(Les16 執行數據庫恢復)-重作日誌文件恢復
丟失重作日誌文件
丟失了重作日誌文件組中的某個成員，而且組中至少還有一個成員：
-不會影響實例的正常操做。
-預警日誌中會收到一條信息，通知您沒法找到某個成員
-能夠經過刪除丟失的重作日誌成員並添加新成員來恢復丟失的日誌文件
-若是包含丟失日誌文件的組已歸檔，您能夠清除日誌組來從新建立丟失的文件
恢復步驟：1.肯定是否有缺失的日誌文件2.恢復丟失的文件時，先刪除丟失的重作日誌成員ALTER DATABASE DROP LOGFILE MEMBER '+DATA/orcl/onlinelog/group_1.261.691672257';3.而後添加新成員來替代丟失的日誌成員ALTER DATABASE ADD LOGFILE MEMBER '+DATA' TO GROUP 2;4.若是介質故障是因爲磁盤或控制器缺失而形成的，需重命名丟失文件。5.若是重作日誌組已歸檔，或者處於NOARCHIVELOG模式下，則可選擇在清除日誌組後從新建立缺失來解決問題，ALTER DATABASE CLEAR LOGFILE GROUP n;注意：清除未歸檔的日誌組，應當即對整個數據庫執行徹底備份，不然，在發生其它故障的狀況下，會致使數據丟失。ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP #;
測試環境中先新增3組，每組2個成員
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$log;--查看重作日誌成員狀態信息 col member format a50 SQL> SQL> GROUP# SEQUENCE# BYTES/(1024*1024) MEMBERS ARC STATUS ---------- ---------- ----------------- ---------- --- ---------------- 1 4 50 1 YES INACTIVE 2 5 50 1 NO CURRENT 3 3 50 1 YES INACTIVE 4 0 128 2 YES UNUSED 5 0 128 2 YES UNUSED 6 0 128 2 YES UNUSED 6 rows selected. SQL> select group#,status,member from v$logfile;--查看重作日誌成員，物理路徑，這裏存儲方式爲文件系統 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. 手動刪除group 1的物理文件 SQL> !rm /u01/app/oracle/oradata/xiocpt0/redo01.log group 1的狀態以歸檔，INACTIVE SQL> select group#,sequence#,bytes/(1024*1024),members,archived,status from v$log; GROUP# SEQUENCE# BYTES/(1024*1024) MEMBERS ARC STATUS ---------- ---------- ----------------- ---------- --- ---------------- 1 4 50 1 YES INACTIVE 2 5 50 1 NO CURRENT 3 3 50 1 YES INACTIVE 4 0 128 2 YES UNUSED 5 0 128 2 YES UNUSED 6 0 128 2 YES UNUSED 6 rows selected. 驗證物理文件已被刪除 SQL> !ls -l /u01/app/oracle/oradata/xiocpt0/redo01.log ls: cannot access /u01/app/oracle/oradata/xiocpt0/redo01.log: No such file or directory 針對已歸檔的重作日誌文件組，可使用clear命令進行恢復 alter database clear logfile group 1; SQL> alter database clear logfile group 1; Database altered. 驗證物理文件已恢復完成 SQL> !ls -l /u01/app/oracle/oradata/xiocpt0/redo01.log -rw-r----- 1 oracle dba 52429312 May 22 13:42 /u01/app/oracle/oradata/xiocpt0/redo01.log
切換重作日誌文件
alter system switch logfile;
alter system checkpoint;
測試刪除重作日誌文件組中單個成員
SQL> select group#,sequence#,bytes/(1024*1024),members,archived,status from v$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 刪除group 5中的 02成員 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預警日誌文件中提示/u01/app/oracle/oradata/xiocpt0/p_redo05_02.log以不存在，由於重作日誌group 5有2個成員，數據依舊正常。 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 對group有多個成員的，單成員進行修復 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; 先將丟失的成員從group中進行刪除 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$log; GROUP# SEQUENCE# BYTES/(1024*1024) MEMBERS ARC STATUS ---------- ---------- ----------------- ---------- --- ---------------- 1 12 50 1 YES INACTIVE 2 11 50 1 YES INACTIVE 3 16 50 1 NO CURRENT 4 13 128 2 YES INACTIVE 5 14 128 1 YES INACTIVE 6 15 128 2 YES INACTIVE 6 rows selected. 再新增成員 SQL> alter database add logfile member '/u01/app/oracle/oradata/xiocpt0/p_redo05_02.log' to group 5; Database altered. SQL> select group#,sequence#,bytes/(1024*1024),members,archived,status from v$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. 也能夠對整個group 進行clear，但需注意此group 必須已歸檔 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
丟失當前重作日誌文件
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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