@ sky writer: thanks for your help
back to the error message
There was an uncatched exception: Unknown MySQL server host 'mysql02:3306' (2) in line (51) of (/framework/class.database.php)
this error comes, if its not possible to connect to the database
, easy to understand, finish...
now the question: why?
1- connection to the database broken exact in this moment, needs only a half second - has nothing to do with this upgrade
2- no mysqli avaiable on this server
3- php-version older PHP 5.3.6
4- upgrade a older WB-Version without the step to WB 2.8.3 Rev 1611 (my favorite)
5- call a second connection to the database in a own script or with a module
this SP6 upgrade's only the delivered core modules and only the modules from the Whitelist-Array (see Post from SkyWriter). its not possible to upgrade any other module without new code for that, so it makes no sense, to use longer the old method with the "Blacklist-Array" - using in older versions of the upgrade-script. Blacklist-Array means: upgrade all modules, but not this from the Blacklist-Array-list.
the Whitelist-Array included all modules from the SP6-Package.
a special case...
if somebody say: i'll not use the new module version, maybe from the form-module, and take this out from the SP6-Package, the upgrade-scripts starts the module upgrade from the old module, if its avaiable in the folder structure.
it makes no sense for me, to use a older core module, but on this way, its possible, to start a old core module upgrade
and to the auto-upgrade or "One-Click-Upgrade"
its not possible to upgrade older wb-version like 2.6.x, 2.7.x, 2.8.0, 2.8.1 or 2.8.2 without a step to the WB 2.8.3 Rev 1611 first. Read the upgrade instructions from ruebenwurzel to see the needed manual work. All this WB-Versions runs in the frontend also with the latest php-version, so their is no pressure to upgrade this
a "one-click-upgrade" is a good solution, if you have the latest version of this software, but it doesnt work, if you use old and very old version