Oracle 如何规范清理v$archived_log记录实例详解
Oracle如何规范清理v$archived_log记录实例详解
单机实例上面，v$archived_log很多，有上万条记录了，所以得清理一下，不然每次查询都直接滚屏幕了
SQL>selectsequence#,appliedfromv$archived_logorderbysequence#; SEQUENCE#APPLIED .................... SEQUENCE#APPLIED ------------------- 9376NO 9377NO 9377NO 9378NO 9378NO 9379NO 9379NO 9380NO 9380NO 9381NO 9381NO SEQUENCE#APPLIED ------------------- 9382NO 9382NO 11200rowsselected. SQL>
然后查看下当前的归档记录
SQL>archiveloglist; DatabaselogmodeArchiveMode AutomaticarchivalEnabled ArchivedestinationUSE_DB_RECOVERY_FILE_DEST Oldestonlinelogsequence164 Nextlogsequencetoarchive166 Currentlogsequence166 SQL>
看到归档记录才是164，和v$archived_log里面上W的记录数不匹配，这是因为这是rman备份恢复遗留下来的记录，所以需要清理一下。
清理记录，采用sys.dbms_backup_restore.resetCfileSection(11);清理：
SQL>executesys.dbms_backup_restore.resetCfileSection(11); PL/SQLproceduresuccessfullycompleted. SQL>selectsequence#,appliedfromv$archived_logorderbysequence#; norowsselected SQL>
再次测试，可以查看到日志记录变化了，v$archived_log已经是最新的，只有一条记录数存在了：
SQL>altersystemswitchlogfile; