利用BBED恢复数据文件头
转载请注明出处：http://blog.csdn.net/guoyjoe/article/details/31018075 @@@@@@@利用BBED模拟损坏5文件1号块（文件头） BBED> copy file 4 block 4 to file 5 block 1
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 0 to 19 Dba:0x01400001
------------------------------------------------------------------------
1ea20000 04000001 1a4b0000 00000104 99810000 <32 bytes per line> sys@PROD> shutdown abort;
ORACLE instance shut down.
sys@PROD> starup
SP2-0042: unknown command "starup" - rest of line ignored.
sys@PROD> startup
ORACLE instance started.
Total System Global Area 939495424 bytes
Fixed Size 2233960 bytes
Variable Size 251660696 bytes
Database Buffers 679477248 bytes
Redo Buffers 6123520 bytes
Database mounted.
ORA-01122: database file 5 failed verification check
ORA-01110: data file 5: '/u01/app/oracle/oradata/PROD/tp01.dbf'
ORA-01210: data file header is media corrupt BBED开始恢复 1、找个文件头覆盖 BBED> copy file 4 block 1 to file 5 block 1
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 0 to 19 Dba:0x01400001
------------------------------------------------------------------------
0ba20000 01000001 00000000 00000104 edbc0000 <32 bytes per line> 2、进入5文件1号块
BBED> set file 5 block 1
FILE# 5
BLOCK# 1 （1）改块的地址5文件1号块，rdba_kcbh BBED> p kcvfhbfh
struct kcvfhbfh, 20 bytes @0
ub1 type_kcbh @0 0x0b
ub1 frmt_kcbh @1 0xa2
ub1 spare1_kcbh @2 0x00
ub1 spare2_kcbh @3 0x00
ub4 rdba_kcbh @4 0x01000001
ub4 bas_kcbh @8 0x00000000
ub2 wrp_kcbh @12 0x0000
ub1 seq_kcbh @14 0x01
ub1 flg_kcbh @15 0x04 (KCBHFCKV)
ub2 chkval_kcbh @16 0xbced
ub2 spare3_kcbh @18 0x0000 0x01000001===》0000 0001 0000==》100==》4号文件1号块
修改成5号1块 ===》0x01400001
BBED> d /v offset 4
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 4 to 23 Dba:0x01400001
-------------------------------------------------------
01000001 00000000 00000104 edbc0000 l ............í?..
00000000
BBED> m /x 01004001 offset 4
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 4 to 23 Dba:0x01400001
------------------------------------------------------------------------
01004001 00000000 00000104 edbc0000 00000000 (2)文件的大小kccfhfsz BBED> p kcvfhhdr
struct kcvfhhdr, 76 bytes @20
ub4 kccfhswv @20 0x00000000
ub4 kccfhcvn @24 0x0b200000
ub4 kccfhdbi @28 0x0f302c3e
text kccfhdbn[] @32 P
text kccfhdbn[] @33 R
text kccfhdbn[] @34 O
text kccfhdbn[] @35 D
text kccfhdbn[] @36
text kccfhdbn[] @37
text kccfhdbn[] @38
text kccfhdbn[] @39
ub4 kccfhcsq @40 0x00000d3d
ub4 kccfhfsz @44 0x00003200
s_blkz kccfhbsz @48 0x00
ub2 kccfhfno @52 0x0004
ub2 kccfhtyp @54 0x0003
ub4 kccfhacid @56 0x00000000
ub4 kccfhcks @60 0x00000000
text kccfhtag[] @64
....................
sys@PROD> select name from v$dbfile where file#=5; NAME
--------------------------------------------------
/u01/app/oracle/oradata/PROD/tp01.dbf [oracle@jfdb PROD]$ ls -lFtr |grep tp01
-rw-r-----. 1 oracle oinstall 524296192 Jun 8 18:58 tp01.dbf sys@PROD> select 524296192/8192 from dual; 524296192/8192
--------------
64001 注：0号块他是操作系头不为ORACLE所控制
64001-1=64000个块（10进制） 64000（10）==fa00(16)=====>bbed存储：00fa0000 BBED> d /v offset 44
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 44 to 63 Dba:0x01400001
-------------------------------------------------------
00320000 00200000 04000300 00000000 l .2... ..........
