https://docs.oracle.com/cd/E17276_01/html/api_reference/CXX/envset_lk_tablesize.html
DbEnv::set_lk_tablesize()
setlk
https://docs.oracle.com/cd/E17276_01/html/api_reference/CXX/mutexstat.html
DbEnv::mutex_stat()
mutexstat
https://docs.oracle.com/cd/E17276_01/html/api_reference/CXX/logcursor.html
DbEnv::log_cursor()
logcursor