[20170302]正常關閉資料庫日志丢失3.txt
--//到最後恢複結束時fuzzy=NO,這時scn=13276966782.也就是将隻有恢複到結束,oracle才會認為資料檔案一緻的.
--//我本來想删除日志檔案看看是否能open resetlogs的,結果報錯.
--//下午重新探究看看:
1.環境:
SYS@book> @ &r/ver
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
--//正常關閉資料庫,做一個冷備份,然後删除日志檔案.
$ rm /mnt/ramdisk/book/r*.log
2..測試:
SYS@book> startup mount
ORACLE instance started.
Total System Global Area 634732544 bytes
Fixed Size 2255792 bytes
Variable Size 197133392 bytes
Database Buffers 427819008 bytes
Redo Buffers 7524352 bytes
Database mounted.
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header;
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ------- ---------------- --- ------------------------------- ------------------------------
1 13276932032 2017-03-02 14:57:02 7 925702 ONLINE 842 NO /mnt/ramdisk/book/system01.dbf SYSTEM
2 13276932032 2017-03-02 14:57:02 1834 925702 ONLINE 831 NO /mnt/ramdisk/book/sysaux01.dbf SYSAUX
3 13276932032 2017-03-02 14:57:02 923328 925702 ONLINE 752 NO /mnt/ramdisk/book/undotbs01.dbf UNDOTBS1
4 13276932032 2017-03-02 14:57:02 16143 925702 ONLINE 837 NO /mnt/ramdisk/book/users01.dbf USERS
5 13276932032 2017-03-02 14:57:02 952916 925702 ONLINE 748 NO /mnt/ramdisk/book/example01.dbf EXAMPLE
6 13276932032 2017-03-02 14:57:02 13276257767 925702 ONLINE 216 NO /mnt/ramdisk/book/tea01.dbf TEA
6 rows selected.
--//FUZZY=NO.
SYS@book> @ &r/logfile
GROUP# STATUS TYPE MEMBER IS_ GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIME NEXT_CHANGE# NEXT_TIME
------ ------ ---------- -------------------------------- --- ------ ------- --------- ----------- --------- ------- --- ---------- ------------- ------------------- ------------ -------------------
1 ONLINE /mnt/ramdisk/book/redo01.log NO 1 1 695 52428800 512 1 YES INACTIVE 13276910949 2017-02-28 14:40:12 13276931102 2017-03-02 14:56:08
2 ONLINE /mnt/ramdisk/book/redo02.log NO 2 1 696 52428800 512 1 NO CURRENT 13276931102 2017-03-02 14:56:08 2.814750E+14
3 ONLINE /mnt/ramdisk/book/redo03.log NO 3 1 694 52428800 512 1 YES INACTIVE 13276910486 2017-02-28 14:40:06 13276910949 2017-02-28 14:40:12
4 STANDBY /mnt/ramdisk/book/redostb01.log NO
5 STANDBY /mnt/ramdisk/book/redostb02.log NO
6 STANDBY /mnt/ramdisk/book/redostb03.log NO
7 STANDBY /mnt/ramdisk/book/redostb04.log NO
7 rows selected.
SYS@book> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-01139: RESETLOGS option only valid after an incomplete database recovery
--//嗯,^_^不能通過open resetlogs;,才想起來要采用alter database clear logfile group N的方式,沒有歸檔執行:
--//alter database clear unarchived logfile group N ;這樣不用open resetlogs.
3.恢複:
--//我記憶裡使用上面的方法我以前是失敗的,我采用建立新的控制檔案方式(resetlogs)方式建立.
--//那個時候剛剛學oracle,什麼都不懂,完全是依葫蘆畫瓢.再次使用alter database clear logfile group N方式.
--//說明:目前的情況 status=CURRENT,是group#=2.
SYS@book> alter database clear logfile group 1 ;
Database altered.
SYS@book> alter database clear logfile group 2 ;
alter database clear logfile group 2
ORA-00350: log 2 of instance book (thread 1) needs to be archived
ORA-00312: online log 2 thread 1: '/mnt/ramdisk/book/redo02.log'
--//這個必須歸檔,不能這樣執行.
SYS@book> alter database clear unarchived logfile group 2 ;
SYS@book> alter database clear logfile group 3 ;
--//ok,以前為什麼不行呢?我仔細看了我以前做的文檔,才明白我的錯誤.
4.重複測試:
--//從冷備份恢複,删除redo.
SYS@book> alter database clear unarchived logfile group 2 ;
alter database clear unarchived logfile group 2
ORA-00313: open failed for members of log group 3 of thread 1
ORA-00312: online log 3 thread 1: '/mnt/ramdisk/book/redo03.log'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
--//注意看提示,當時就是沒有看提示,提示無法獲得/mnt/ramdisk/book/redo03.log的狀态.實際上如果你執行很快,一樣報錯.
$ cat /tmp/a.txt
alter database clear logfile group 1 ;
alter database clear unarchived logfile group 2 ;
--//注:沒有包括clear logfile group 3 ;
SYS@book> @ /tmp/a.txt
alter database clear unarchived logfile group 2
--//依舊是報無法獲得/mnt/ramdisk/book/redo03.log狀态.
--//而這個時候你在手工執行:
--//一樣報錯.
