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.
Related
We have created CRON jobs in MySQL where some run daily and some run monthly.
We can see the list of events(jobs) using the following command -
show events from database_name
To identify the execution of an event, logs table was created, and a record was inserted in the logs table whenever an event was executed.
Even though the event is shown as "enabled", the corn job is not getting executed at the set intervals.
Is there a way to identify if the CRON job is properly configured?
Note: We are using MySQL Workbench.
If yes, please share the details.
Thanks in advance!
I have Mysql database where tasks are inserted. Sometimes they are inserted by 1 or 2 per time, but sometimes they are inserted by 1000 or even more per time. I have workers on multiple servers which are ruled by listeners on these servers. One server = one listener. Listener selects tasks, that are not done yet and that are not in processing right now. It selects an ID of the task and status. If status is empty, then the task is new and we need to proceed id. Then we update the status with an id of server listener (unique) and that means that this server wants to get this task. Then we select tasks using this unique id of the listener and see if there was an attempt of the another listener to do the same at this time. We can see it if the status contains another id. If it is so, we skip the task and continue but if an id is ours we update the status to the processing state indicating our id only if the id in status is ours. After this step we can process the task.
The question is why could happen the situation when some servers process the same tasks? And how to avoid this?
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.
I am new to MYSQL. I have one event scheduler for every 1 hour. Can we create log for every call when it was started and when it was finished and the status (success or failure).
Pls help me.
You can catch the errors with
DECLARE EXIT HANDLER FOR SQLEXCEPTION
or you can use GET DIAGNOSTICS which is available in MySQL 5.6.4
Make a log table and insert timestamps and error returned by handler
I am trying to write an automated test script for testing a MySQL Event that I created, and I am wondering if there is a way to execute some kind of command to force the Event to execute immediately. The Event is set to run daily at midnight, but I don't want the automated test script to have to wait for the Event to trigger.
One way I can think of is to ALTER the Event to have it execute one-time 5 seconds into the future, but I'd like to know if there is a more elegant way to do get it to execute.
Move all the code within the event into a stored procedure
Make the event only call the stored procedure
Test the stored procedure with the CALL syntax.
if it is based on the system time, change that, and see if your event fires, then change the system time back.
Another 'proxy' solution is schedule it ver soon, for example:
ON SCHEDULE EVERY 10 SECOND
(or 1 sec, depends how long in the run time of the event).
you could later drop the event.