[20170302]fuzzy保存在那里.txt
--参考链接:http://blog.itpub.net/267265/viewspace-2134551/
--提到fuzzy表示某种状态,正常关闭是NO.
--从访问的视图看v$datafile_header,应该这个信息保存在数据文件头,找找具体的位置在那里.
1.环境:
SYS@book> @ &r/ver
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
--//从冷备份拷贝回来,我这个冷备份是异常关机的.利用异常恢复scn到那里3介绍的方法:
--//链接:http://blog.itpub.net/267265/viewspace-2134595/
recover database until change 13276911100;
recover database ;
--//这样2中恢复方式,fuzzy前者是yes,后者是no.通过对比是否可以确定问题.
2.测试1:
SYS@book> recover database until change 13276911100;
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/mnt/ramdisk/book/system01.dbf'
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header where file#=1;
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ---------- ---------------- --- -------------------------------------------------- ------------------------------
1 13276911100 2017-02-28 14:42:35 7 925702 ONLINE 838 YES /mnt/ramdisk/book/system01.dbf SYSTEM
SYS@book> shutdown immediate ;
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
$ cp /mnt/ramdisk/book/tea01.dbf /u01/backup/fuzzy/tea01.dbf_yes
3.测试2:
SYS@book> recover database ;
Media recovery complete.
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header where file#=1;
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ---------- ---------------- --- -------------------------------------------------- ------------------------------
1 13276931100 2017-02-28 14:42:35 7 925702 ONLINE 839 NO /mnt/ramdisk/book/system01.dbf SYSTEM
--//关闭数据库分析.
$ cp /mnt/ramdisk/book/tea01.dbf /u01/backup/fuzzy/tea01.dbf_no
4.对比:
$ dd if=tea01.dbf_yes of=yes.dd bs=8192 skip=1 count=1
1+0 records in
1+0 records out
8192 bytes (8.2 kB) copied, 0.000102445 seconds, 80.0 MB/s
$ dd if=tea01.dbf_no of=no.dd bs=8192 skip=1 count=1
1+0 records in
1+0 records out
8192 bytes (8.2 kB) copied, 9.2346e-05 seconds, 88.7 MB/s
$ xxd -c 16 yes.dd > yes.txt
$ xxd -c 16 no.dd > no.txt
$ diff yes.txt no.txt
2c2
< 0000010: d5ce 0000 0000 0000 0004 200b 6e21 b74f 瘴........ .n!.O
---
> 0000010: 8693 0000 0000 0000 0004 200b 6e21 b74f .......... .n!.O
9,10c9,10
< 0000080: 0000 0000 0000 0000 0000 0400 d400 0000 ............?..
< 0000090: 4974 e237 d300 0000 0000 0000 0000 0000 It??..........
---
> 0000080: 0000 0000 0000 0000 0000 0000 d500 0000 ............?..
> 0000090: dc74 e237 d400 0000 0000 0000 0000 0000 躷??..........
24c24
< 0000170: 0600 0000 0000 0000 0000 0000 0000 0000 ................
---
> 0000170: 0600 0000 0000 0000 0000 0000 fe1b da37 ............??
31c31
< 00001e0: 0000 0000 fc95 5d17 0300 0000 dbbb db37 ....?].....??
---
> 00001e0: 0000 0000 1ce4 5d17 0300 0000 dbbb db37 .....鋆.....??
--通过bbed观察:
--ub2 chkval_kcbh @16 0x9386 -->检查和
--ub4 kcvfhcpc @140 0x000000d5 => d5 = 213 检查记数
--ub4 kcvfhrts @144 0x37e274dc
--ub4 kcvfhrft @380 0x37da1bfe
--//猜测这个可能性最大:
BBED> p kcvfhsta
ub2 kcvfhsta @138 0x0000 (NONE)
BBED> assign kcvfhsta=0x0040
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
ub2 kcvfhsta @138 0x0040 (NONE)
BBED> sum apply
Check value for File 6, Block 1:
current = 0x93c6, required = 0x93c6
SYS@book> SELECT file#, CHECKPOINT_CHANGE#, CHECKPOINT_TIME,CREATION_CHANGE# , RESETLOGS_CHANGE#,status, CHECKPOINT_COUNT,fuzzy,name,tablespace_name FROM v$datafile_header;
FILE# CHECKPOINT_CHANGE# CHECKPOINT_TIME CREATION_CHANGE# RESETLOGS_CHANGE# STATUS CHECKPOINT_COUNT FUZ NAME TABLESPACE_NAME
----- ------------------ ------------------- ---------------- ----------------- ---------- ---------------- --- -------------------------------- ---------------
1 13276931100 2017-02-28 14:42:35 7 925702 ONLINE 839 NO /mnt/ramdisk/book/system01.dbf SYSTEM
2 13276931100 2017-02-28 14:42:35 1834 925702 ONLINE 828 NO /mnt/ramdisk/book/sysaux01.dbf SYSAUX
3 13276931100 2017-02-28 14:42:35 923328 925702 ONLINE 749 NO /mnt/ramdisk/book/undotbs01.dbf UNDOTBS1
4 13276931100 2017-02-28 14:42:35 16143 925702 ONLINE 834 NO /mnt/ramdisk/book/users01.dbf USERS
5 13276931100 2017-02-28 14:42:35 952916 925702 ONLINE 745 NO /mnt/ramdisk/book/example01.dbf EXAMPLE
6 13276931100 2017-02-28 14:42:35 13276257767 925702 ONLINE 213 YES /mnt/ramdisk/book/tea01.dbf TEA
6 rows selected.
--猜测正确. file#=6 FUZ=YES.
SYS@book> alter database open ;
alter database open
*
ERROR at line 1:
ORA-00600: internal error code, arguments: [3648], [6], [64], [], [], [], [], [], [], [], [], []
--猜测一下[6]估计指数据文件6.
--//修改回来.
BBED> set dba 6,1
DBA 0x01800001 (25165825 6,1)
BBED> assign kcvfhsta=0x0
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
ub2 kcvfhsta @138 0x0000 (NONE)
BBED> sum apply
Check value for File 6, Block 1:
current = 0x9386, required = 0x9386
SYS@book> select open_mode from v$database ;
OPEN_MODE
--------------------
MOUNTED
SYS@book> alter database open ;
Database altered.