00000000
BBED> m /x 00fa0000 44
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 44 to 63 Dba:0x01400001
------------------------------------------------------------------------
00fa0000 00200000 04000300 00000000 00000000 (3)修改文件号（4--->5） ub2 kccfhfno @52 0x0004 BBED> d /v offset 52
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 52 to 71 Dba:0x01400001
-------------------------------------------------------
04000300 00000000 00000000 00000000 l ................
00000000 BBED> m /x 05 offset 52
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 52 to 71 Dba:0x01400001
------------------------------------------------------------------------
05000300 00000000 00000000 00000000 00000000 (4)修改文件创建时SCN BBED> p kcvfhcrs
struct kcvfhcrs, 8 bytes @100
ub4 kscnbas @100 0x00004b14
ub2 kscnwrp @104 0x0000 sys@PROD> select file#,CREATION_CHANGE# from v$datafile where file#=5; FILE# CREATION_CHANGE#
---------- ----------------
5 363921 sys@PROD> select to_char('','xxxxxxxxxxxxx') from dual; TO_CHAR('36392
--------------
58d91 ===（倒：918d0500）==》00058d91 BBED> d /v offset 100
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 100 to 119 Dba:0x01400001
-------------------------------------------------------
144b0000 00000000 30cf3e32 a41da532 l .K......0?>2¤.￥2
ec4f1900 BBED> m /x 918d offset 100
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 100 to 119 Dba:0x01400001
------------------------------------------------------------------------
918d0000 00000000 30cf3e32 a41da532 ec4f1900 BBED> m /x 0500 offset 102
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 102 to 121 Dba:0x01400001
------------------------------------------------------------------------
05000000 000030cf 3e32a41d a532ec4f 19000000 BBED> d /v offset 100
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 100 to 119 Dba:0x01400001
-------------------------------------------------------
918d0500 00000000 30cf3e32 a41da532 l ........0?>2¤.￥2
ec4f1900 (5)修改文件创建时间
ub4 kcvfhcrt @108 0x323ecf30
BBED> p kcvfhcrt
ub4 kcvfhcrt @108 0x323ecf30 sys@PROD> select file#,to_char(CREATION_TIME,'yyyy-mm-dd hh24:mi:ss') createTime,
2 (to_char(CREATION_TIME,'yyyy')-1988)*12*31*24*3600+
3 (to_char(CREATION_TIME,'mm')-1)*31*24*3600+
4 (to_char(CREATION_TIME,'dd')-1)*24*3600+
5 to_char(CREATION_TIME,'hh24')*3600+
6 to_char(CREATION_TIME,'mi')*60+
7 to_char(CREATION_TIME,'ss') createTimeSCN
8 from v$datafile WHERE file# in(4,5); FILE# CREATETIME CREATETIMESCN
---------- ------------------- -------------
4 2014-03-23 16:17:52 842977072
5 2014-03-29 10:32:22 843474742 sys@PROD> select '4' file#, to_char('842977072','xxxxxxxxxxxxxx') from dual; F TO_CHAR('842977
- ---------------
4 323ecf30 ===>倒：30cf3e32 sys@PROD> select '' file#,to_char('','xxxxxxxxxxxxxx') from dual; sys@PROD> select '' file#,to_char('','xxxxxxxxxxxxxx') from dual; F TO_CHAR('843474
- ---------------
5 32466736 ==》36674632 BBED> d /v offset 108
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 108 to 127 Dba:0x01400001
-------------------------------------------------------
30cf3e32 a41da532 ec4f1900 00000000 l 0?>2¤.￥2ìO......
d713a532 BBED> m /x 36674632 offset 108
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 108 to 127 Dba:0x01400001
------------------------------------------------------------------------
36674632 a41da532 ec4f1900 00000000 d713a532 (6)修改表空间号
sword kcvfhtsn @332 4 sys@PROD> select file#,TS# from v$datafile where file# in(4,5); FILE# TS#
---------- ----------
4 4
5 5 BBED> d /v offset 332
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 332 to 351 Dba:0x01400001
-------------------------------------------------------
04000000 05005553 45525300 00000000 l ......USERS.....
00000000 l .... <16 bytes per line> BBED> m /x 05 offset 332
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 332 to 351 Dba:0x01400001
------------------------------------------------------------------------
05000000 05005553 45525300 00000000 00000000 (7)修改相对文件号
ub4 kcvfhrfn @368 0x00000004 BBED> d /v offset 368
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 368 to 387 Dba:0x01400001
-------------------------------------------------------
04000000 00000000 00000000 00000000 l ................
