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:

<code class="sql">CREATE JOB <作业名称>
AS
<命令或脚本></code>

For example:

<code class="sql">CREATE JOB my_job
AS
SELECT * FROM employees;</code>

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

<code class="sql">ALTER JOB <作业名称> ENABLE
SCHEDULE = <时间表></code>

The schedule can be specified using the following format:

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

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

<code class="sql">ALTER JOB <作业名称> ENABLE</code>

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

<code class="sql">ALTER JOB <作业名称> DISABLE</code>

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.

<code class="sql">-- 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</code>

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