Oracle 如何规范清理v$archived_log记录实例详解

Oracle 如何规范清理v$archived_log记录实例详解

单机实例上面，v$archived_log 很多，有上万条记录了，所以得清理一下，不然每次查询都直接滚屏幕了

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> 

然后查看下当前的归档记录

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> 

看到归档记录才是164，和v$archived_log里面上W的记录数不匹配，这是因为这是rman备份恢复遗留下来的记录，所以需要清理一下。

清理记录，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> 

再次测试，可以查看到日志记录变化了，v$archived_log已经是最新的，只有一条记录数存在了：

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> 

扩展话题，单机实例可以用上，述办法操作，那么Oracle集群比如dg呢，分析master库、standby库

#master库上v$archived_log表记录数：SQL> select count(1) from v$archived_log; COUNT(1)----------  623616SQL> #standby库上v$archived_log表记录数：SQL> select count(1) from v$archived_log; COUNT(1)----------  2226823SQL> 

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