CMS How can I disable Drupal CSS aggregation?

My server is causing errors in phpmyadmin and I can’t access that.

Simply use drush.
Many are confusing for version 7 and 8. There are two different processes for difeerent versions.

If you have Drupal version 7 then,

Code:

drush vset preprocess_js 0

If you have Drupal version 8 then,

Code:

drush -y config-set system.performance css.preprocess 0

Those are for CSS aggregation, if you need for JS then just replace css with js.

Code:

drush -y config-set system.performance js.preprocess 0

Hope this solves :-)