00000000 l .... <16 bytes per line> BBED> m /x 05 offset 368
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 368 to 387 Dba:0x01400001
------------------------------------------------------------------------
05000000 00000000 00000000 00000000 00000000 (8)修改表空间的名称
BBED> p kcvfhtnm
text kcvfhtnm[0] @338 U
text kcvfhtnm[1] @339 S
text kcvfhtnm[2] @340 E
text kcvfhtnm[3] @341 R
text kcvfhtnm[4] @342 S
text kcvfhtnm[5] @343
text kcvfhtnm[6] @344
text kcvfhtnm[7] @345
text kcvfhtnm[8] @346
text kcvfhtnm[9] @347
text kcvfhtnm[10] @348
text kcvfhtnm[11] @349
text kcvfhtnm[12] @350 sys@PROD> select file#,TS# from v$datafile where file# in(4,5); FILE# TS#
---------- ----------
4 4
5 5 sys@PROD> select TS#,NAME from v$tablespace where ts# in(4,5); TS# NAME
---------- --------------------------------------------------
4 USERS
5 TP1 BBED> d /v offset 338
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 338 to 357 Dba:0x01400001
-------------------------------------------------------
55534552 53000000 00000000 00000000 l USERS...........
00000000 sys@PROD> select dump('USERS',16) from dual; DUMP('USERS',16)
----------------------------
Typ=96 Len=5: 55,53,45,52,53 sys@PROD> select dump('TP1',16) from dual; DUMP('TP1',16)
----------------------
Typ=96 Len=3: 54,50,31 BBED> m /x 54503100 offset 338
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 338 to 357 Dba:0x01400001
------------------------------------------------------------------------
54503100 53000000 00000000 00000000 00000000 <32 bytes per line> BBED> m /x 00 offset 342
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 342 to 361 Dba:0x01400001
------------------------------------------------------------------------
00000000 00000000 00000000 00000000 00000000 <32 bytes per line> BBED> d /v offset 338
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 338 to 357 Dba:0x01400001
-------------------------------------------------------
54503100 00000000 00000000 00000000 l TP1.............
00000000 (9)修改表空间的长度
ub2 kcvfhtln @336 0x0005 BBED> d /v offset 336
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 336 to 355 Dba:0x01400001
-------------------------------------------------------
05005450 31000000 00000000 00000000 l ..TP1...........
00000000 l .... <16 bytes per line> BBED> m /x 03 offset 336
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 336 to 355 Dba:0x01400001
------------------------------------------------------------------------
03005450 31000000 00000000 00000000 00000000 <32 bytes per line> (10)检查点 BBED> p kcvfhckp
struct kcvfhckp, 36 bytes @484
struct kcvcpscn, 8 bytes @484
ub4 kscnbas @484 0x0019b1a1 --->1683873
ub2 kscnwrp @488 0x0000
ub4 kcvcptim @492 0x32a59921 -->849713441
ub2 kcvcpthr @496 0x0001
union u, 12 bytes @500
struct kcvcprba, 12 bytes @500
ub4 kcrbaseq @500 0x00000002
ub4 kcrbabno @504 0x000002e0
ub2 kcrbabof @508 0x0010
ub1 kcvcpetb[0] @512 0x02
ub1 kcvcpetb[1] @513 0x00
ub1 kcvcpetb[2] @514 0x00
ub1 kcvcpetb[3] @515 0x00
ub1 kcvcpetb[4] @516 0x00
ub1 kcvcpetb[5] @517 0x00
ub1 kcvcpetb[6] @518 0x00
ub1 kcvcpetb[7] @519 0x00 sys@PROD> select file#,rfile#,CREATION_TIME,checkpoint_change#,unrecoverable_change#,offline_change# from v$datafile; FILE# RFILE# CREATION_ CHECKPOINT_CHANGE# UNRECOVERABLE_CHANGE# OFFLINE_CHANGE#
---------- ---------- --------- ------------------ --------------------- ---------------
1 1 23-MAR-14 1683873 0 1658859
2 2 23-MAR-14 1683873 0 1658859
3 3 23-MAR-14 1683873 0 1658859
4 4 23-MAR-14 1683873 0 1658859
5 5 29-MAR-14 1684251 0 1658859 sys@PROD> select to_number('19b1a1','xxxxxxxxxxxx') from dual; TO_NUMBER('19B1A1','XXXXXXXXXXXX')
