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月归档:十一月 2017
asm磁盘组操作不当导致数据文件丢失恢复
最近遇到数据库恢复case,客户是要更换存储,在数据库mount状态把使用omf方式存储数据的asm 磁盘组通过rman copy到新的通过别名方式存储的新的asm 磁盘组的存储中,但是由于操作人员粗心,copy语句中部分目标磁盘组的数据文件别名重复了,最后执行rename file之后,导致部分数据文件彻底丢失.我们通过底层碎片扫描(参考:asm disk header 彻底损坏恢复)对于该用户的数据实现完全恢复.
因为整个过程重现比较麻烦,这里测试从一个data磁盘组中有一个omf方式存储的含有两个数据文件的表空间,通过rman copy 把这个表空间的两个文件拷贝到datanew磁盘组中,但是由于粗心把两个数据文件的别名写成一样,结果导致该表空间的一个数据文件彻底丢失的测试.
创建测试表空间
在datanew磁盘组中创建omf方式管理的xifenfei表空间,含有两个数据文件,file#分别为14和15
SQL> create tablespace xifenfei datafile '+DATA' SIZE 128m; Tablespace created. SQL> ALTER TABLESPACE XIFENFEI ADD DATAFILE '+DATA' SIZE 128m AUTOEXTEND ON; Tablespace altered. SQL> SELECT FILE_NAME,FILE_ID FROM DBA_DATA_FILES WHERE TABLESPACE_NAME='XIFENFEI'; FILE_NAME -------------------------------------------------------------------------------- FILE_ID ---------- +DATA/XFF/DATAFILE/xifenfei.276.961143809 14 +DATA/XFF/DATAFILE/xifenfei.277.961143825 15
rman copy datafile 14
通过rman copy把datafile 14拷贝到data磁盘组中,目标端为别名方式存储
RMAN> copy datafile 14 to '+datanew/xifenfei.dbf'; Starting backup at 27-NOV-17 using target database control file instead of recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=24 device type=DISK channel ORA_DISK_1: starting datafile copy input datafile file number=00014 name=+DATA/XFF/DATAFILE/xifenfei.276.961143809 output file name=+DATANEW/xifenfei.dbf tag=TAG20171127T082643 RECID=4 STAMP=961144006 channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07 Finished backup at 27-NOV-17 [grid@localhost ~]$ asmcmd ASMCMD> cd datanew ASMCMD> ls XFF/ xifenfei.dbf ASMCMD> ls -l Type Redund Striped Time Sys Name Y XFF/ DATAFILE UNPROT COARSE NOV 27 08:00:00 N xifenfei.dbf => +DATANEW/XFF/DATAFILE/XIFENFEI.256.961144003 ASMCMD>
这里通过asmcmd的ls命令,可以看到虽然我们存储的为datanew磁盘组的别名文件,实际上是link到asm的omf方式的文件(本质上asm中的文件都是omf方式存储,只是在使用的时候体现asm的客户端程序方式不一样,是直接asm中的omf方式,还是asm中的别名).
