Manual talk:Upgrading to 1.10/de

Mein Upgrade via Web-Installer von 1.9.3 nach 1.10.0 scheitert mit folgenden Meldungen:

Notice: Undefined property: stdClass::$Collation in /www/htdocs/w00776d8/config/index.php on line 850 Notice: Undefined property: stdClass::$Collation in /www/htdocs/w00776d8/config/index.php on line 852 Notice: Undefined property: stdClass::$Collation in /www/htdocs/w00776d8/config/index.php on line 854
 * 1) Warning: Unrecognised existing collation

Adding pr_id field to table page_restrictions...Query "ALTER TABLE `wiki_page_restrictions` ADD COLUMN pr_id int unsigned not null auto_increment,  ADD UNIQUE KEY pr_id (pr_id) " failed with error code "Specified key was too long. Max key length is 500 (localhost)".

Die Rückkehr (Neuinstallation) zu 1.9.3 funktioniert.

Was mache ich falsch?