Database backup DMP file, but all the table under the tables according to the tutorial to delete only can import the DMP file, the result may be the system table deleted or foreign key problem, cause now click on the tables or restore old error table SQL recursive error 1 there is no this table or view, with the front sys removed, should use cbz8600 this number, lead to not return to table can see now, you can find it on the recycle bin but lose bad recovery is also submitted to the recursive SQL commands and without the table or view, I don't know what to do