rman copy datafile 15
通过rman copy把datafile 15 拷贝到和datafile 14别名一样的文件了
RMAN> copy datafile 15 to '+datanew/xifenfei.dbf'; Starting backup at 27-NOV-17 using channel ORA_DISK_1 channel ORA_DISK_1: starting datafile copy input datafile file number=00015 name=+DATA/XFF/DATAFILE/xifenfei.277.961143825 output file name=+DATANEW/xifenfei.dbf tag=TAG20171127T082731 RECID=5 STAMP=961144053 channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:03 Finished backup at 27-NOV-17 ASMCMD> ls -l Type Redund Striped Time Sys Name Y XFF/ DATAFILE UNPROT COARSE NOV 27 08:00:00 N xifenfei.dbf => +DATANEW/XFF/DATAFILE/XIFENFEI.256.961144003 ASMCMD> cd xff ASMCMD> ls DATAFILE/ ASMCMD> cd datafile ASMCMD> ls XIFENFEI.256.961144003 ASMCMD>
这里可以看出来,在data磁盘组中,file 14被file 15覆盖掉了
rename file
把data磁盘组中的数据文件rename 到datanew磁盘组中
SQL> alter database rename file '+DATA/XFF/DATAFILE/xifenfei.276.961143809' to '+datanew/xifenfei.dbf'; Database altered. SQL> alter database rename file '+DATA/XFF/DATAFILE/xifenfei.277.961143825' to '+datanew/xifenfei.dbf'; alter database rename file '+DATA/XFF/DATAFILE/xifenfei.277.961143825' to '+datanew/xifenfei.dbf' * ERROR at line 1: ORA-01511: error in renaming log/data files ORA-01523: cannot rename data file to '+data/xifenfei.dbf' - file already part of database
这里我们可以看到,file 14 rename 成功,但是file 15 rename失败,因为在数据库中,已经有了别名的文件(数据文件的路径)
omf自动删除文件
查看原磁盘组datanew中,发现datafile 14被自动删除
ASMCMD> pwd +DATA/XFF/DATAFILE ASMCMD> ls -l Type Redund Striped Time Sys Name DATAFILE UNPROT COARSE NOV 27 08:00:00 Y SYSAUX.257.942061433 DATAFILE UNPROT COARSE NOV 27 08:00:00 Y SYSTEM.256.942061393 DATAFILE UNPROT COARSE NOV 27 08:00:00 Y UNDOTBS1.258.942061449 DATAFILE UNPROT COARSE NOV 27 08:00:00 Y USERS.259.942061449 DATAFILE UNPROT COARSE NOV 27 08:00:00 Y XIFENFEI.277.961143825 ASMCMD>
alert日志证实数据文件被删除
2017-11-27T09:05:03.054741-05:00 alter database rename file '+DATA/XFF/DATAFILE/xifenfei.276.961143809' to '+datanew/xifenfei.dbf' 2017-11-27T09:05:03.114947-05:00 NOTE: Under CF enqueue, no dependency request for disk group DATANEW Deleted Oracle managed file +DATA/XFF/DATAFILE/xifenfei.276.961143809 Completed: alter database rename file '+DATA/XFF/DATAFILE/xifenfei.276.961143809' to '+datanew/xifenfei.dbf' 2017-11-27T09:05:21.471474-05:00 alter database rename file '+DATA/XFF/DATAFILE/xifenfei.277.961143825' to '+data/xifenfei.dbf' ORA-1511 signalled during:alter database rename file '+DATA/XFF/DATAFILE/xifenfei.277.961143825' to'+datanew/xifenfei.dbf'
这里可以证实,数据文件的omf方式管理,在数据文件执行rename file的时候,会自动删除掉老的数据文件.这里悲剧已经发生,由于rman copy 覆盖了datanew磁盘组中的datafile 14,rename file又导致data磁盘组中的datafile 14被自动删除,从而使得datafile 14这个数据文件在两个磁盘组中都丢失.从常规角度来说,如果没有合适的备份该文件无法恢复.如果遭遇到oracle asm中数据文件丢失或者部分覆盖,请保护现场,联系我们(ORACLE数据库恢复技术支持),将为您提供专业数据库技术支持:Phone:17813235971 Q Q:107644445 E-Mail:dba@xifenfei.com最大限度抢救您的数据
dbconsole和sysman用户
dbconsole一直是我不怎么推荐的oracle工具,但是总有一些客户使用,这里对于dbconsole中sysman用户状态,密码修改做了一些基本的测试
sysman用户被锁
SQL> alter user sysman account lock; User altered.
重启dbconsole
[oracle@localhost ~]$ emctl stop dbconsole perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "c" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). Oracle Enterprise Manager 11g Database Control Release 11.2.0.4.0 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved. https://localhost:1158/em/console/aboutApplication Stopping Oracle Enterprise Manager 11g Database Control ... ... Stopped. [oracle@localhost ~]$ emctl start dbconsole perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "c" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). Oracle Enterprise Manager 11g Database Control Release 11.2.0.4.0 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved. https://localhost:1158/em/console/aboutApplication Starting Oracle Enterprise Manager 11g Database Control ..... started. ------------------------------------------------------------------ Logs are generated in directory /u01/app/oracle/product/11.2.0/db_1/localhost_test/sysman/log
部分错误日志提示(这里可以明显dbconsole无法正常使用是由于sysman被锁)
解锁sysman用户
SQL> alter user sysman account unlock; User altered.
