1.세션 Tools > Preferences > Oracle > Connection > Session Mode - Single session (선택) 2.접속유지 Tools > Preferences > Oracle > Connection - Check connection (체크) 3.사용자 이름/비밀번호 저장 Tools > Preferences > Oracle > Logon History > Definition - Store with password (체크) 4.작업파일 백업 Tools > Preferences > Files > Directories > Test scripts - E:\PLSQLDeveloper\test (입력) Tools > Preferences > Files > Directories ..