SYSTEM SUSPEND COMMAND

제품 : ORACLE SERVER
작성날짜 : 2003-08-04
ALTER SYSTEM SUSPEND 명령은 모든 instance에서 query 뿐 아니라 모든 I/O(datafile,
control file, and file header)를 suspend시킴으로서 현재의 transaction에 상관없이
데이타베이스의 복사가 가능하다. 다른 instance를 suspend하고 있는 동안 새로운
instance를 start하지 않도록 한다. 이것은 새로운 instance는 suspend되지 않기때문이다
정상적인 database 작업을 계속하고자 한다면 alter system resume명령을 주면 된다.
suspend/resume은 디스크나 화일을 mirror하여 split할수 있도록 하는데 유용할수 있다.
만약 writes가 발생하는 동안에 현재의 데이타베이스로부터 mirrored disk를 split할수
없는 시스템을 사용하고 있다면 suspend/resume을 사용하여 가능하도록 할수 있다.
suspended database의 복사는 commit되지 않은 내용을 가지고 있을수 있기때문에
suspend/resume은 일반적인 shutdown 작업의 간편한 대체수단이 아니다.
SUSPEND/RESUME 문장은 각기 다른 instance에서 수행할 수 있다. 예를 들면
만약 instance 1, 2, 3이 running 중이고 instance 1에서 SUSPEND 명령을 수행한 후
instance 1,2 또는 3 모두에서 resume 명령을 수행할 수 있다.
** SUSPEND와 RESUME 명령을 수행하는 단계
1. ALTER TABLESPACE BEGIN BACKUP명령을 이용하여 database tablespace를
hot backup mode에 놓는다.
2. 만약 DISK write가 발생하는 상황에서 mirror를 split하는데 문제가 있다면
ALTER SYSTEM SUSPEND명령을 수행한다.
3. MIRROR를 split한다.
4. database를 다시 진행하기 위하여 ALTER SYSTEM RESUME 명령을 사용한다.
5. ALTER TABLESPACE END BACKUP 명령을 수행함으로써 tablespace의 hot backup mode
에서 정상 모드로 변환한다.
6. 일반적인 백업에서와 같이 control file과 online redolog들을 백업 받는다.
Note: SUSPEND 명령을 tablespace를 hot backup mode로 전환하는 것의 대체용으로
사용하지 않는다.
Reference Documents
<Note:91059.1>

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