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

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

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：

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：

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

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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