IT博客汇 | [原]Oracle 如何规范清理v$archived

[原]Oracle 如何规范清理v$archived_log记录

mchdba发表于 2017-05-15 22:56:28

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>