GROUP# STATUS TYPE MEMBER IS_ GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIME NEXT_CHANGE# NEXT_TIME
------ ---------- ---------- -------------------------------- --- ------ ------- --------- ----------- --------- ------- --- ---------- ------------- ------------------- ------------ -------------------
1 ONLINE /mnt/ramdisk/book/redo01.log NO 1 1 0 52428800 512 1 YES UNUSED 1.3277E+10 2017-02-28 14:40:12 1.3277E+10 2017-03-02 14:56:08
2 ONLINE /mnt/ramdisk/book/redo02.log NO 2 1 0 52428800 512 1 NO CLEARING_C 1.3277E+10 2017-03-02 14:56:08 2.8147E+14
URRENT
3 ONLINE /mnt/ramdisk/book/redo03.log NO 3 1 0 52428800 512 1 YES UNUSED 0 2017-02-28 14:40:06 0 2017-02-28 14:40:12
4 STANDBY /mnt/ramdisk/book/redostb01.log NO
5 STANDBY /mnt/ramdisk/book/redostb02.log NO
6 STANDBY /mnt/ramdisk/book/redostb03.log NO
7 STANDBY /mnt/ramdisk/book/redostb04.log NO
GROUP# STATUS TYPE MEMBER IS_ GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIME NEXT_CHANGE# NEXT_TIME
------ ------ ---------- ------------------------------- --- ------ ------- --------- ----------- --------- ------- --- ---------- ------------- ------------------- ------------ -------------------
1 ONLINE /mnt/ramdisk/book/redo01.log NO 1 1 697 52428800 512 1 NO CURRENT 13276931103 2017-03-02 15:26:41 2.814750E+14
2 ONLINE /mnt/ramdisk/book/redo02.log NO 2 1 0 52428800 512 1 YES UNUSED 13276931102 2017-03-02 14:56:08 13276931103 2017-03-02 15:26:41
3 ONLINE /mnt/ramdisk/book/redo03.log NO 3 1 0 52428800 512 1 YES UNUSED 0 2017-02-28 14:40:06 0 2017-02-28 14:40:12
4 STANDBY /mnt/ramdisk/book/redostb01.log NO
5 STANDBY /mnt/ramdisk/book/redostb02.log NO
6 STANDBY /mnt/ramdisk/book/redostb03.log NO
7 STANDBY /mnt/ramdisk/book/redostb04.log NO
--//SEQUENCE#=697使用group#=1.實際上執行alter database clear unarchived logfile group 2 ;要找一個新的redo配置設定seq,而不知
--//道為什麼oracle一定要先/mnt/ramdisk/book/redo03.log,當然這個是開始SEQUENCE#=694最小的.
--//當時的錯誤就是沒有認真看提示.
5.再重複測試:
alter database clear logfile group 3 ;
GROUP# STATUS TYPE MEMBER IS_ GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIME NEXT_CHANGE# NEXT_TIME
------ ---------- ---------- ------------------------------- --- ------ ------- --------- ----------- --------- ------- --- ---------- ------------- ------------------- ------------ -------------------
1 ONLINE /mnt/ramdisk/book/redo01.log NO 1 1 697 52428800 512 1 NO CURRENT 13276931103 2017-03-02 15:33:48 2.814750E+14
2 ONLINE /mnt/ramdisk/book/redo02.log NO 2 1 0 52428800 512 1 YES UNUSED 13276931102 2017-03-02 14:56:08 13276931103 2017-03-02 15:33:48
3 ONLINE /mnt/ramdisk/book/redo03.log NO 3 1 0 52428800 512 1 YES UNUSED 13276910486 2017-02-28 14:40:06 13276910949 2017-02-28 14:40:12
4 STANDBY /mnt/ramdisk/book/redostb01.log NO
5 STANDBY /mnt/ramdisk/book/redostb02.log NO
6 STANDBY /mnt/ramdisk/book/redostb03.log NO
7 STANDBY /mnt/ramdisk/book/redostb04.log NO
--//OK!!
--//我反複測試多次,隻要執行時沒有報如下錯誤.什麼執行都是ok的.一旦報了這個錯誤必須先清除group 3,再執行alter database
--//clear unarchived logfile group 2.才會ok,當時太不注意看提示了.^_^.
5.再再重複測試:
SYS@book> @ /tmp/a.txt
1 ONLINE /mnt/ramdisk/book/redo01.log NO 1 1 0 52428800 512 1 YES UNUSED 13276910949 2017-02-28 14:40:12 13276931102 2017-03-02 14:56:08
2 ONLINE /mnt/ramdisk/book/redo02.log NO 2 1 0 52428800 512 1 YES UNUSED 13276931102 2017-03-02 14:56:08 13276931103 2017-03-02 15:44:59
3 ONLINE /mnt/ramdisk/book/redo03.log NO 3 1 697 52428800 512 1 NO CURRENT 13276931103 2017-03-02 15:44:59 2.814750E+14
--//這時的SEQUENCE#=697,是GROUP#=3.
--//也就是清除順序最好按照SEQUENCE#的順序,從小到大(694,695,696),最後清除沒有歸檔的線上日志.當然你也可以重新組織順序.
--//再次說明提示要認真看.教訓啊.
SYS@book> alter database open ;
--//ok,正常打開.
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