重启dbconsole
[oracle@localhost ~]$ emctl stop dbconsole perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "c" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). Oracle Enterprise Manager 11g Database Control Release 11.2.0.4.0 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved. https://localhost:1158/em/console/aboutApplication Stopping Oracle Enterprise Manager 11g Database Control ... ... Stopped. [oracle@localhost ~]$ emctl start dbconsole perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "c" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). Oracle Enterprise Manager 11g Database Control Release 11.2.0.4.0 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved. https://localhost:1158/em/console/aboutApplication Starting Oracle Enterprise Manager 11g Database Control ..... started. ------------------------------------------------------------------ Logs are generated in directory /u01/app/oracle/product/11.2.0/db_1/localhost_test/sysman/log
sysman解锁之后重启dbconsole恢复正常
修改sysman密码
SQL> alter user sysman identified by xifenfei; User altered. SQL> select account_status from dba_users where username='SYSMAN'; ACCOUNT_STATUS -------------------------------- OPEN
重启dbconsole
[oracle@localhost ~]$ emctl stop dbconsole perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "c" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). Oracle Enterprise Manager 11g Database Control Release 11.2.0.4.0 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved. https://localhost:1158/em/console/aboutApplication Stopping Oracle Enterprise Manager 11g Database Control ... ... Stopped. [oracle@localhost ~]$ emctl start dbconsole perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "c" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). Oracle Enterprise Manager 11g Database Control Release 11.2.0.4.0 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved. https://localhost:1158/em/console/aboutApplication Starting Oracle Enterprise Manager 11g Database Control ..... started. ------------------------------------------------------------------ Logs are generated in directory /u01/app/oracle/product/11.2.0/db_1/localhost_test/sysman/log
SQL> select account_status from dba_users where username='SYSMAN'; ACCOUNT_STATUS -------------------------------- LOCKED(TIMED)
由于dbconsole的密码存储在配置文件中,修改sysman密码,而配置文件的没有修改,因此使用错误是syman密码登录,超过了profile里面设置的10次,导致用户被锁.
解决sysman密码不对导致异常问题
[oracle@localhost ~]$ emctl stop dbconsole perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "c" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). Oracle Enterprise Manager 11g Database Control Release 11.2.0.4.0 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved. https://localhost:1158/em/console/aboutApplication Stopping Oracle Enterprise Manager 11g Database Control ... ... Stopped. [oracle@localhost config]$ pwd /u01/app/oracle/product/11.2.0/db_1/localhost_test/sysman/config [oracle@localhost config]$ ls -l emoms.properties -rw-r--r--. 1 oracle oinstall 1669 Nov 25 15:20 emoms.properties [oracle@localhost config]$ grep emdRepPwd emoms.properties|grep -v emdRepPwdSeed oracle.sysman.eml.mntr.emdRepPwd=e3299b5db6162f5d oracle.sysman.eml.mntr.emdRepPwdEncrypted=TRUE [oracle@localhost config]$ grep emdRepPwd emoms.properties|grep -v emdRepPwdSeed oracle.sysman.eml.mntr.emdRepPwd=xifenfei oracle.sysman.eml.mntr.emdRepPwdEncrypted=FALSE
SQL> alter user sysman account unlock; User altered.
