■ system data file 손상되었을 경우, backup 하는 방법 #) redo log 정보 SELECT a.group#, b.sequence#, a.member, b.bytes/1024/1024 MB, b.archived, b.status, b.first_time, b.first_change#, b.next_change# FROM v$logfile a, v$log b WHERE a.group# = b.group# ORDER BY 1; #) 샘플 테이블 생성 SYS@ora11g> create table hr.emp_20240124 tablespace users as select * from hr.employees; select count(*) from hr.emp_20240124; #) 로그 스..