PHP-FPM Does PHP-FPM have connection pooling for MySQL?

Using this now on my new server

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By the way, after enabling this I experienced:

 

On php-fpm request end, the MySQL connection is cleaned up which clears any outstanding transactions or locks. This shouldn't be making a difference unless you are on a very old version of php.

Howvere, this can naturally happen due to how XenForo uses transactions and will sometimes mix ordering of how it accesses tables.

For example, if a user deletes a couple of posts quickly from a very long thread this can easily trigger it depending on conditions.

 

PHP 7.0.4 here.

I only experienced it though once I enable debug mode on admin page.

 

I don't have any issue with this on my testing setup in debug mode. But it doesn't have the load of a real website which may be causing issues.