There is some time needed to wait to open db at Replica after creating db file on Master site.
In my case in Replica site, db_env could be opened, but "No such file or directory" error occurred when opening db. So, I applied Line444-459 in \csharp\excs_repquote\RepQuoteExample.cs (sample code) into my application. So, it seems ok now.
Just want to confirm if it (Line444-459) is the best way to open db in Replica. Or any other way.
By the way, this error was not observed with C++, but happens with C#.