(Les16 执行数据库恢复)-重作日志文件恢复
丢失重作日志文件
丢失了重作日志文件组中的某个成员，而且组中至少还有一个成员：
-不会影响实例的正常操做。
-预警日志中会收到一条信息，通知您没法找到某个成员
-能够经过删除丢失的重作日志成员并添加新成员来恢复丢失的日志文件
-若是包含丢失日志文件的组已归档，您能够清除日志组来从新建立丢失的文件
恢复步骤：1.肯定是否有缺失的日志文件2.恢复丢失的文件时，先删除丢失的重作日志成员ALTER DATABASE DROP LOGFILE MEMBER '+DATA/orcl/onlinelog/group_1.261.691672257';3.而后添加新成员来替代丢失的日志成员ALTER DATABASE ADD LOGFILE MEMBER '+DATA' TO GROUP 2;4.若是介质故障是因为磁盘或控制器缺失而形成的，需重命名丢失文件。5.若是重作日志组已归档，或者处于NOARCHIVELOG模式下，则可选择在清除日志组后从新建立缺失来解决问题，ALTER DATABASE CLEAR LOGFILE GROUP n;注意：清除未归档的日志组，应当即对整个数据库执行彻底备份，不然，在发生其它故障的状况下，会致使数据丢失。ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP #;
测试环境中先新增3组，每组2个成员
alter database add logfile group 4 ('/u01/app/oracle/oradata/xiocpt0/p_redo04_01.log','/u01/app/oracle/oradata/xiocpt0/p_redo04_02.log') size 128M; alter database add logfile group 5 ('/u01/app/oracle/oradata/xiocpt0/p_redo05_01.log','/u01/app/oracle/oradata/xiocpt0/p_redo05_02.log') size 128M; alter database add logfile group 6 ('/u01/app/oracle/oradata/xiocpt0/p_redo06_01.log','/u01/app/oracle/oradata/xiocpt0/p_redo06_02.log') size 128M;
set pagesize 600
select group#,sequence#,bytes/(1024*1024),members,archived,status from v$log;
col member format a50
select group#,status,member from v$logfile;
SQL> set pagesize 600 select group#,sequence#,bytes/(1024*1024),members,archived,status from v$log;--查看重作日志成员状态信息 col member format a50 SQL> SQL> GROUP# SEQUENCE# BYTES/(1024*1024) MEMBERS ARC STATUS ---------- ---------- ----------------- ---------- --- ---------------- 1 4 50 1 YES INACTIVE 2 5 50 1 NO CURRENT 3 3 50 1 YES INACTIVE 4 0 128 2 YES UNUSED 5 0 128 2 YES UNUSED 6 0 128 2 YES UNUSED 6 rows selected. SQL> select group#,status,member from v$logfile;--查看重作日志成员，物理路径，这里存储方式为文件系统 GROUP# STATUS MEMBER ---------- ------- -------------------------------------------------- 1 STALE /u01/app/oracle/oradata/xiocpt0/redo01.log 3 STALE /u01/app/oracle/oradata/xiocpt0/redo03.log 2 /u01/app/oracle/oradata/xiocpt0/redo02.log 4 /u01/app/oracle/oradata/xiocpt0/p_redo04_01.log 4 /u01/app/oracle/oradata/xiocpt0/p_redo04_02.log 5 /u01/app/oracle/oradata/xiocpt0/p_redo05_01.log 5 /u01/app/oracle/oradata/xiocpt0/p_redo05_02.log 6 /u01/app/oracle/oradata/xiocpt0/p_redo06_01.log 6 /u01/app/oracle/oradata/xiocpt0/p_redo06_02.log 9 rows selected. 手动删除group 1的物理文件 SQL> !rm /u01/app/oracle/oradata/xiocpt0/redo01.log group 1的状态以归档，INACTIVE SQL> select group#,sequence#,bytes/(1024*1024),members,archived,status from v$log; GROUP# SEQUENCE# BYTES/(1024*1024) MEMBERS ARC STATUS ---------- ---------- ----------------- ---------- --- ---------------- 1 4 50 1 YES INACTIVE 2 5 50 1 NO CURRENT 3 3 50 1 YES INACTIVE 4 0 128 2 YES UNUSED 5 0 128 2 YES UNUSED 6 0 128 2 YES UNUSED 6 rows selected. 验证物理文件已被删除 SQL> !ls -l /u01/app/oracle/oradata/xiocpt0/redo01.log ls: cannot access /u01/app/oracle/oradata/xiocpt0/redo01.log: No such file or directory 针对已归档的重作日志文件组，可使用clear命令进行恢复 alter database clear logfile group 1; SQL> alter database clear logfile group 1; Database altered. 验证物理文件已恢复完成 SQL> !ls -l /u01/app/oracle/oradata/xiocpt0/redo01.log -rw-r----- 1 oracle dba 52429312 May 22 13:42 /u01/app/oracle/oradata/xiocpt0/redo01.log