----------------------------------
1683873
sys@PROD> select to_number('32a59921','xxxxxxxxxxxx') from dual; TO_NUMBER('32A59921','XXXXXXXXXXXX')
------------------------------------
849713441
sys@PROD> select file#,to_char(CHECKPOINT_TIME,'yyyy-mm-dd hh24:mi:ss') createTime,
2 (to_char(CHECKPOINT_TIME,'yyyy')-1988)*12*31*24*3600+
3 (to_char(CHECKPOINT_TIME,'mm')-1)*31*24*3600+
4 (to_char(CHECKPOINT_TIME,'dd')-1)*24*3600+
5 to_char(CHECKPOINT_TIME,'hh24')*3600+
6 to_char(CHECKPOINT_TIME,'mi')*60+
7 to_char(CHECKPOINT_TIME,'ss') createTimeSCN
8 from v$datafile WHERE file# in(4,5); FILE# CREATETIME CREATETIMESCN
---------- ------------------- -------------
4 2014-06-08 15:30:41 849713441
5 2014-06-08 15:38:33 849713913 sys@PROD> sys@PROD> select to_char('1684251','xxxxxxxxxxxxxxx') from dual; TO_CHAR('1684251
----------------
19b31b ====>真正5号文件的检查点SCN sys@PROD> select to_char('','xxxxxxxxxxxxxxx') from dual; TO_CHAR('8497139
----------------
32a59af9 ====>真正5号文件的检查点时间 ub4 kscnbas @484 0x0019b1a1 ====>真正5号文件的检查点SCN 19b31b (倒：1bb319)
ub4 kcvcptim @492 0x32a59921 ====>真正5号文件的检查点时间32a59af9（倒：f99aa532） BBED> d /v offset 484
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 484 to 503 Dba:0x01400001
-------------------------------------------------------
a1b11900 00000000 2199a532 01000000 l ?±......!.￥2....
02000000 BBED> m /x 1bb319 offset 484
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 484 to 503 Dba:0x01400001
------------------------------------------------------------------------
1bb31900 00000000 2199a532 01000000 02000000 BBED> d /v offset 492
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 492 to 511 Dba:0x01400001
-------------------------------------------------------
2199a532 01000000 02000000 e0020000 l !.￥2........à...
10007261 BBED> m /x f99a offset 492
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 492 to 511 Dba:0x01400001
------------------------------------------------------------------------
f99aa532 01000000 02000000 e0020000 10007261 ##################校验块
BBED> sum apply
Check value for File 5, Block 1:
current = 0x4a10, required = 0x4a10 BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/PROD/tp01.dbf
BLOCK = 1 DBVERIFY - Verification complete Total Blocks Examined : 1
Total Blocks Processed (Data) : 0
Total Blocks Failing (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing (Index): 0
Total Blocks Empty : 0
Total Blocks Marked Corrupt : 0
Total Blocks Influx : 0
Message 531 not found; product=RDBMS; facility=BBED ######################检查物理坏块 [oracle@jfdb PROD]$ dbv file=tp01.dbf start=1 end=2 DBVERIFY: Release 11.2.0.3.0 - Production on Sun Jun 8 21:48:37 2014 Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved. DBVERIFY - Verification starting : FILE = /u01/app/oracle/oradata/PROD/tp01.dbf DBVERIFY - Verification complete Total Pages Examined : 2
Total Pages Processed (Data) : 0
Total Pages Failing (Data) : 0
Total Pages Processed (Index): 0
Total Pages Failing (Index): 0
Total Pages Processed (Other): 2
Total Pages Processed (Seg) : 0
Total Pages Failing (Seg) : 0
Total Pages Empty : 0
Total Pages Marked Corrupt : 0
Total Pages Influx : 0
Total Pages Encrypted : 0
Highest block SCN : 1687542 (0.1687542) ############打开数据库报错 sys@PROD> shutdown abort;
ORACLE instance shut down.
sys@PROD> startup
ORACLE instance started. Total System Global Area 939495424 bytes
Fixed Size 2233960 bytes
Variable Size 251660696 bytes
Database Buffers 679477248 bytes
Redo Buffers 6123520 bytes
Database mounted.
