redelivery scheduled

1. View the self-launch listchkconfig --list（centos6）systemctl is-enabled crond.service （centos7）2. See if it is currently startedps aux | grep crond3, start and set to self-start (crontab generally for the system self-boot, do not need to set up the following)启动：service crond restart（centos6），systemctl start crond.service（centos7）设置为自启动：chkconfig crond on （centos6），systemctl enable crond.service（centos7）4. Using crontabcrontab [Options]Options:-E: Editing crontab timed tasks-L: Query crontab ta

PHP scheduled execution in three ways1. windows scheduled tasks2. linux script program3. Regularly refresh web browsersImplementationWindows scheduled taskPHP rarely run on the Windows server, the specific implementation is not further study, see the principle of online implementation is probably write bat script, and then let the window task to add the execution

Once the framework uses the Quartz framework to run timing scheduling problems,The boss said that the configuration is too cumbersome, each scheduling needs to be more in the spring configuration,Can reduce the amount of configuration to improve development efficiency,Recently, we have looked at spring's scheduled using annotations to dispatch,Feel very convenient, at least the configuration of things less very much,So stay for forgetting,First, we ne

code example:1 ' 2012-07-18 00:00:00 ' On completion preserveenabledoupdate ' om_courselist ' SET ' status '=6 WHERE ' status ' =5 and ' Closetime ' current_timestamp ();You can create events with Navicat, and more quickly:Navicat creating and designing MySQL Events1. Turn on the timer 0:off 1:onSET GLOBAL event_scheduler = 1;2. Select a database on the left side of Navicat, and click "Time"-"create event" to bring up a window.In the Define option, enter the SQL statement, beginning with begin,

Implementation of PHP Scheduled tasks and Scheduled tasks function Ignore_user_abort (), Set_time_limit (0), Sleep ($interval)This code can only be run once and then close the browser.Do not know the performance of the program will not affect very much! Ignore_user_abort ();//switch off the browser, PHP script can continue to execute.Set_time_limit (0);//Set_time_limit (0) allows the program to execute i

Crontab: scheduled task execution. Crontab: scheduled task execution. I recently came into contact with the needs of scheduled execution programs, so I learned about crontab. This article first introduces the syntax knowledge of crontab, and then makes a demo. I. crontab syntax 1. Basic crontab format {Minute} {hour} {day-of-month} {day-of-week} {full-path-to-she

restore data. The principle is to import the previously backed up DMP database file to the database. The content of imp. bat is as follows: Sqlplus xuwei/xuwei @ orcl @ F: \ mydata_mytest \ droptables. SQLIMP xuwei/xuwei @ orcl file = F: \ mydata_mytest \ oradata. dmp full = y ignore = y 2.4. Notes on BAT file naming The two batch files are named database_imp.bat and database_exp.bat respectively. BAT and Exp. bat, double-clicking these two files will cause errors, and dragging them to th

Php scheduled task implementation principle, php scheduled task Principle AccordingPhpThe manual briefly introduces some related knowledge: 1. Connection processing: InPHPInternal, the system maintains the connection status. There are three possible states: 0-NORMAL (NORMAL)1-ABORTED (exit unexpectedly)2-TIMEOUT (TIMEOUT) WhenPHPThe connection is valid when the script runs normally. When the remote client i

Author: Zhu Maohai/Category: Faq/tag:crontabEach operating system has its automatic Timer launcher function, Windows has its Task Scheduler, and Linux corresponds to the function of crontab.Crontab IntroductionThe crontab command is commonly used in Unix-and Unix-like operating systems to set instructions that are executed periodically. The command reads the instruction from the standard input device and stores it in a "crontab" file for later reading and execution.　　The word derives from the Gr

Sometimes scheduled tasks are required to monitor a program. The program must run automatically. 1. the ignore_user_abort () function can be used with set_time_limit (0) and sleep ($ interval) to automatically update programs. Example: 1234567891011121314151617 even if Cl... sometimes requires scheduled tasks to monitor a program. The program must run automatically. 1. ignore_user_abort () The ignore_user_a

Once the framework uses the Quartz framework to run timing scheduling problems,The boss said that the configuration is too cumbersome, each scheduling needs to be more in the spring configuration,Can reduce the amount of configuration to improve development efficiency,Recently, we have looked at spring's scheduled using annotations to dispatch,Feel very convenient, at least the configuration of things less very much,So stay for forgetting,First, we ne

Many people use crontab to implement PHP to perform timed tasks under Linux and fail to generate the cache. This paper analyzes the reasons of using crontab to realize scheduled PHP task failure in Linux. Generally we Linux regularly execute PHP code such as: */5 * * * */usr/local/php/bin/php/home/wwwroot/1.php In fact, this is possible to execute PHP code. But why do many friends write in 1.php to generate a cache file that is not generated? This in

Remember this function: Function Name: Ignore_user_abort Whether the PHP program continues to execute after this function has been configured or if the use End connection is interrupted. The default value stops when the connection is interrupted. The Ignore_user_abort option in the PHP configuration file (Php3.ini/php.ini) is the configuration section. This feature is only available after PHP version 3.0.7. Official Note: http://cn2.php.net/manual/en/function.ignore-user-abort.php How to use: C

Check whether event is enabled The Code is as follows: Show variables like '% sche % '; Enable the event plan The Code is as follows: Set global event_scheduler = 1; Create a stored procedure test The Code is as follows: Create procedure test () BEGIN Update examinfo SET endtime = now () WHERE id = 14; END; Create event e_test The Code is as follows: Create event if not exists e_test On schedule every 30 second On completion preserve Do call test (); The stored procedure test i

Record id = 14 in examinfo. Close event task The Code is as follows: Alter event e_test ON Completion preserve disable; Account Opening event task The Code is as follows: Alter event e_test ON Completion preserve enable; All tests are successful. The test environment is mysql 5.4.2-beta-community mysql community server (GPL) The above content is an introduction to the regular execution of MySQL. I hope you will have some gains. The scheduled mysql ta

The ignore_user_abort (), set_time_limit (0), and sleep ($ interval) functions used for PHP task scheduling and scheduled task execution can be used to close the browser once the code is run. I wonder if the performance of the program will be greatly affected! The code is as follows: Ignore_user_abort (); // close the browser and run the PHP script. Set_time_limit (0); // use set_time_limit (0) to allow unlimited execution of the program $ Inte

The ignore_user_abort (), set_time_limit (0), and sleep ($ interval) functions used for PHP task scheduling and scheduled task execution can be used to close the browser once the code is run. I wonder if the performance of the program will be greatly affected! The code is as follows: Ignore_user_abort (); // close the browser and run the PHP script.Set_time_limit (0); // use set_time_limit (0) to allow unlimited execution of the program$ Interva

Linux scheduled task supplement and Linux task supplement Scheduled task instances Example 1: print your name to the "/server/log/file named after your name" every minute. [Root @ chengliang log] # mkdir-p/server/log/[root @ chengliang log] # echo "chensiqi">/server/log/chengliang [root @ chengliang log] # crontab-l # time sync by zcl at least /5/8 */5 *****/usr/sbin/ntpdate time.nist.gov>/dev/null 2> 1 [r

Linux crond scheduled taskChapter 1 What is Crond? Crond is a service or software used in linux to regularly execute commands or specify program tasks. Generally, after the CentOS5/6linux operating system is installed, the Crond task scheduling service is started by default. The Crond service checks the system for tasks to be executed on a regular basis (which is checked every minute by default. If yes, the schedu