In which database-table could I select the information of the documentation tab?
1 - If you are referring to the list of versions (Documentation > Version Management):
These are contained in the OH table. Objects listed there have theOH_Deleteflagfield set to '2', so an easy way to get the list is to search objects that have this value.
2 - If you are thinking of the 'Documentation > Docu' tab:
Then the information is contained in theODOC table. However the 'ODOC_content' field is in binary type and will need to be converted to 'VARCHAR' in order to be understandable.