MySQL: How to create a SQL Job or Event Scheduler for scheduling the Database Task

Anvesh Patel — Thu, 17 Nov 2016 18:28:12 +0000

In this post, I am sharing one of important and basic article about, How to create a SQL Job or scheduler in the MySQL Database Server.

For scheduling the database tasks are very common exercise for all Database Developers and Database Administrators.

The SQL Agent is available in SQL Server and The PG Agent is available in PostgreSQL.

If you want to schedule your database task in MySQL, You should use default Event Scheduler of MySQL Database Server.

You can define event using CREATE EVENT statement and It requires the EVENT privilege for the schema in which the event is to be created.

It might also require the SUPER privilege.

You can access below full demonstration step by step.

Create a sample table:

CREATE TABLE tbl_Students 
(
	StudID INT 
    ,StudName VARCHAR(50)
);

Check the status of Event Variable:

SET GLOBAL event_scheduler = ON;

If it is not enabled, enable it:

SET GLOBAL event_scheduler = ON;

Check the running processes:

SHOW PROCESSLIST;
-- event_scheduler User is running under command "Daemon"

Create an event to insert in tbl_Students at every minute:

CREATE EVENT Eve_tbl_Students_Temp_Insert
ON SCHEDULE EVERY 1 MINUTE
DO
  INSERT INTO tbl_Students 
  VALUES (1,'Anvesh');

Create one more event to test the Delete operation:

CREATE EVENT Eve_tbl_Students_Temp_Delete
ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 MINUTE
DO
  DELETE FROM tbl_Students;

You can also alter the created events:

ALTER EVENT Eve_tbl_Students_Temp_Insert ON SCHEDULE EVERY 2 MINUTE;

You can also disable the events:

ALTER EVENT Eve_tbl_Students_Temp_Insert DISABLE; 
ALTER EVENT Eve_tbl_Students_Temp_Delete DISABLE;

You can also drop the events:

DROP EVENT Eve_tbl_Students_Temp_Insert;
DROP EVENT Eve_tbl_Students_Temp_Delete;

SQL Server: Important System Tables for Alerts, SQL Jobs, Operators

Anvesh Patel — Fri, 13 May 2016 20:14:37 +0000

In this post, I am sharing a list of important system tables to find information about the SQL Server Agent.

These system tables are very useful for a Database Administrator to find out different information about the SQL Job, Alerts and Operators.

The MSDB contains all SQL Server Agent information in the following tables.

Stores information about the alerts:

SELECT *FROM msdb.dbo.sysalerts

Stores information about current SQL Server Agent job activity and status:

SELECT *FROM msdb.dbo.sysjobactivity

Stores information about the execution of scheduled jobs by SQL Server Agent:

SELECT *FROM msdb.dbo.sysjobhistory

Stores information for each scheduled job to be executed by SQL Server Agent:

SELECT *FROM msdb.dbo.sysjobs

Stores schedule information for jobs to be executed by SQL Server Agent:

SELECT *FROM msdb.dbo.sysjobschedules

Stores information about each step of the jobs:

SELECT *FROM msdb.dbo.sysjobsteps

Stores information about job step logs:

SELECT *FROM msdb.dbo.sysjobstepslogs

Stores information about SQL Server Agent operator:

SELECT *FROM msdb.dbo.sysoperators

Stores information about SQL Server Agent job schedules:

SELECT *FROM msdb.dbo.sysschedules