ORA-01122: database file 5 failed verification check
ORA-01110: data file 5: '/u01/app/oracle/oradata/PROD/tp01.dbf'
ORA-01207: file is more recent than control file - old control file ###########怀疑检查点计数器，这里我先用BBED（方法1重建控制文件，方法2利用BBED修改计算器） ub4 kcvfhcpc @140 0x00000102
ub4 kcvfhccc @148 0x00000101 idle> alter session set events 'immediate trace name controlf level 8'; Session altered. DATA FILE #5:
name #4: /u01/app/oracle/oradata/PROD/tp01.dbf
creation size=0 block size=8192 status=0xe head=4 tail=4 dup=1
tablespace 5, index=5 krfil=5 prev_file=0
unrecoverable scn: 0x0000.00000000 01/01/1988 00:00:00
Checkpoint cnt:226 scn: 0x0000.0019b31b 06/08/2014 15:38:33
Stop scn: 0xffff.ffffffff 06/08/2014 07:44:07
Creation Checkpointed at scn: 0x0000.00058d91 03/29/2014 10:32:22
thread:0 rba:(0x0.0.0) sys@PROD> select to_char('226','xxxxxxxxxxxxx') from dual; TO_CHAR('226',
--------------
e2 sys@PROD> select to_char('225','xxxxxxxxxxxxx') from dual; TO_CHAR('225',
--------------
e1 BBED> d /v offset 140
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 140 to 159 Dba:0x01400001
-------------------------------------------------------
02010000 8bc6a532 01010000 b24f1900 l .....?￥2....2O..
00000000 BBED> m /x e200 offset 140
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 140 to 159 Dba:0x01400001
------------------------------------------------------------------------
e2000000 8bc6a532 01010000 b24f1900 00000000 <32 bytes per line> BBED> d /v offset 148
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 148 to 167 Dba:0x01400001
-------------------------------------------------------
01010000 b24f1900 00000000 d713a532 l ....2O......×.￥2
01000000 l .... <16 bytes per line> BBED> m /x e100 offset 148
File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
Block: 1 Offsets: 148 to 167 Dba:0x01400001
------------------------------------------------------------------------
e1000000 b24f1900 00000000 d713a532 01000000 <32 bytes per line> BBED> sum apply
Check value for File 5, Block 1:
current = 0x4a10, required = 0x4a10 BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/PROD/tp01.dbf
BLOCK = 1 DBVERIFY - Verification complete Total Blocks Examined : 1
Total Blocks Processed (Data) : 0
Total Blocks Failing (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing (Index): 0
Total Blocks Empty : 0
Total Blocks Marked Corrupt : 0
Total Blocks Influx : 0
Message 531 not found; product=RDBMS; facility=BBED ##########再次打开库，OK! sys@PROD> select status from v$instance;
STATUS
------------
MOUNTED sys@PROD> alter database open; Database altered. ###############################修改数据文件头的注意点：
1、修改数据的DBA,rdba_kcbh 2、修改文件的大小，kccfhfsz 3、修改文件号，kccfhfno 4、修改文件创建时SCN，kcvfhcrs 5、修改文件创建时间，kcvfhcrt 6、修改表空间号，kcvfhtsn 7、修改相对文件号，kcvfhrfn 8、修改表空间的名称， kcvfhtnm 9、修改表空间的长度，kcvfhtln 10、修改检查点的SCN，kcvfhckp 11、修改检查点的时间，kcvcptim 12、修改检查点的计数器，kcvfhcpc 13、修改检查点的控制文件备份的计数器， kcvfhccc 14、如果你修改是1号文件的1号块他的root rdba的地针是指向了bootstrap$
---------------------
作者：郭一军_guoyJoe
来源：CSDN
原文：https://blog.csdn.net/guoyjoe/article/details/31018075
版权声明：本文为博主原创文章，转载请附上博文链接！
利用BBED恢复数据文件头的更多相关文章
- 使用BBED恢复数据文件头
转载请注明出处:http://blog.csdn.net/guoyjoe/article/details/31018075 @@@@@@@利用BBED模拟损坏5文件1号块(文件头) BBED> ...
- 使用dd备份和恢复ASM中的数据文件头
这里用大家随处可见的(除了extent分布的x$kffxp需要百度和google外),其余都是文档中有详细记载的常用ASM视图来实现同样功能: 下面的用于从ASM中备份数据文件头: SQL> s ...
