磁盘故障导致以备份的system数据文件损坏
磁盘故障导致以备份的system数据文件损坏
SQL> select name from v$datafile;
NAME
--------------------------------------------------
/erikxue/system01.dbf
/erikxue/undotbs01.dbf
/erikxue/sysaux01.dbf
/erikxue/users01.dbf
/erikxue/mytbs01.dbf
SQL> alter tablespace system begin backup;
Tablespace altered.
SQL> ! cp /erikxue/system01.dbf /u01/oracle/
SQL> alter tablespace system end backup;
Tablespace altered.
SQL> ! ls /u01/oracle/
admin ctl_rw.sql oradata product tcl.sql
ctl_ro.sql flash_recovery_area oraInventory system01.dbf
update scott.emp set sal=sal+1;
commit;
alter system switch logfile;
重复上面 更新 提交 切换 产生5次交易 每次交易都在不同的日志中 模拟实际成产机效果
SQL> select name from v$datafile;
NAME
--------------------------------------------------
/erikxue/system01.dbf
/erikxue/undotbs01.dbf
/erikxue/sysaux01.dbf
/erikxue/users01.dbf
/erikxue/mytbs01.dbf
SQL> ! ls
1 1.txt afiedt.buf arc1 a.sh Desktop mystat2.sqlmystat.sql oratab
SQL> ! cp 1.txt /erikxue/system01.dbf
SQL> alter system switch logfile;
ERROR:
ORA-03114: not connected to ORACLE
alter system switch logfile
*
ERROR at line 1:
ORA-03113: end-of-file on communication channel
SQL>
系统崩溃 开始恢复
SQL> startup
ORACLE instance started.
Total System Global Area 285212672 bytes
Fixed Size 1218992 bytes
Variable Size 79693392 bytes
Database Buffers 201326592 bytes
Redo Buffers 2973696 bytes
Database mounted.
ORA-01157: cannot identify/lock data file 1 - see DBWR trace file
ORA-01110: data file 1: '/erikxue/system01.dbf'
SQL> select * from v$recover_file;
FILE# ONLINE ONLINE_ ERROR CHANGE# TIME
---------- ------- ------- ---------------------------------------- ---------- ---------
1 ONLINE ONLINE FILE NOT FOUND 0
SQL> ! ls -l /erikxue/system01.dbf
-rw-r----- 1 oracle oinstall 26 02-28 17:11 /erikxue/system01.dbf
SQL> select * from v$recovery_log;
no rows selected
取回备份
SQL> ! cp /u01/oracle/system01.dbf /erikxue/
SQL> select * from v$recover_file;
FILE# ONLINE ONLINE_ ERROR CHANGE# TIME
---------- ------- ------- ---------------------------------------- ---------- ---------
1 ONLINE ONLINE846670 28-FEB-11
SQL> select * from v$recovery_log;
恢复所需要使用的归档
THREAD# SEQUENCE# TIMEARCHIVE_NAME
---------- ---------- --------- ---------------------------------------------
1 61 28-FEB-11 /home/oracle/arc1/61_1_744004808.arc
1 62 28-FEB-11 /home/oracle/arc1/62_1_744004808.arc
1 63 28-FEB-11 /home/oracle/arc1/63_1_744004808.arc
SQL> recover datafile 1;
ORA-00279: change 846670 generated at 02/28/2011 17:02:37 needed for thread 1
ORA-00289: suggestion : /home/oracle/arc1/61_1_744004808.arc
ORA-00280: change 846670 for thread 1 is in sequence #61
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
<RET>=suggested 回车 系统自己去查找
filename 手动指明写日志或归档的文件位置
AUTO 系统自动去查找
cancel 取消恢复
ORA-00279: change 846737 generated at 02/28/2011 17:04:40 needed for thread 1
ORA-00289: suggestion : /home/oracle/arc1/62_1_744004808.arc
ORA-00280: change 846737 for thread 1 is in sequence #62
ORA-00278: log file '/home/oracle/arc1/61_1_744004808.arc' no longer needed for this recovery
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
ORA-00279: change 846742 generated at 02/28/2011 17:04:45 needed for thread 1
ORA-00289: suggestion : /home/oracle/arc1/63_1_744004808.arc
ORA-00280: change 846742 for thread 1 is in sequence #63
ORA-00278: log file '/home/oracle/arc1/62_1_744004808.arc' no longer needed for this recovery
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
auto
Log applied.
Media recovery complete.
SQL> alter database open;
Database altered.
SQL>