切换重作日志文件
alter system switch logfile;
alter system checkpoint;
测试删除重作日志文件组中单个成员
SQL> select group#,sequence#,bytes/(1024*1024),members,archived,status from v$log; GROUP# SEQUENCE# BYTES/(1024*1024) MEMBERS ARC STATUS ---------- ---------- ----------------- ---------- --- ---------------- 1 6 50 1 YES INACTIVE 2 5 50 1 YES INACTIVE 3 3 50 1 YES INACTIVE 4 7 128 2 YES INACTIVE 5 8 128 2 YES INACTIVE 6 9 128 2 NO CURRENT 删除group 5中的 02成员 SQL> !ls -l /u01/app/oracle/oradata/xiocpt0/p_redo05_02.log -rw-r----- 1 oracle dba 134218240 May 22 13:42 /u01/app/oracle/oradata/xiocpt0/p_redo05_02.log SQL> !rm /u01/app/oracle/oradata/xiocpt0/p_redo05_02.log SQL> !ls -l /u01/app/oracle/oradata/xiocpt0/p_redo05_02.log ls: cannot access /u01/app/oracle/oradata/xiocpt0/p_redo05_02.log: No such file or directory SQL> alter system switch logfile; System altered. SQL> / SQL> / SQL> / SQL> / SQL> alter system checkpoint; System altered. oracle预警日志文件中提示/u01/app/oracle/oradata/xiocpt0/p_redo05_02.log以不存在，由于重作日志group 5有2个成员，数据依旧正常。 Errors in file /u01/app/oracle/diag/rdbms/xiocpt0/xiocpt0/trace/xiocpt0_arc0_1460.trc: ORA-00313: open failed for members of log group 5 of thread 1 ORA-00312: online log 5 thread 1: '/u01/app/oracle/oradata/xiocpt0/p_redo05_02.log' ORA-27037: unable to obtain file status Linux-x86_64 Error: 2: No such file or directory Additional information: 3 Errors in file /u01/app/oracle/diag/rdbms/xiocpt0/xiocpt0/trace/xiocpt0_arc0_1460.trc: ORA-00313: open failed for members of log group 5 of thread 1 ORA-00312: online log 5 thread 1: '/u01/app/oracle/oradata/xiocpt0/p_redo05_02.log' ORA-27037: unable to obtain file status Linux-x86_64 Error: 2: No such file or directory 对group有多个成员的，单成员进行修复 alter database drop logfile member '/u01/app/oracle/oradata/xiocpt0/p_redo05_02.log'; alter database add logfile member '/u01/app/oracle/oradata/xiocpt0/p_redo05_02.log' to group 5; 先将丢失的成员从group中进行删除 SQL> alter database drop logfile member '/u01/app/oracle/oradata/xiocpt0/p_redo05_02.log'; Database altered. SQL> select group#,sequence#,bytes/(1024*1024),members,archived,status from v$log; GROUP# SEQUENCE# BYTES/(1024*1024) MEMBERS ARC STATUS ---------- ---------- ----------------- ---------- --- ---------------- 1 12 50 1 YES INACTIVE 2 11 50 1 YES INACTIVE 3 16 50 1 NO CURRENT 4 13 128 2 YES INACTIVE 5 14 128 1 YES INACTIVE 6 15 128 2 YES INACTIVE 6 rows selected. 