一,实验前的准备
数据库全备保证自己没成功还能补救一下
vim full.sh export ORACLE_BASE=/u01/app/oracle export ORACLE_HOME=$ORACLE_BASE/product/11.2/db_1 export ORACLE_SID=proc export NLS_LANG=AMERICAN_AMERICA.ZHS16GBK export PATH=$ORACLE_HOME/bin:$PATH rman target / log /u01/backup/rman_full.log append<<EOF run {allocate channel c1 type disk; allocate channel c2 type disk; backup database filesperset 4 format '/u01/backup/full_%d_%T_%s_%p'; sql 'alter system archive log current'; sql 'alter system archive log current'; sql 'alter system archive log current'; backup archivelog all format '/u01/backup/arch_%d_%T_%s_%p' delete input; backup current controlfile format '/u01/backup/ctl_%d_%T_%s_%p'; crosscheck backup; crosscheck archivelog all; delete noprompt obsolete; delete noprompt expired backup; delete noprompt expired archivelog all; } EOF
查看日志组的状态
size_MB,members,archived,status,first_change#,to_char(FIRST_TIME,'yyyy-mm-dd hh24:mi:ss') first_time from v$log;
日志文件位置
SELECT group#,member FROM v$logfile;
记录下来: 开始破坏
第一步,关闭数据库
第二步,删除或者移动一个rodo日志.
二,恢复
启动数据库报错
发现启动到mount状态后开始报错了
报错说的还不怎么详细.我们深入看一下
show parameter background_dump
进入报错日志里面查看--报错日志为第一个log文件...
查看最近的报错信息
可以看见日志文件redo3找不到了
查看日志状态:
哇,不行.
现在关闭数据库
也报错了
强制关闭
shutdown abort
启动数据库到mount状态
查看日志状态:
有一个日志文件报错了
1 select a.group#,a.thread#,b.member,a.bytes/1024/1024 2 size_MB,a.members,a.archived,a.status from v$log a,v$logfile b where a.group#=b.group#;
处理文件:
alter database clear logfile group 3;
开启数据库:
没有报错了
假如日志成员全部删除了也是这样恢复的
全部删除了,
启动报错
按照上文恢复
好像并不能关闭了----
1 SQL> startup mount 2 ORACLE instance started. 3 4 Total System Global Area 1803841536 bytes 5 Fixed Size 2254144 bytes 6 Variable Size 1577061056 bytes 7 Database Buffers 218103808 bytes 8 Redo Buffers 6422528 bytes 9 Database mounted. 10 SQL> select group#,thread#,sequence#,bytes/1024/1024 11 size_MB,members,archived,status,first_change#,to_char(FIRST_TIME,'yyyy-mm-dd hh24:mi:ss') first_time from v$log; 12 2 13 GROUP# THREAD# SEQUENCE# SIZE_MB MEMBERS ARC STATUS 14 ---------- ---------- ---------- ---------- ---------- --- ---------------- 15 FIRST_CHANGE# FIRST_TIME 16 ------------- ------------------- 17 1 1 10749 512 1 NO CURRENT 18 39958366 2019-02-27 17:17:59 19 20 3 1 0 512 1 YES UNUSED 21 39938038 2019-02-27 16:47:59 22 23 2 1 10747 512 1 YES INACTIVE 24 39938029 2019-02-27 16:47:59 25 26 27 SQL> alter database clear logfile group 3;^H^H^H^H^H^H 28 2 29 SQL> s^H^H 30 SP2-0042: unknown command " - rest of line ignored. 31 SQL> 32 SQL> 33 SQL> 34 SQL> alter database open; 35 alter database open 36 * 37 ERROR at line 1: 38 ORA-03113: end-of-file on communication channel 39 Process ID: 3292 40 Session ID: 1705 Serial number: 5 41 42 43 SQL> alter database clear logfile group 3; 44 ERROR: 45 ORA-03114: not connected to ORACLE 46 47 48 SQL> exit 49 Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production 50 With the Partitioning, OLAP, Data Mining and Real Application Testing options 51 [oracle@dataknown prod]$ sqlplus / as sysdba 52 53 SQL*Plus: Release 11.2.0.4.0 Production on Wed Feb 27 17:51:40 2019 54 55 Copyright (c) 1982, 2013, Oracle. All rights reserved. 56 57 Connected to an idle instance. 58 59 SQL> startup mount 60 ORACLE instance started. 61 62 Total System Global Area 1803841536 bytes 63 Fixed Size 2254144 bytes 64 Variable Size 1577061056 bytes 65 Database Buffers 218103808 bytes 66 Redo Buffers 6422528 bytes 67 Database mounted. 68 SQL> alter database clear logfile group 3; 69 70 Database altered. 71 72 SQL> alter database open; 73 74 Database altered. 75 76 SQL>
插入发现以下报错的可以参考参考
1 SQL> alter database clear logfile group 3; 2 alter database clear logfile group 3 3 * 4 ERROR at line 1: 5 ORA-00350: log 3 of instance prod (thread 1) needs to be archived 6 ORA-00312: online log 3 thread 1: '/data/oradata/prod/redo03.log'
执行以下命令:
alter database clear unarchived logfile group 3;
然后在打开数据库