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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