Oracle 如何规范清理v$archived_log记录实例详解
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单机实例上面，v$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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