- 04 bbed修复system文件头损坏
04 bbed修复system文件头损坏 1 启动数据库,查看trace,在mount到open, SQL> startup mount; ORACLE instance started. To ...
- 利用BBED恢复UPDATE改动前的值
转载请注明出处:http://blog.csdn.net/guoyjoe/article/details/30615151 实验步骤例如以下: 1.创建表guo_test1 gyj@PROD> ...
- mysql利用binlog恢复数据
需求:需要给开发提供一个2018年9月30号的数据,按照我们公司正常备份策略来说,直接找到对应时间的备份数据,解压导入即可,恰好这个时间节点的数据没有,只备份到2018年9月25号的,糟糕了吧 咋办呢 ...
- mysql利用binlog恢复数据详细例子
模拟数据恢复的案例 有些时候脑瓜就会短路,难免会出错 场景:在生产环境中,我们搭建了mysql主从,备份操作都是在从备份数据库上 前提:有最近一天或者最近的全备 或者最近一天相关数据库的备份 最重要的 ...
- 05 使用bbed跳过归档恢复数据文件
5 使用BBED跳过归档 在归档模式下,缺失了一部分的归档日志文件,对数据文件进行恢复 1 开启归档 --shutdown immediate --startup mount --alter data ...
- 不小心删除数据--利用MySQL的binlog恢复数据
MySQL Binary Log也就是常说的bin-log, ,是mysql执行改动产生的二进制日志文件,其主要作用有两个: * 数据回复 * 主从数据库.用于slave端执行增删改,保持与maste ...
- 利用mysql的binlog恢复数据
MySQL Binary Log也就是常说的bin-log, ,是mysql执行改动产生的二进制日志文件,其主要作用有两个: * 数据回复 * 主从数据库.用于slave端执行增删改,保持与maste ...
随机推荐
- blfs（systemd版本）学习笔记-构建ibus-libpinyin使用中文输入法
我的邮箱地址:zytrenren@163.com欢迎大家交流学习纠错! 一.包的下载地址 1.libpinyin 下载地址:http://deb.debian.org/debian/pool/main ...
- 洛谷P4768 [NOI2018]归程(Kruskal重构树)
题意 直接看题目吧,不好描述 Sol 考虑暴力做法 首先预处理出从$1$到每个节点的最短路, 对于每次询问,暴力的从这个点BFS,从能走到的点里面取$min$ 考虑如何优化,这里要用到Kruskal重 ...
- smarty模板基础----缓存数据
缓存数据,这个并不是暂存的缓存,而是写入了内存的缓存 通过一个例子来书写:缓存数据 一.书写php和html页面的基本功能 既然是用smarty模板,那么前端和后端要分开写了 (1)php页面 1 2 ...
- RPC理论以及Dubbo的使用介绍
RPC 的主要功能目标是让构建分布式应用更容易,在提供强大的远程调用能力时不损失本地调用的语义简洁性. 为实现该目标,RPC 框架需提供一种透明调用机制让使用者不必显式的区分本地调用和远程调用. RP ...
- Scrollview嵌套Recyclerview嵌套滑动冲突，导致滑动时会出现卡顿的现象
recyclerView.setLayoutManager(new GridLayoutManager(mContext,2){ @Override public boolean canScrollV ...
- AlexNet卷积神经网络【前向反馈】
1.代码实现 # -*- coding: utf-8 -*- """ Created on Wed Nov 14 17:13:05 2018 @author: zhen ...
- [20190328]简单探究sql语句相关mutexes.txt
[20190328]简单探究sql语句相关mutexes.txt --//摘要:http://www.askmaclean.com/archives/understanding-oracle-mute ...
- web前端（8）—— CSS选择器
选择器 选择器,说白了就是html的标签或者其相关特性,在一个HTML页面中会有很多很多的元素,不同的元素可能会有不同的样式,某些元素又需要设置相同的样式,选择器就是用来从HTML页面中查找特定元素的 ...
- xpath语法大全
XPath 节点 XPath 术语 节点 在 XPath 中,有七种类型的节点:元素.属性.文本.命名空间.处理指令.注释以及文档(根)节点.XML 文档是被作为节点树来对待的.树的根被称为文档节点或 ...
- C#计算时间差 TimeSpan
TimeSpan的相关属性 Add:与另一个TimeSpan值相加. Days:返回用天数计算的TimeSpan值. Duration:获取TimeSpan的绝对值. Hours:返回用小时计算的Ti ...