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In some projects, ha-related issues are encountered, and keepalive is a widely used functional module, and as OpenStack is common in cloud computing, more and more projects migrate into the KVM environment created by OpenStack. Disclaimer: This

Doing projects sometimes run into some states that need to be maintained on a daily basis, and my plan is to write SQL statements or stored procedures, and then configure the MySQL scheduler to let the database execute every day. Don't say much

MySQL Event learningIn System management or database management, it is often imperative to execute a command or SQL statement periodically. Anyone familiar with the Linux system knows the Cron scheduling task of Linux, and it is easy to implement

Today I mainly learned the basic knowledge of MySQL.First, the introduction of the database　1. Classification of databases　　　To learn the database we first need to understand what is a database, the database is similar to a warehouse, can store a

First, the basic conceptThe mysql5.1 version begins with the introduction of the event concept. Event is not only a "time trigger", unlike the events triggered by the triggers, the event is similar to a Linux crontab scheduled task for time

First, prefaceSince MySQL5.1.6, a feature has been added – Event Scheduler (Scheduler), which can be used to perform certain tasks on a timed basis (for example, deleting records, summarizing data, and so on) to replace work that was previously only

Because the project needs to create a timer (EVEVT), so Baidu a bit, found that the basic is from a template, some functions are not complete, now summarize their own. Note: The MySQL version is supported for event starting from 5.1. If your version

First, the foreword since MySQL5.1.0, has added a very characteristic function – Event Scheduler (Scheduler), can be used to perform certain tasks on a timed basis (for example: Deleting records, summarizing data, etc.) to replace the work that was

/* User and Rights Management */-----------User Information table: MySQL. User --Refresh PermissionsFLUSH Privileges --Increase user CREATE user username identified by [PASSWORD] Password (string)-You must have the global Create user permission

1. Check if your MySQL has this functionSHOW VARIABLES like ' Event_scheduler ';I executed the discovery record as empty description my MySQL didn't open. OK solution2. Open your MySQL's Scheduled tasks featureBefore using this feature, you must

Original: http://www.cnblogs.com/c840136/articles/2388512.html Memo; A new feature is introduced in the mysql5.1.x release, which, as the name implies, is an event, timed task mechanism that performs a specific task within a specified time unit, so

1: Delete ColumnsALTER table "table name" DROP "column name"2: Add columnsALTER table "table name" ADD "column name" INT not NULL COMMENT ' comment description '3: Modify the column type informationALTER table "table name" Change "column Name" "New

First, preface since MySQL5.1.6, has added a very distinctive feature – event scheduler, which can be used to perform certain tasks on a timed basis (for example: Deleting records, summarizing data, etc.). To replace work that was previously only

MySQL supports timed tasks above 5.1.SHOW VARIABLES like ' Event_scheduler '; Check if the feature is turned onTo open the Scheduled Tasks feature:SET GLOBAL event_scheduler = 1;or set GLOBAL Event_scheduler = on;OrMy.ini or MY.CNF in the[Mysqld]Add

Original link: http://www.cnblogs.com/c840136/articles/2388512.html　　A new feature is introduced in the mysql5.1.x release, which, as the name implies, is an event, timed task mechanism that performs a specific task within a specified time unit, so

I. Basic ConceptsThe event concept was introduced in MySQL. The event is a time trigger, which is different from triggers event triggering. The event is similar to a linux crontab scheduled task for time triggering. It can be used independently or

Usage of event in mysql I. Basic conceptsThe event concept was introduced in MySQL. The event is a time trigger, which is different from triggers event triggering. The event is similar to a linux crontab scheduled task for time triggering. It can be

OrderIn the previous article, how to insert, modify, and delete word annotations in C # describes some ways to manipulate word annotations, and in this article you will continue to explain how to manipulate word annotations. The following three

Because the YII test framework is built on PHPUnit, it is recommended that you read through the PHPUnit document before you understand how to write a unit test. Let's briefly summarize the basic principles of writing a unit test in Yii: A unit

On-Demand Routing principle (ODR-On Demand Routing)ODR uses Cisco's Discovery Protocol CDP to transmit network information between the branch router and the central router. It is only applicable to the central-branch topology environment. The vrolan