Oracle 如何規范清理v$archived_log記錄實例詳解
單機實例上面，v$archived_log 很多，有上萬條記錄了，所以得清理一下，不然每次查詢都直接滾屏幕了
SQL> select sequence#,applied from v$archived_log order by sequence# ; SEQUENCE# APPLIED.................... SEQUENCE# APPLIED---------- --------- 9376 NO 9377 NO 9377 NO 9378 NO 9378 NO 9379 NO 9379 NO 9380 NO 9380 NO 9381 NO 9381 NO SEQUENCE# APPLIED---------- --------- 9382 NO 9382 NO11200 rows selected.SQL>
然后查看下當前的歸檔記錄
SQL> archive log list;Database log mode Archive ModeAutomatic archival EnabledArchive destination USE_DB_RECOVERY_FILE_DESTOldest online log sequence 164Next log sequence to archive 166Current log sequence 166SQL>
看到歸檔記錄才是164，和v$archived_log里面上W的記錄數不匹配，這是因為這是rman備份恢復遺留下來的記錄，所以需要清理一下。
清理記錄，采用sys.dbms_backup_restore.resetCfileSection(11);清理：
SQL> execute sys.dbms_backup_restore.resetCfileSection(11);PL/SQL procedure successfully completed.SQL> select sequence#,applied from v$archived_log order by sequence# ;no rows selectedSQL>
再次測試，可以查看到日志記錄變化了，v$archived_log已經是最新的，只有一條記錄數存在了：
SQL> alter system switch logfile;System altered.SQL> select sequence#,applied from v$archived_log order by sequence# ; SEQUENCE# APPLIED---------- --------- 166 NOSQL> execute sys.dbms_backup_restore.resetCfileSection(11);PL/SQL procedure successfully completed.SQL> select sequence#,applied from v$archived_log order by sequence# ;no rows selectedSQL>
擴展話題，單機實例可以用上，述辦法操作，那么Oracle集群比如dg呢，分析master庫、standby庫
#master庫上v$archived_log表記錄數：SQL> select count(1) from v$archived_log; COUNT(1)---------- 623616SQL> #standby庫上v$archived_log表記錄數：SQL> select count(1) from v$archived_log; COUNT(1)---------- 2226823SQL>
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