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why this mysql event can't get run?
(2 answers)
Closed 9 years ago.
I've created the following event, but for some reason it's not getting triggered:
CREATE EVENT Del_logs
ON SCHEDULE EVERY 1 HOUR
DO
TRUNCATE TABLE security.errors;
Is there any log I could check to see what went wrong?
It looks like the event scheduler is OFF.
use SHOW PROCESSLIST to check if the event scheduler is enabled. If it's ON you should see a process "Daemon" by user "event_scheduler".
use
SET GLOBAL event_scheduler = ON;
to enable the scheduler if it's currently not enabled.
More on configuring event scheduler read here
Related
How to check event scheduler status in MySQL database?
I want to know the running status of my event whether it is running or not?
how to check event scheduler status
It can be ON or OFF (TRUE/FALSE, 1/0) and can be viewed by
SELECT ##GLOBAL.event_scheduler;
-- or
SELECT ##event_scheduler;
for example.
i want to know the running status of my event whether it is running or not
This is absolutely another task. Event scheduler != Event.
Look at
SHOW PROCESSLIST;
for your event executing thread row is present or not.
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How can I undo a mysql statement that I just executed?
(6 answers)
cancel a transaction in MySQL InnoDB instead of commit or rollback
(1 answer)
Closed 3 years ago.
ACID properties of Transaction Properties says that either full transaction occurs or nothing occurs. Lets say I want to stop a happening Transaction.
What is the query for stopping a Transaction before it successfully completed?
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How to set a maximum execution time for a mysql query?
(5 answers)
Closed 4 years ago.
Is there any configuration setting using which long running query can be killed automatically in mysql?
yes you can ! There is two ways of doing it.
In query
It sets a timeout in milliseconds.
SELECT /*+ MAX_EXECUTION_TIME(1000) */ status, count(*) FROM articles GROUP BY status ORDER BY status;
With server variables
SET SESSION MAX_EXECUTION_TIME=2000;
SET GLOBAL MAX_EXECUTION_TIME=2000;
These set a session-wide and global timeout.
I took the answer from this website.
I hope it helped.
I have so far been unsuccessful in getting any Scheduled Events to fire.
MySQL 5.7.14
Global variable event_scheduler is ON
Processlist shows event_scheduler with a status of "Waiting on empty queue"
This is a Master Server with server_id=2 and is replicated to Slaves.
The following query is used to create a scheduled event to clear out the sessions table (this is verbatim). The query itself works.
CREATE EVENT cleanup_session_data
ON SCHEDULE EVERY 1 DAY
ON COMPLETION PRESERVE
DISABLE ON SLAVE
DO
DELETE FROM session_data WHERE created_at < DATE_SUB(NOW(), INTERVAL 1 DAY);
However the Scheduled event simply does not fire.
Turns out the answer was to remove the
DISABLE ON SLAVE
Either it is my own misunderstanding or this does not work as expected. By not including the the EVENT status is "ENABLED" whereas with it included it is "SLAVESIDE_DISABLED"
The EVENTS now fire as expected. They are also not replicated to the SLAVE.
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I'm creating a todo app. I have a status column that receives 1, 2 or 3 (pending, overdue, completed).
Whenever I create a task it is set to pending. The user can mark it as complete. But is there a way to automatically update it to overdue in case it's not completed and due_date is less than today?
You can use MySQL event Scheduler.
Prerequisite:
You have to have event_scheduler ON in your mysql server.
Check whether event scheduler is ON or OFF
SELECT ##event_scheduler;
To turn event_scheduler ON run the following query:
SET GLOBAL event_scheduler = ON;
Note: If you restart MYSQL Server then event scheduler status will be reset unless the following is written in the configuration file.
For Windows: in my.ini file write this under [mysqld] section
[mysqld]
event_scheduler=on
For Linux: in my.cnf file
[mysqld]
event_scheduler=on
Event:
CREATE
EVENT `updateStatusEvent`
ON SCHEDULE EVERY 1 DAY STARTS '2016-08-11 00:00:00'
ON COMPLETION NOT PRESERVE
ENABLE
DO
UPDATE your_table SET status_column = 2 WHERE your_time_column < CURDATE();
The event will be started for the first time at '2016-08-11 00:00:00'
and after that the event will be scheduled in every 1 day interval and will update the status of the corresponding data.
If your version of MySQL supports it (version >= 5.1.6 if I'm not mistaken) you can use Event Scheduler.
CREATE EVENT check_overdue ON SCHEDULE EVERY 2 HOUR DO
UPDATE mytable SET status = 2 WHERE due_date < NOW();
Another option is to set up a Cron job that calls a PHP or another online script.
Anyway you have to query periodically for any overdue events and mark them as overdue.