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In multithreading, to maintain data consistency, you must lock the data or function that accesses the data. This is common in the database, but most of the programs are single-threaded, therefore, there is no need for locking, but in multithreading, to maintain data synchronization, We must lock it. Fortunately, the Framework already provides us with three locking mechanisms, they are the Monitor class, Lock keyword, and Mutex class.The usage of the L
Nagios is a popular computer system and network monitoring program that detects hosts and services and alerts users when an exception occurs and is released. It is open source software developed based on GPLV2 and is available for free and use.How Nagios WorksNagios's function is to monitor services and hosts, but it does not include these features, and all monitoring and detection functions are done through a variety of plugins. After you start Nagio
Multi-threaded execution methods cannot call the secondary method when the method is not finished executing.It takes a minute to execute a method in a loop, and no member can call the method again within a minute.classMonitorsample {Private intn =1;//data that producers and consumers work together Private intMax =10000; Private ObjectMonitor =New Object(); Public voidProduce () {Lock(monitor) { for(; n ) {Console.WriteLine ("Mom: No."+ n.tostr
Monitoring You can monitor the health of the cloud server ECS instances from multiple dimensions to ensure that the instance is running smoothly. You can monitor the operation of an ECS instance from the following two portals: Instance Details Cloud Monitoring Instance Details Log on to the Cloud Server Management Console. Click an instance in the left-hand navigation bar. Then select the region at
One, the monitor black screen Black screen is our computer startup frequently encountered problems, black screen is usually caused by the following reasons: 1, look at the monitor power is not turned on, if turned on please check the power cord connection of the monitor is intact. Remember, if you don't turn on the monito
Why use the Wsexplorer and TCP/IP Monitor tool 1, in order to better understand the process of WebService request 2. In order to get SOAP data sent and accepted formats 3, in order to monitor the interception of request headers and response to the specific data, using TCP/IP monitor what is soap. 1. The SOAP protocol is actually a text protocol based on XML codi
The reason for this mailbox is basically the data cable of the monitor is bad cause, when the data cable may be loose or open the machine there is a current through the oxidation of the cause of poor contact. It is recommended to reseat the video card first, preferably with a paper towel or eraser to wipe the golden finger of the card, to ensure that there is no oxide layer, and then is to plug the real monitor
-->orabbix Brief Description Orabbix is a Zabbix plug-in tool for monitoring Oracle database performance by installing the data on the client on the monitored server and passing it to the Zabbix server side, and then by calling the graphical display. Has the following features: (1), database version (2), archive documents (3), waiting for events (such as file I/O, single block read, multiple read, direct read, sqlnet message, control file I/O, log write, etc.) (4), Hitratio (
Replication is the most powerful and complex component in SQL Server, so it is unavoidable to replicate errors in specific applications. But, thankfully, SQL Server provides replication management tools-Replication Monitor to help DBAs find out why replication errors occur. With Replication Monitor you can: Browse all Publishers ' publications and subscriptions supported by the distributor; Browse the sta
Windows 8 Resource Monitor is a powerful tool for understanding how processes and services use system resources. In addition to monitoring resource usage in real time, Resource Monitor can help analyze unresponsive processes, determine which applications are using files, and control processes and services. 1, Settings-Control Panel-management tools-resource monitor
Windows 8 Resource Monitor is a powerful tool for understanding how processes and services use system resources. In addition to monitoring resource usage in real time, Resource Monitor can help analyze unresponsive processes, determine which applications are using files, and control processes and services. 1, Settings-Control Panel-management tools-resource monitor
When we use LR for performance testing, we often have a need to monitor the OS's resource usage. For Windows system, this work is very convenient, directly in the LR Resource Monitoring window to add the need to be monitored by the machine name or IP, but for the Linux/unix system, it is slightly more complicated, I am here to briefly describe how to monitor the LR in the linux/ Resource Usage for UNIX syst
After the monitor is turned on, the screen is shaken. This may be caused by the following reasons. 1. The power transformer produces a relatively large electromagnetic interference when working, resulting in screen jitter. The problem can be solved by placing the power transformers away from the chassis and the monitor. 2. Refresh frequency set improperly, adjust again, until the screen return to n
Why is the internet slow? MAC Activity Monitor helps you find out why . For MAC users There are a lot of network usage monitor, in order to improve the speed of the Internet, many users want to use this type of tool to see where the speed is used, or to limit the network of "big Net". But Mac's new users, do you know that the activity monitor in the system alrea
How to set up a notebook external flat panel monitor? The method steps for setting the details are as follows: The output frequency of the notebook does need to look at the performance of the video card of the notebook, but the more decision of this refresh frequency is the screen itself, the LCD is mainly divided into two kinds of standard 6 hertz, and the other is the Nvidia 3D display which is required by 120 Hertz screen Support, and need to supp
Raspberry Pi (Raspberry Pi Model B +) No monitor and wireless card get started GuideRecently bought a Raspberry Pi board (Raspberry Pi Model B +) used for learning, only bought a block of bare board no monitor and network card (now feel that there is absolutely no need to buy a monitor), in the setting up the environment encountered some problems, Now a summary o
Ignoring user Configuration file/root/.msmtprc:no such file ordirectory Falling back to default account Msmtp:account Default not found:no configuration file available So copy the/USR/LOCAL/ETC/MSMTPRC as/ROOT/.MSMTPRC Check the Mutt file installation directory Copy Code code as follows: RPM-QL Mutt So copy/etc/muttrc as/root/.muttrc to send mail. Second, monitor the server system load situation: 1, with th
fileRestart Zabbix-agent Service# Service Zabbix-agent RestartCreate a monitoring user for MySQLMysql> Grant Process,super,select on * * to [e-mail protected] ' localhost ' identified by ' monitor ';mysql> flush Privileges;To modify a user name and password in a script# vim/var/lib/zabbix/percona/scripts/ss_get_mysql_stats.php$mysql _user = ' monitor '; $mysql _pass = '
Tags: NEC sharp Highlight Port Database phase picture State developmentIn the high-concurrency Web site architecture, MySQL database master-slave synchronization is indispensable, but often occur due to network reasons or operation errors, MySQL master and slave often appear out of sync, then how to monitor MySQL master-slave synchronization, also become the site normal operation of the important link. MySQL synchronization function by 3 threads (mas
Label:Using shell scripts to monitor and manage Oracle databases will greatly simplify the workload of DBAs, such as common monitoring of instances, monitoring of monitors, monitoring of alarm logs, backup of databases, automatic mailing of AWR report, etc. This article gives an example of using shell scripts to monitor Oracle instances under Linux. Reference for Linux Shell:Linux/unix calling Sql,rman scri
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