How to configure scheduled data deletion in MySQL

2 years ago
Olivia Parker
2 minutes

To schedule data deletion in MySQL, you can use the event scheduler provided by MySQL. Here is an example of the steps involved:

  1. Make sure that your MySQL server has the event scheduler enabled. You can add or modify the following line in the [mysqld] section of the configuration file: event_scheduler=ON. Then restart the MySQL server.
  2. Create an event to delete data using the following syntax:
  3. Schedule an event with the name “event_name” to delete rows from the table “table_name” based on a certain condition.
  4. event_name: The name of the event can be customized.
  5. Event scheduling time: can be in one of the following formats:

    – AT timestamp: one-time event, will be executed at the specified time.
    – EVERY interval: recurring event, will be executed every certain interval.

  6. Name of the table: the table from which data needs to be deleted.
  7. condition: the criteria for deleting data, which can be customized based on your needs.
  8. For example, the following illustration sets up an event that deletes expired order data from the orders table every day at 1 a.m.
  9. Schedule an event named “delete_expired_orders” to run every day starting from 1st January 2022 at 1:00 AM, and delete orders with expiration dates before the current time.
  10. This event will be executed daily at 1 am to delete expired order data from the orders table.
  11. Use the following syntax to modify or delete events:
  12. Change event: Use the ALTER EVENT event_name statement to modify the scheduling time and execution statements of an event. For example, to change the scheduling time of the event above to execute every hour, you can use the following statement: ALTER EVENT delete_expired_orders ON SCHEDULE EVERY 1 HOUR;
  13. Delete event: To delete an event, use the statement DROP EVENT event_name. For example, to delete the event above, you can use the following statement: DROP EVENT delete_expired_orders.
  14. Use the following syntax to view created events:
  15. Display events.
  16. This will display detailed information about all defined events, including name, scheduled time, status, and more.

Please note that in order to create, modify, or delete events, you need to have the appropriate permissions (e.g. EVENT permission). If you do not have sufficient permissions, you may need to use a MySQL user with those permissions to carry out the above actions.

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