If you have confirmed WP config If the database connection information of PHP is correct and the MySQL database is running normally, we should check whether there is data table damage in the database.
Due to the continuous change of plug-ins and themes, or the installation of incorrectly coded or poorly coded plug-ins in the WordPress website, or the large amount of article data, these may lead to database damage.
To find out which table in the database is damaged, we can generally log in to the visual database management interface such as phpMyAdmin to check. If we see that the size of a table is obviously inconsistent with the actual data, or there is a prompt “in use” (it seems that this sentence is not clearly remembered), we can download and back up the database first, and then select the table, Use built-in repair functions such as phpMyAdmin to repair.