【故障处理】DG环境主库丢失归档情况下数据文件的恢复（4）
【故障处理】DG环境主库丢失归档情况下数据文件的恢复
BLOG文档结构图
2、 修复文件头的scn号
编译完成后可以使用BBED了：
SYS@oraLHRD1> set line 9999 pagesize 9999 SYS@oraLHRD1> col name format a80 SYS@oraLHRD1> select file#||' '||name||' '||bytes name from v$datafile where file#=64;
NAME -------------------------------------------------------------------------------- 64 +DATA1/oralhrs/datafile/tbs101.262.876578481 104857600 [ZFLHRSDB1:root]:/>su - grid [ZFLHRSDB1:grid]:/home/grid>asmcmd ASMCMD> cp +DATA1/oralhrs/datafile/tbs101.262.876578481 /tmp/a.dbf copying +DATA1/oralhrs/datafile/tbs101.262.876578481 -> /tmp/a.dbf ASMCMD> exit [ZFLHRSDB1:grid]:/home/grid>exit [ZFLHRSDB1:root]:/>su - oracle [ZFLHRSDB1:oracle]:/oracle>vi /tmp/file.txt [ZFLHRSDB1:oracle]:/oracle>cat /tmp/file.txt 1 /tmp/a.dbf [ZFLHRSDB1:oracle]:/oracle>bbed PASSWORD=blockedit mode=edit blocksize=8192 listfile=/tmp/file.txt BBED-00303: unable to open file '/tmp/a.dbf'
[ZFLHRSDB1:oracle]:/oracle>l /tmp/a.dbf -rw-r----- 1 grid dba 104865792 Sep 20 17:07 /tmp/a.dbf [ZFLHRSDB1:oracle]:/oracle>exit [ZFLHRSDB1:root]:/>chown oracle.dba /tmp/a.dbf [ZFLHRSDB1:root]:/>su - oracle [ZFLHRSDB1:oracle]:/oracle>bbed PASSWORD=blockedit mode=edit blocksize=8192 listfile=/tmp/file.txt BBED-00303: unable to open file 'log.bbd'
[ZFLHRSDB1:oracle]:/oracle>cd /tmp [ZFLHRSDB1:oracle]:/tmp>bbed PASSWORD=blockedit mode=edit blocksize=8192 listfile=/tmp/file.txt
BBED: Release 2.0.0.0.0 - Limited Production on Tue Sep 20 17:11:28 2016
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
************* !!! For Oracle Internal Use only !!! ***************
BBED> info File# Name Size(blks) ----- ---- ---------- 1 /tmp/a.dbf 0
BBED> show FILE# 1 BLOCK# 1 OFFSET 0 DBA 0x00400001 (4194305 1,1) FILENAME /tmp/a.dbf BIFILE bifile.bbd LISTFILE /tmp/file.txt BLOCKSIZE 8192 MODE Edit EDIT Unrecoverable IBASE Dec OBASE Dec WIDTH 80 COUNT 512 LOGFILE log.bbd SPOOL No
BBED> p kcvfhckp struct kcvfhckp, 160 bytes @484 struct kcvcpscn, 8 bytes @484 ====>>>>>kscnbas，这里是64号文件的当前SCN号，和之前查询来的是一致的，十进制为：1764555149 ub4 kscnbas @484 0x692cf98d ub2 kscnwrp @488 0x0000 ub4 kcvcptim @492 0x342e3478 ub2 kcvcpthr @496 0x0002 union u, 12 bytes @500 struct kcvcprba, 12 bytes @500 ====>>>>>kcrbaseq，这里是64号文件的当前日志号，468转换为十进制是1128 ub4 kcrbaseq @500 0x00000468 ub4 kcrbabno @504 0x0002c2fe ub2 kcrbabof @508 0x0010 ub1 kcvcpetb[0] @512 0x06 ub1 kcvcpetb[1] @513 0x00 ub1 kcvcpetb[2] @514 0x00
《《《《。。。。。。。。篇幅原因，有省略。。。。。。。。》》》》
====》数据文件的scn被记录在文件1号block偏移量484字节开始的四个字节中
BBED> d /v dba 1,1 offset 484 count 64 File: /tmp/a.dbf (1) Block: 1 Offsets: 484 to 547 Dba:0x00400001 ------------------------------------------------------- 692cf98d 00000000 342e3478 00020000 l i,......4.4x.... 00000468 0002c2fe 00100001 06000000 l ...h............ 00000000 00000000 00000000 00000000 l ................ 00000000 00000000 00000000 00000000 l ................
<16 bytes per line>
====》AIX下存储是正序，这个和linux正好相反 BBED> modify /x 3ab645ab3 dba 1,1 offset 484 BBED-00209: invalid number (3ab645ab3)
BBED> modify /x ab647c08 dba 1,1 offset 484 BBED-00209: invalid number (ab647c08) ====》484号不能直接修改，因为ab647c08是以字母开头，必须以数字开头，那么我们从483号开始修改 BBED> modify /x 00ab647c dba 1,1 offset 483 File: /tmp/a.dbf (1) Block: 1 Offsets: 483 to 546 Dba:0x00400001 ------------------------------------------------------------------------ 00ab647c 7b000300 00342e34 78000200 0000002b 4f0002c2 fe000000 10060000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
<32 bytes per line>
BBED> modify /x 08 dba 1,1 offset 487 File: /tmp/a.dbf (1) Block: 1 Offsets: 487 to 550 Dba:0x00400001 ------------------------------------------------------------------------ 08000300 00342e34 78000200 0000002b 4f0002c2 fe000000 10060000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
<32 bytes per line>
BBED> d /v dba 1,1 offset 484 count 64 File: /tmp/a.dbf (1) Block: 1 Offsets: 484 to 547 Dba:0x00400001 ------------------------------------------------------- ab647c08 00030000 342e3478 00020000 l .d|.....4.4x.... 00002b4f 0002c2fe 00000010 06000000 l ..+O............ 00000000 00000000 00000000 00000000 l ................ 00000000 00000000 00000000 00000000 l ................
<16 bytes per line>
BBED>
BBED> p kcvfhckp struct kcvfhckp, 160 bytes @484 struct kcvcpscn, 8 bytes @484 ub4 kscnbas @484 0xab647c08 ub2 kscnwrp @488 0x0003 ====>>>日志号过大，所以用到了kscnwrp ub4 kcvcptim @492 0x342e3478 ub2 kcvcpthr @496 0x0002 union u, 12 bytes @500 struct kcvcprba, 12 bytes @500 ub4 kcrbaseq @500 0x00002b4f ub4 kcrbabno @504 0x0002c2fe ub2 kcrbabof @508 0x0000 ub1 kcvcpetb[0] @512 0x06 ub1 kcvcpetb[1] @513 0x00
BBED> sum apply Check value for File 1, Block 1: current = 0xcb25, required = 0xcb25 |
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