Database Upgrade Required

Error

Database Upgrade Required 

WordPress has been updated! Before we send you on your way, we have to update your database to the newest version.

The update process may take a little while, so please be patient.

Update WordPress Database

Yes, of-course there will be an option to upgrade database. I clicked on it and that shows a success message:

Update Complete

Your WordPress database has been successfully updated!

Continue

Oops.. That’s not helped yet!

It can occurs due to many reasons. Here we goes with some explanations.
It’s not a big deal. You can safely do the changes without the afraid of data loss. It’s a table related problem. In wordpress database, there is table named “WP_Options” which includes some general information related to the blog which appears in the setting tab of admin. We have to check the following things to troubleshoot this.

1, This might be due to the siteURL mistake in WP_Options table.

Site URL in WP_Options table must be populated to the home page of the website.
You can check this from the PhpMyAdmin.

Log into panel >> Click on PhpMyAdmin >> Select the database from left side >> Click on the table “WP_Options” >> Check the siteURL option.

2, Next is important, check the DB version in version.php file. The DB version should be match with the WordPress version installed.

This can also be done from the PhpMyAdmin “WP_Options” table.

 Also, you can change this from backend. The “version.php” file is located under:

public_html/wp-includes/version.php

Example:

/**
 * The WordPress version string
 *
 * @global string $wp_version
 */$wp_version = '4.2.2';

/**
 * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
 *
 * @global int $wp_db_version
 */$wp_db_version = 31535;