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I am debugging a checkout problem, where the shipping address is not saved. This can be reproduced only some times and on production, under unclear circumstances.

Checking the logs I found

Serialization failure: 1213 Deadlock found when trying to get lock; try 
  restarting transaction, query was: UPDATE `quote_address` SET ...

And googling I found an post in the Magento community forums, stating that cron_schedule might be involved with deadlocks.

I did a

mysql> select count(*) from cron_schedule;
+----------+
| count(*) |
+----------+
|     3778 |
+----------+
1 row in set (32.83 sec)

And it took very long. So I truncated the problem and seem to be not able to reproduce the problem any more at all (before in maybe 25% of the tries)

The Id column of the cron_schedule was around 14916548, so I am wondering if that is a problem for MySQL / MariaDB (5.5.5-10.0.38-MariaDB-0ubuntu0.16.04.1)?

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