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There are many reasons due to which you are unable to fetch the data from your MySQL database. Following are some common causes for this to happen:

Cause 1:

Incorrect database login credentials. It is possible that database login credentials are changed but not updated in the connection string of the config file.

Fix:

You can open your config file, collect the password and reset it for your database user.

Cause 2:

MySQL service is down/unresponsive. When the website is having too many concurrent connections or bumped with lots of traffic.

Fix:

Please restart the MySQL service to fix it.

Cause 3:

Database table corruption. Sometimes table corruption can result into a database connection error.

Fix:

You can repair the corrupted table from cPanel/phpMyAdmin.

Above mentioned are the common causes. However, if you face any error other than these, you can contact us to diagnose it further. Please raise a support ticket.
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