer fails to start Apache troubleshooting, Apache fault handling Recently, due to work needs, to learn the basic programming of PHP, so learning to set up PHP working environment. However, as described in the textbook, after the installation of WMAP, has been unable to run successfully. It was found that Apache was not running. Go to the Apache option in WMAP to select Start but not start. After the expert guidance, summed up the follo

GBK Chinese, but still in the compilation process is used garbled build② picture chromatic aberration (Srgb/argb/cmyk) and so on will cause compile error③ very grateful to the Teaching assistant's patient guidance, not only learned the knowledge also learned the open-source cooperative attitude, all day down the teaching assistants are all the way together to discuss, solve problems, not too many students annoying small problems, ta's enthusiasm and patience let me very touched. It's lucky to m

Hardware troubleshooting 1. Check your power cord again is not plugged well is very necessary, host, monitor! And make sure your power is unblocked. 2. Disassemble the host to see if your memory stick is plugged in, or unplug the memory strips, and try 3. The discharge of your computer, (unplug the power cord, press the power-on key) 4. Discharge Your Bois! 5. Make sure your computer is equipped with an operating system! Add: Software

Troubleshooting of common mysql errors and troubleshooting of mysql errors 1. mysql service cannot be started and error 1067 is reported Solution:1). decompress the mysql Server Directory and add a new my. ini file. The content is as follows: [Mysqld] # set basedir to installation path, e.g ., c:/mysql # set it to the installation directory basedir = c:/tool/mysql5617win32 # set datadir to location of data

Linux troubleshooting case (1): linux troubleshooting Running Environment: CentOS6.7 Fault Cause: Yesterday, the command yum-y update was executed online. The command was forcibly interrupted and the poweroff command was run to shut down. If a fault occurs during reboot: According to the prompt information analysis, the system kernel information may be disordered due to the incomplete execution of the

Online troubleshooting commands-Shell, online troubleshooting-shell Creation: Liu Xinyu, latest modification: about 4 hours ago Go to metadata start 1. Track online logs and regularly refresh the latest content tail-fn 200 $log 2. Search for a specified string # Show only matching rowsgrep$String $file# Match up or down n rows of the row where the string is locatedgrep-C n $String $

BTrace: Java online troubleshooting tool, btrace troubleshooting What is BTrace? BTrace is a killer for checking and solving online problems. BTrace can obtain all information during program execution by writing scripts. Note that you do not need to restart the service. Yes, you do not need to restart the service. Write the script and run it directly without the code of the original program. Principle In ge

The local computer cannot start Apache troubleshooting and apache troubleshooting Recently, due to work needs, I have to learn the basic programming of PHP, so I learned how to set up the working environment of PHP. However, as described in the textbook, after WMAP is installed, it cannot run successfully. Then we found that Apache has never been running. Go to the Apache option in WMAP to select start but

Jvm memory growth troubleshooting examples and jvm troubleshooting examplesTroubleshoot jvm memory Growth Troubleshoot the problem that the jvm memory usage continues to increase. record it and take it as a warning. The O M team found that the jvm memory usage of the application fell back after the release and continued to increase. After dumping, it analyzed: Public The bean Generation Code must be mult

Although the Linux system is very powerful, stable, but we use the process, if the human operation is not appropriate, will still affect the system, and may even make the system does not boot, unable to run services and other problems. Then this blog post summarizes some common troubleshooting methods, but it is impossible to cover all, can only continue to supplement, update.first, the administrator forgot the password(1), restart the computer, enter

first use the debug ip rip event command on router R1 to check the RIP Update Status, as shown in Figure 14.11, indicating that router R1 has not received any route updates from router R2, if the physical link is normal and the RIP configuration is normal, the hidden Deny statement of the ACL rejects the RIP update multicast address whose target address is 224.0.0.9, this will cause the RIP route update to fail. The solution is to add a

host and the network protocol provider, such as the auto-negotiation on line 8th here. If you find that the duplex of 15 rows is set to half, you can manually change it to full-duplex network:1 # ethtool-s eth0 Autoneg off Duplex full2. The NIC is enabled properlyThe general network physical connection failure situation is not uncommon, when troubleshooting physical connection problems, you need to further check the network card working status.Exampl

: 0 packets RxPause: 0 packets Output: Unicast: 1430 packets, Multicast: 803 packets Broadcast: 4 packets, JumboOctets: 0 packets Lost: 0 packets, Overflow: 0 packets, Underrun: 0 packets TxPause: 0 packets finds the cause of the problem by displaying the information. The IP address is not configured for the GE1/0/0 interface of route1. IP protocol troubleshooting: Procedure 1. Execute the sys

continuous development and improvement, another version emerged:RIP2. AndRIP1The biggest difference is thatRIP2A classless routing protocol that carries a subnet mask in the update message. It supportsVLSM,CIDR, Authentication and multicast. These two versions are currently widely used, and the difference between the two causes problems inRIPPay special attention to troubleshooting. We will also pay atten

The basic troubleshooting methods for linux network problems may often encounter download or upload failures when running linux network applications. How can we find the problem points when we encounter such problems? The following are some troubleshooting methods summarized during the learning process. The basic troubleshooting methods for the linux network prob