Hi, I just tested a big export and we have a problem in 4.0.5, compared to 3.5.8.
In 3.5.8, a normal SQL export starts almost immediately, but in 4.0.5 it stalls and does not complete.
I am testing with the employees.salaries sample table.
I suggest to delay the final 4.0.6 (possibly releasing a 4.0.6-rc2 with a fix for this).