Redo aws 사이즈조정
DB CAFE
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- DBA { Oracle DBA 명령어 > DBA 초급 과정 > DBA 고급 과정 }
- 튜닝 { 오라클 튜닝 목록 }
- 모델링 { 데이터 모델링 가이드 }
목차
1 AWS REDO 로그 사이즈 변경[편집]
- 128MB 로그 파일을 512MB로 변경하기
1.1 현재 로그 확인[편집]
/* Query V$LOG to see the logs. */ /* You start with 4 logs of 128 MB each. */
select GROUP#, BYTES, STATUS from V$LOG;
GROUP# BYTES STATUS
---------- ---------- ----------------
1 134217728 INACTIVE
2 134217728 CURRENT
3 134217728 INACTIVE
4 134217728 INACTIVE
1.2 로그파일 추가(512MB)[편집]
/* Add four new logs that are each 512 MB */
AWS >>>>
exec rdsadmin.rdsadmin_util.add_logfile(bytes => 536870912);
exec rdsadmin.rdsadmin_util.add_logfile(bytes => 536870912);
exec rdsadmin.rdsadmin_util.add_logfile(bytes => 536870912);
exec rdsadmin.rdsadmin_util.add_logfile(bytes => 536870912);
- 오라클 명령
-- 그룹추가
alter database add logfile group 4
'/app/oracle/oradata/testdb/redo04_a.log' size 5M ;
-- 멤버추가
alter database add logfile member
'/app/oracle/oradata/testdb/redo04_b.log' to group 4 ;
/* Query V$LOG to see the logs. */ /* Now there are 8 logs. */
select GROUP#, BYTES, STATUS from V$LOG;
GROUP# BYTES STATUS
---------- ---------- ----------------
1 134217728 INACTIVE
2 134217728 CURRENT
3 134217728 INACTIVE
4 134217728 INACTIVE
5 536870912 UNUSED
6 536870912 UNUSED
7 536870912 UNUSED
8 536870912 UNUSED
1.3 128MB사이즈 로그 파일 삭제[편집]
/* Drop each inactive log using the group number. */ /* 2번은 사용중이므로 삭제 불가 */
AWS >>>>
exec rdsadmin.rdsadmin_util.drop_logfile(grp => 1);
exec rdsadmin.rdsadmin_util.drop_logfile(grp => 3);
exec rdsadmin.rdsadmin_util.drop_logfile(grp => 4);
--멤버 삭제
alter database drop logfile member
'/app/oracle/oradata/testdb/redo04_b.log' ;
-- 그룹삭제
alter database drop logfile group 4;
/* Query V$LOG to see the logs. */ /* Now there are 5 logs. */
select GROUP#, BYTES, STATUS from V$LOG;
GROUP# BYTES STATUS
---------- ---------- ----------------
2 134217728 CURRENT
5 536870912 UNUSED
6 536870912 UNUSED
7 536870912 UNUSED
8 536870912 UNUSED
/* Switch logs so that group 2 is no longer current. */
1.4 스위치 로그 발생[편집]
AWS >>>>
exec rdsadmin.rdsadmin_util.switch_logfile;
alter system switch logfile;
/* Query V$LOG to see the logs. */ /* Now one of the new logs is current. */
SQL>select GROUP#, BYTES, STATUS from V$LOG;
GROUP# BYTES STATUS
---------- ---------- ----------------
2 134217728 ACTIVE
5 536870912 CURRENT
6 536870912 UNUSED
7 536870912 UNUSED
8 536870912 UNUSED
1.5 체크포인트 발생[편집]
/* Issue a checkpoint to clear log 2. */
AWS >>>>
exec rdsadmin.rdsadmin_util.checkpoint;
alter system checkpoint;
/* Query V$LOG to see the logs. */ /* Now the final original log is inactive. */
select GROUP#, BYTES, STATUS from V$LOG;
GROUP# BYTES STATUS
---------- ---------- ----------------
2 134217728 INACTIVE
5 536870912 CURRENT
6 536870912 UNUSED
7 536870912 UNUSED
8 536870912 UNUSED
- Drop the final inactive log.
AWS >>>>
exec rdsadmin.rdsadmin_util.drop_logfile(grp => 2);
/* Query V$LOG to see the logs. */ /* Now there are four 512 MB logs. */
select GROUP#, BYTES, STATUS from V$LOG;
GROUP# BYTES STATUS
---------- ---------- ----------------
5 536870912 CURRENT
6 536870912 UNUSED
7 536870912 UNUSED
8 536870912 UNUSED