Drupal Cron Failed To Run Solved

Drupal Cron should run everyday and I was doing some maintenance in one Drupal site when the message "cron failed to run" appeared and here is how I've solve it:

Delete cron variables from the database

DELETE FROM variable WHERE name="cron_semaphore";
DELETE FROM variable WHERE name="cron_last";

Empty cache

Empty cache from /admin/settings/performance and Flush all caches from the administration menu

Optimize all tables

Go to phpmyadmin and check all the tables in your database, select Optimize tables and execute it, wait till is over.
Optimize table is something you should do every now and then to keep the database healthy, it helps to rebuild all the indexes of the Myisam tables.

Then launch cron: cron run successfully.

Comments

  1. AnonymousApril 2, 2013 at 1:01 AM

    thank you
    my cron is ok now

    ReplyDelete
  2. MariaApril 2, 2013 at 12:24 PM

    I'm glad it helped you :)

    ReplyDelete
  3. AnonymousJune 18, 2013 at 6:58 AM

    Nice one.

    Its working for me...

    ReplyDelete
  4. AnonymousJuly 1, 2013 at 9:03 PM

    I also had to clean my search_index table because it was huge (uninstall and install search module)

    and clean boost cache.

    And then it worked, thank you!

    ReplyDelete
  5. MariaJuly 3, 2013 at 7:53 AM

    I'm glas it helped you! Some times Drupal tables need some maintenance and cleanup, like optimizing them

    ReplyDelete
  6. drupalAugust 23, 2013 at 3:18 AM

    cron run failed in drupal 7.22 & drupal 7.23

    ReplyDelete
  7. AnonymousSeptember 11, 2013 at 12:17 PM

    Thanks, it solved my Cron problem :)

    ReplyDelete
  8. AnonymousOctober 15, 2013 at 3:43 PM

    i dont have "cron_semaphore"
    "cron_last"

    and still field :(

    ReplyDelete
  9. MariaOctober 18, 2013 at 9:12 AM

    did you solve it?
    In Extreme cases you can disable the semaphore entirely:
    in common.inc drupal_cron_run()
    //$semaphore = variable_get('cron_semaphore', FALSE);
    $semaphore = FALSE;

    but watch out with this, make a copy of the file first, check and correct errors and then restore the original file

    ReplyDelete
  10. AnonymousOctober 27, 2013 at 2:15 PM

    1st off all find common.inc file on include folder than i edit it like this but its not working

    ReplyDelete
  11. MariaOctober 28, 2013 at 2:59 AM

    I see you have another problem,mmm.. One solution could be:

    Make a copy of your site and data base and install it in your computer, on a local Apache serve, then edit the file settings.php and add these lines at the top:

    error_reporting(E_ALL);
    ini_set('display_errors', TRUE);
    ini_set('display_startup_errors', TRUE);

    Next run cron from your computer like this:
    Open your browser and go http://mylocalhost/cron.php

    All errors should be printed on the screen now



    ReplyDelete
  12. AnonymousJune 14, 2014 at 5:23 PM

    Thank you so much!

    ReplyDelete

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