Unable to access Horde webmail after upgrading Plesk: Base table or view not found: 1051 Unknown table

Symptoms

• After a Plesk upgrade, it is not possible to access Horde webmail with the following error message in a web-browser:

  PLESK_INFO: Base table or view not found

• The following error messages appear in the Horde logfile /var/log/psa-horde/psa-horde.log:

  CONFIG_TEXT: HORDE [horde] SQL QUERY FAILED: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'horde.rampage_types' doesn't exist
  SELECT type_id, type_name FROM `rampage_types` WHERE type_name IN
  ('calendar','event') [pid 54636 on line 815 of "/usr/share/psa-pear/pear/php/Horde/Db/Adapter/Base.php"]
  Base table or view not found: 1051 Unknown table 'horde_vfs_seq'
  Base table or view not found: 1051 Unknown table 'horde_muvfs_seq'
  Base table or view not found: 1051 Unknown table 'kronolith_shares_seq'
  Base table or view not found: 1051 Unknown table 'kronolith_resources_seq'

  ---

  CONFIG_TEXT: HORDE [horde] SQLSTATE[42S22]: Column not found: 1054 Unknown column 'attribute_color' in 'field list' [pid 21827 on line 1601 of "/usr/share/psa-pear/pear/php/Horde/Registry.php"]

Cause

The Horde database is corrupted.

Resolution

1. Connect to the Plesk server via SSH.

2. For security reasons, create a backup of the Horde database:

   # plesk db dump horde > /root/horde_dump.sql

3. Reinstall Horde using this KB article.