Many duplicate pending cron jobs in cron_schedule table

[Andy_Acute]

I'm using Magento 2.3.3 (this issue was reported as fixed in Magento 2.2)

I'm seeing many duplicated scheduled cron jobs in the cron_schedule database table.

Recently I had to TRUNCATE the table because it was huge and slowing the website down.

I can see this building up again over time.

Anyone know why the pending jobs are duplicating and how to stop this table bloating please?

Many Thanks in Advance

Andy

[Nishu Jindal]

Hi @Andy_Acute ,

I found one solution on one of the forum response. Please try the same.

I was also confused with this issue where magento is creatin multiple entries for same jobcode and I am able to fix it.

I have created the job schedule for 15 min on server 
https://prnt.sc/p57rci

and made these setting in admin
https://prnt.sc/p57rml

After making this setting I get all records success without any pending or missed.
https://prnt.sc/p57qm3

You can write custom script in php file to delete entries from cron_schedule table which are completed.

Hope this helps you!

Problem Solved! Click Kudos & Accept as Solution!

[Andy_Acute]

Hi Nishu

Thank you for your response.

having dug a little deeper, I can see that some of my third party extension crons are not being added to the schedule at all. This is in addition to the duplicate jobs being added.

I'm going to post a new question regarding the whole cron process as there seems a lot of confusion on how the configuration works.

Thanks again for replying

Andy

[jason_liu4]

I have the exact same issue, did you find out any solution yet? Thank you.

[jason_liu4]

You will need to register the `bin/magento cron:run` in your system cron job. Magento will not automatically run this command nor the job registered in the cron_scheduled table. I have the same issue the I can see there are contents in job_scheduled table but not get executed, the status remains pending.