Symptoms
Joomla site loads for a long time and resulting into blank page.
Joomla admin page throws SQL errors similar to the following:
Table 'db1234567_sa1775_main.jos_session' doesn't exist SQL=INSERT INTO `jos_session` (`session_id`, `client_id`, `time`) VALUES ('17fc840383b1936a2cf749a0cafdf4f1', 1, '1378498151')
Cause
Joomla DB misconfiguration.
Resolution
Access the webspace where Joomla SiteApp is installed and check Joomla configuration file for DB credentials:
D:\CustomerData\webspaces\webspace_00123456\wwwroot\configuration.php
public $user = 'u1234567_username';
public $password = '*****';
public $db = 'db1234567_databasename';
public $dbprefix = 'mydbprefix_';
Make sure that the database in configuration is correct one. If not, specify the correct database name and credentials.
If the database is correct in configuration file, this means that the database itself is broken.
It can be restored from backup or fixed manually if possible. Joomla is not developed by Parallels and Parallels support will not be able to assist in fixing the issue.
Joomla site application can also be reinstalled from scratch. Note that application's data will be lost in this case.