How to write scheduled tasks in Oracle database

Oracle database's scheduled tasks, called job schedulers, can create and manage tasks that run commands or scripts regularly. The steps to create a task include: 1. Use CREATE JOB syntax to create a job; 2. Use the ALTER JOB statement to set the schedule, such as DAILY AT; 3. Use ALTER JOB ENABLE to enable the job. For example, to create a task "daily_report" that runs every morning at 8:00 am and export the data in the employees table to a CSV file, use the following steps: 1. Create the job; 2. Set the schedule to DAILY

Creation of Oracle database scheduled tasks

1. Introduction
Oracle database provides a task called "job Scheduler" function for creating and managing scheduled tasks. These tasks can run specific commands or scripts regularly to implement various automated tasks.

2. Steps to create a scheduled task

1. Create a job
Use the following syntax to create a job:

CREATE JOB <作业名称> AS <命令或脚本>

For example:

CREATE JOB my_job AS SELECT * FROM employees;

2. Set schedule
Specify the running schedule of the task:

ALTER JOB <作业名称> ENABLE SCHEDULE = <时间表>

The schedule can be specified using the following format:

• DAILY AT (for example:02:00)
• WEEKLY ON AT < Time>(For example:SUNDAY AT 09:00)
• MONTHLY ON DAY AT (For example:DAY 15 AT 18:00)

3. Enable job
By default, the job is disabled after creation. To enable a job, use:

ALTER JOB <作业名称> ENABLE

4. Disable a job
To disable a job, use:

ALTER JOB <作业名称> DISABLE

3. Example

Suppose we want to create a task named "daily_report" that runs every morning at 8:00 am, which exports data from the employees table to a CSV file.

-- 创建作业 CREATE JOB daily_report AS SPOOL /u01/export/employees.csv SELECT * FROM employees; SPOOL OFF -- 设置时间表 ALTER JOB daily_report ENABLE SCHEDULE = DAILY AT '08:00' -- 启用作业 ALTER JOB daily_report ENABLE

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