[oracle@localhost ~]$ emctl start dbconsole perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "c" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). Oracle Enterprise Manager 11g Database Control Release 11.2.0.4.0 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved. https://localhost:1158/em/console/aboutApplication Starting Oracle Enterprise Manager 11g Database Control ..... started. ------------------------------------------------------------------ Logs are generated in directory /u01/app/oracle/product/11.2.0/db_1/localhost_test/sysman/log
通过人工修改$ORACLE_HOME/localhost_sid/sysman/config/emoms.properties文件中的oracle.sysman.eml.mntr.emdRepPwd=密码,oracle.sysman.eml.mntr.emdRepPwdEncrypted=false实现修改密码
[oracle@localhost config]$ grep emdRepPwd emoms.properties|grep -v emdRepPwdSeed oracle.sysman.eml.mntr.emdRepPwd=aa537afcbab41e05 oracle.sysman.eml.mntr.emdRepPwdEncrypted=TRUE
dbconsole重启之后,密码又重新被修改为加密方式,在11.2之前修改sysman密码,注意要同步修改emoms.properties中相关密码信息
sysman修改密码( 11.2 and higher)
[oracle@localhost config]$ emctl stop dbconsole perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "c" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). Oracle Enterprise Manager 11g Database Control Release 11.2.0.4.0 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved. https://localhost:1158/em/console/aboutApplication Stopping Oracle Enterprise Manager 11g Database Control ... ... Stopped.
SQL> alter user sysman identified by xifenfei123; User altered.
[oracle@localhost ~]$ emctl setpasswd dbconsole perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "c" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). Oracle Enterprise Manager 11g Database Control Release 11.2.0.4.0 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved. https://localhost:1158/em/console/aboutApplication Please enter new repository password: Repository password successfully updated. [oracle@localhost ~]$ emctl start dbconsole perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LANG = "c" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). Oracle Enterprise Manager 11g Database Control Release 11.2.0.4.0 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved. https://localhost:1158/em/console/aboutApplication Starting Oracle Enterprise Manager 11g Database Control ..... started. ------------------------------------------------------------------ Logs are generated in directory /u01/app/oracle/product/11.2.0/db_1/localhost_test/sysman/log
move lob导致index失效
在一次数据库升级过程中,因为blug需要move lob,导致表相关index失效,这里通过实验重现
数据库版本
SQL> select * from v$version; BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production PL/SQL Release 11.2.0.4.0 - Production CORE 11.2.0.4.0 Production TNS for Linux: Version 11.2.0.4.0 - Production NLSRTL Version 11.2.0.4.0 - Production
创建用户
SQL> create user xff identified by oracle; User created. SQL> grant dba to xff; Grant succeeded.
创建测试表和插入数据
SQL> conn xff/oracle Connected. SQL> create table t_xff (id int primary key not null,name varchar2(20),c_lob clob); Table created. SQL> insert into t_xff values(1,'www.xifenfei.com','//www.xifenfei.com'); 1 row created. SQL> insert into t_xff values(2,'www.xifenfei.com','//www.xifenfei.com'); 1 row created. SQL> commit; Commit complete. SQL> select index_name,status from user_indexes; INDEX_NAME STATUS ------------------------------ -------- SYS_IL0000090094C00003$$ VALID SYS_C0011148 VALID
move lob
SQL> ALTER TABLE t_xff MOVE LOB (c_lob) store as (tablespace users); Table altered. SQL> select index_name,status from user_indexes; INDEX_NAME STATUS ------------------------------ -------- SYS_IL0000090094C00003$$ VALID SYS_C0011148 UNUSABLE SQL> insert into t_xff values(3,'www.xifenfei.com','//www.xifenfei.com'); insert into t_xff values(3,'www.xifenfei.com','//www.xifenfei.com') * ERROR at line 1: ORA-01502: index 'XFF.SYS_C0011148' or partition of such index is in unusable state
这里很明显,当我们move lob之后,表的index变为无效,插入操作无法进行
rebuind index
SQL> alter index xff.SYS_C0011148 rebuild; Index altered. SQL> select index_name,status from user_indexes; INDEX_NAME STATUS ------------------------------ -------- SYS_IL0000090094C00003$$ VALID SYS_C0011148 VALID SQL> insert into t_xff values(3,'www.xifenfei.com','//www.xifenfei.com'); 1 row created. SQL> commit; Commit complete.
这个测试就是告诫自己,做oracle 不要想当然,move lob之后,表相关的index 都会失效,需要rebuild。具体参见:
Bug 6525073 : STBH: INDEX IS IN UNUSABLE STATE AFTER A LOB COLUMN IS MOVED
ALTER TABLE MOVE LOB makes indexes unusable on the parent table (Doc ID 1228324.1)