Oracle學習(九)之刪除日誌組和日誌檔案
阿新 • • 發佈:2019-01-25
1.刪除日誌組
1)檢視日誌組(CURRENT狀態的日誌組需要切換日誌,其他狀態的可以刪除)
SQL> select GROUP#,status from v$log;
GROUP# STATUS
---------- ----------------
1 INACTIVE
2 INACTIVE
3 CURRENT
8 UNUSED
2)刪除日誌組
SQL> alter database drop logfile group 8; Database altered.
3)查詢
SQL> select GROUP#,status from v$log;
GROUP# STATUS
---------- ----------------
1 INACTIVE
2 INACTIVE
3 CURRENT
2.刪除日誌檔案
1)檢視日誌組(CURRENT狀態的日誌組需要切換日誌,其他狀態的可以刪除)
SQL> select GROUP#,status from v$log; GROUP# STATUS ---------- ---------------- 2 INACTIVE 3 CURRENT
2)檢視日誌檔案
SQL> select GROUP#,MEMBER from v$logfile order by 1,2; GROUP# MEMBER ---------- ------------------------------------ 2 /u04/ora11g/student/redo0202.rdo 2 /u04/ora11g/student/redo0302.rdo 2 /u04/ora11g/student/redo0402.rdo 3 /u05/ora11g/student/redo0103.rdo 3 /u05/ora11g/student/redo0203.rdo 3 /u05/ora11g/student/redo0303.rdo 6 rows selected.
3)刪除日誌檔案
SQL> alter database drop logfile member
2 '/u04/ora11g/student/redo0402.rdo';
Database altered.
4)查詢
SQL> select GROUP#,MEMBER from v$logfile order by 1,2;
GROUP# MEMBER
---------- ------------------------------------
2 /u04/ora11g/student/redo0202.rdo
2 /u04/ora11g/student/redo0302.rdo
3 /u05/ora11g/student/redo0103.rdo
3 /u05/ora11g/student/redo0203.rdo
3 /u05/ora11g/student/redo0303.rdo
刪除成功。
注:
刪除日誌組(檔案)時:
1)該日誌檔案所在的的日誌組(檔案)不能處於current狀態,需要執行一次手動日誌切換;
SQL> alter system switch logfile;
System altered.
2)該日誌檔案所在的日誌檔案組中必須包含有其他的日誌成員;
3)刪除日誌檔案組時必須有其他的日誌檔案組;
4)如果資料庫執行在歸檔模式下,則應該在刪除日誌檔案之前,確定它所在的日誌檔案組已經被歸檔,否則會導致資料丟失。