Oracle 如何规范清理v$archived_log记录实例详解

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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 NO
11200 rows selected.
SQL>

然后查看下当前的归档记录

SQL> archive log list;
Database log mode   Archive Mode
Automatic archival   Enabled
Archive destination  USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence   164
Next log sequence to archive  166
Current log sequence    166
SQL>

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 selected
SQL>

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$archived_log order by sequence# ;
 SEQUENCE# APPLIED
---------- ---------
  166 NO
SQL> execute sys.dbms_backup_restore.resetCfileSection(11);
PL/SQL procedure successfully completed.
SQL> select sequence#,applied from v$archived_log order by sequence# ;
no rows selected
SQL>

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

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