再新增成员 SQL> alter database add logfile member '/u01/app/oracle/oradata/xiocpt0/p_redo05_02.log' to group 5; Database altered. SQL> select group#,sequence#,bytes/(1024*1024),members,archived,status from v$log; GROUP# SEQUENCE# BYTES/(1024*1024) MEMBERS ARC STATUS ---------- ---------- ----------------- ---------- --- ---------------- 1 12 50 1 YES INACTIVE 2 11 50 1 YES INACTIVE 3 16 50 1 NO CURRENT 4 13 128 2 YES INACTIVE 5 14 128 2 YES INACTIVE 6 15 128 2 YES INACTIVE 6 rows selected. 也能够对整个group 进行clear，但需注意此group 必须已归档 SQL> !rm /u01/app/oracle/oradata/xiocpt0/p_redo05_02.log SQL> !ls -l /u01/app/oracle/oradata/xiocpt0/p_redo05_02.log ls: cannot access /u01/app/oracle/oradata/xiocpt0/p_redo05_02.log: No such file or directory SQL> alter database clear logfile group 5; Database altered. SQL> !ls -l /u01/app/oracle/oradata/xiocpt0/p_redo05_02.log -rw-r----- 1 oracle dba 134218240 May 22 13:51 /u01/app/oracle/oradata/xiocpt0/p_redo05_02.log
丢失当前重作日志文件
alter database clear unarchived logfile group #;
SQL> select group#,sequence#,bytes/(1024*1024),members,archived,status from v$log; GROUP# SEQUENCE# BYTES/(1024*1024) MEMBERS ARC STATUS ---------- ---------- ----------------- ---------- --- ---------------- 1 12 50 1 YES INACTIVE 2 11 50 1 YES INACTIVE 3 16 50 1 NO CURRENT 4 13 128 2 YES INACTIVE 5 0 128 2 YES UNUSED 6 15 128 2 YES INACTIVE 6 rows selected. SQL> SQL> select group#,status,member from v$logfile; GROUP# STATUS MEMBER ---------- ------- -------------------------------------------------- 1 /u01/app/oracle/oradata/xiocpt0/redo01.log 3 /u01/app/oracle/oradata/xiocpt0/redo03.log 2 /u01/app/oracle/oradata/xiocpt0/redo02.log 4 /u01/app/oracle/oradata/xiocpt0/p_redo04_01.log 4 /u01/app/oracle/oradata/xiocpt0/p_redo04_02.log 5 /u01/app/oracle/oradata/xiocpt0/p_redo05_01.log 5 /u01/app/oracle/oradata/xiocpt0/p_redo05_02.log 6 /u01/app/oracle/oradata/xiocpt0/p_redo06_01.log 6 /u01/app/oracle/oradata/xiocpt0/p_redo06_02.log 9 rows selected. SQL> !rm -rf /u01/app/oracle/oradata/xiocpt0/redo03.log SQL> !ls -l /u01/app/oracle/oradata/xiocpt0/redo03.log ls: cannot access /u01/app/oracle/oradata/xiocpt0/redo03.log: No such file or directory SQL> alter system switch logfile; System altered. SQL> alter system checkpoint; System altered. SQL> alter database clear unarchived logfile group 3; Database altered. SQL> select group#,status,member from v$logfile; GROUP# STATUS MEMBER ---------- ------- -------------------------------------------------- 1 /u01/app/oracle/oradata/xiocpt0/redo01.log 3 /u01/app/oracle/oradata/xiocpt0/redo03.log 2 /u01/app/oracle/oradata/xiocpt0/redo02.log 4 /u01/app/oracle/oradata/xiocpt0/p_redo04_01.log 4 /u01/app/oracle/oradata/xiocpt0/p_redo04_02.log 5 /u01/app/oracle/oradata/xiocpt0/p_redo05_01.log 5 /u01/app/oracle/oradata/xiocpt0/p_redo05_02.log 6 /u01/app/oracle/oradata/xiocpt0/p_redo06_01.log 6 /u01/app/oracle/oradata/xiocpt0/p_redo06_02.log 9 rows selected. SQL> !ls -l /u01/app/oracle/oradata/xiocpt0/redo03.log -rw-r----- 1 oracle dba 52429312 May 22 13:52 /u01/app/oracle/oradata/xiocpt0/redo03.log
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