db file update and bug fix #491

Job	Run time
7.0/ubuntu-20.04/gcc/default/	1m 34s
7.0/ubuntu-20.04/gcc/static/	1m 25s
3.15/ubuntu-20.04/gcc/default/	1m 55s
3.14/ubuntu-20.04/gcc/default/	1m 51s
7.0/ubuntu-20.04/gcc/static/CMD_CXXFLAGS=-std=c++11	1m 44s
7.0/ubuntu-20.04/clang/default/CMD_CXXFLAGS=-std=c++11	1m 40s
7.0/ubuntu-20.04/gcc/default4.10/	1m 45s
7.0/ubuntu-20.04/gcc/default4.9/	1m 43s
7.0/ubuntu-20.04/gcc-8/default/	1m 38s
7.0/ubuntu-20.04/clang/default/	1m 18s
7.0/ubuntu-latest/gcc/default/	1m 18s
	17m 51s

Provide feedback