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I upgraded my modules by calling composer update, then my shop was going offline with the message:

Please upgrade your database: Run "bin/magento setup:upgrade" from the Magento root directory.

Is this showing because my magento is in "developer" mode? Will this exception also show if I am in "production" mode?

I fear that I can only update my modules in 4:30 o'clock in the morning when there is almost no traffic on my shop.

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This is not because of the developer mode and Yes this will also happen on your production if you did composer update or take pull of this code-base

Here is bit of explanation,

bin/magento setup:upgrade is required when module version in code-base is different to that module's version in database

bin/magento setup:upgrade will run install-update(schema/data) and then update module version in database.

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  • So is there no way to update your modules without the shop throwing an exception and being offline? I wonder how big shops like Amazon are doing this.
    – Black
    Commented Feb 21, 2020 at 9:08
  • I don't think so, you can enable maintenance flag while doing this, on frontend customers will see under maintenance page till you process all this Commented Feb 21, 2020 at 9:11
  • Thats a very bad software design by magento. They could make the shop use the old extension until you upgrade the database, to prevent any exceptions... Thanks
    – Black
    Commented Feb 21, 2020 at 9:15
  • Its not that bad, just you have to follow a process, if you have time here are some interesting link to read, inviqa.com/blog/how-achieve-zero-downtime-deployments-magento-2, magento.stackexchange.com/questions/75458/…, these are not full-proof techniques but can minimize your downtime. Commented Feb 21, 2020 at 9:21
  • It is bad, because it should work without any downtime at all, like at Amazon or other big shops.
    – Black
    Commented Feb 21, 2020 at 11:36

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