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We have been experiencing the issue of My SQL Gone Away while doing the setup:upgrade of Magento. We have been seeing this error on while doing setup:upgrade and the occurrence of this, is happening when there is ALTER command happening.

MySQL server has gone away in /var/www/html/vendor/magento/zendframework1/library/Zend/Db/Statement/Pdo.php on line 228

Our observation is when ever we do a Setup:Upgrade after we change anything in db_schema.xml, it starts doing ALTER in almost of every pre built tables, even if there are no changes in those changes from our code.

What my question is

  1. What is the use of ALTER query on not changed tables everytime we do a setup:upgrade?
  2. Can we push our DB changes without doing setup:upgrade and what is the impact of this in Magento?
  3. What exact changes needs Setup:upgrade? Is it only DB changes or something else?

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