COLD BACKUP을 받은 후 ARCHIVE LOG로 변환하여 사용한 경우 INCOMPLETE RECOVERY.

Question

제품 : ORACLE SERVER
작성날짜 : 2002-04-09
COLD BACKUP을 받은 후 ARCHIVE LOG로 변환하여 사용한 경우 INCOMPLETE RECOVERY.
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PURPOSE
COLD BACKUP을 받은 후 ARCHIVE LOG MODE로 변환하여 사용한 경우의 RECOVERY
과정을 TEST로 확인하여 본다.
Examples
No Archive log mode.
SQL> select * from tab ;
TNAME TABTYPE CLUSTERID
EMP TABLE
EMP1 TABLE
EMP2 TABLE
EMP3 TABLE
EMP4 TABLE
10 rows selected.
SQL> select count(*) from emp3 ;
COUNT(*)
0
SQL> select count(*) from emp4 ;
COUNT(*)
0
Cold backup을 받은후 Archive log mode 변경한 경우
SVRMGR> startup mount
SVRMGR> archive log list
Database log mode No Archive Mode
Automatic archival Enabled
Archive destination D:\Oracle\oradata\SNAP\archive
Oldest online log sequence 26
Current log sequence 28
SVRMGR> alter database archivelog ;
SVRMGR> alter database open ; => archive log mode 변경.
SQL> select * from tab ;
TNAME TABTYPE CLUSTERID
EMP TABLE
EMP1 TABLE
EMP2 TABLE
EMP3 TABLE
EMP4 TABLE
10 rows selected.
SQL> insert into emp3 select * from emp ;
14 rows created.
SQL> commit ;
Commit complete.
SQL> insert into emp4 select * from emp1 ;
71680 rows created.
SQL> commit ;
Commit complete.
SQL> select count(*) from emp3 ;
COUNT(*)
14
SQL> select count(*) from emp4 ;
COUNT(*)
71680
## log switch 발생.
SVRMGR> alter system switch logfile ;
SQL> insert into emp3 select * from emp ; -- current log에 반영.
14 rows created.
SQL> commit ;
SQL> select count(*) from emp3 ;
COUNT(*)
28
SQL> select count(*) from emp4 ;
COUNT(*)
71680
# ALL DATABASE CRASH #
# recover 과정... #
1. Restore Cold-backup
2. modify initSID.ora
log_archive_start = true
log_archive_dest_1 = "location=D:\Oracle\oradata\SNAP\archive"
log_archive_format = %%ORACLE_SID%%T%TS%S.ARC
3. svrmgrl
Statement processed.
SVRMGR> startup mount
ORACLE instance started.
Total System Global Area 40703244 bytes
Fixed Size 70924 bytes
Variable Size 23777280 bytes
Database Buffers 16777216 bytes
Redo Buffers 77824 bytes
Database mounted.
SVRMGR> archive log list
Database log mode No Archive Mode
Automatic archival Enabled
Archive destination D:\Oracle\oradata\SNAP\archive
Oldest online log sequence 26
Current log sequence 28
SVRMGR> alter database archivelog ;
Statement processed.
SVRMGR> recover database using backup controlfile until cancel ;
ORA-00279: change 340421 generated at 04/29/2001 23:42:20 needed for thread 1
ORA-00289: suggestion : D:\ORACLE\ORADATA\SNAP\ARCHIVE\SNAPT001S00028.ARC
ORA-00280: change 340421 for thread 1 is in sequence #28
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
Log applied.
ORA-00279: change 340561 generated at 04/29/2001 23:47:29 needed for thread 1
ORA-00289: suggestion : D:\ORACLE\ORADATA\SNAP\ARCHIVE\SNAPT001S00029.ARC
ORA-00280: change 340561 for thread 1 is in sequence #29
ORA-00278: log file 'D:\ORACLE\ORADATA\SNAP\ARCHIVE\SNAPT001S00028.ARC' no longe
r needed for this recovery
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
Log applied.
ORA-00279: change 340642 generated at 04/29/2001 23:47:35 needed for thread 1
ORA-00289: suggestion : D:\ORACLE\ORADATA\SNAP\ARCHIVE\SNAPT001S00030.ARC
ORA-00280: change 340642 for thread 1 is in sequence #30
ORA-00278: log file 'D:\ORACLE\ORADATA\SNAP\ARCHIVE\SNAPT001S00029.ARC' no longe
r needed for this recovery
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
Log applied.
ORA-00279: change 340723 generated at 04/29/2001 23:47:40 needed for thread 1
ORA-00289: suggestion : D:\ORACLE\ORADATA\SNAP\ARCHIVE\SNAPT001S00031.ARC
ORA-00280: change 340723 for thread 1 is in sequence #31
ORA-00278: log file 'D:\ORACLE\ORADATA\SNAP\ARCHIVE\SNAPT001S00030.ARC' no longe
r needed for this recovery
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
Log applied.
ORA-00279: change 340797 generated at 04/29/2001 23:48:01 needed for thread 1
ORA-00289: suggestion : D:\ORACLE\ORADATA\SNAP\ARCHIVE\SNAPT001S00032.ARC
ORA-00280: change 340797 for thread 1 is in sequence #32
ORA-00278: log file 'D:\ORACLE\ORADATA\SNAP\ARCHIVE\SNAPT001S00031.ARC' no longe
r needed for this recovery
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
cancel
Media recovery cancelled.
SVRMGR> alter database open resetlogs ;
Statement processed.
SVRMGR>
SQL> connect scott/tiger
SQL> select count(*) from emp3 ;
COUNT(*)
14
SQL> select count(*) from emp4 ;
COUNT(*)
71680
# 결론...... #
따라서 current log file에 기록된 14 row에 대한 부분은 recover가 될수
없지만 archive log file에 적용된 log에 대한 data는 정상적으로 복구가
가능하다.
# 주의 사항 #
cold backup을 restore한 후 database open후 shutdown 한 다음 archive
log mode로 변경하여 recover를 진행하는 경우 SCN number가 변경되기
때문에 ora-600 error가 발생하며 media recovery를 필요로 하기 때문에
주의하여야 한다.
SVRMGR> startup
ORACLE instance started.
Total System Global Area 40703244 bytes
Fixed Size 70924 bytes
Variable Size 23777280 bytes
Database Buffers 16777216 bytes
Redo Buffers 77824 bytes
Database mounted.
Database opened.
SVRMGR> shutdown
Database closed.
Database dismounted.
ORACLE instance shut down.
SVRMGR> startup mount
ORACLE instance started.
Total System Global Area 40703244 bytes
Fixed Size 70924 bytes
Variable Size 23777280 bytes
Database Buffers 16777216 bytes
Redo Buffers 77824 bytes
Database mounted.
SVRMGR> alter database archivelog ;
Statement processed.
SVRMGR> recover database using backup controlfile until cancel ;
ORA-00279: change 339542 generated at 04/29/2001 23:30:57 needed for thread 1
ORA-00289: suggestion : D:\ORACLE\ORADATA\SNAP\ARCHIVE\SNAPT001S00003.ARC
ORA-00280: change 339542 for thread 1 is in sequence #3
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
ORA-00283: recovery session canceled due to errors
ORA-00600: internal error code, arguments: [3020], [8390146], [1], [3], [143], [
240], [], []
SVRMGR> exit
Server Manager complete.
Rederence Documents
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Answer 1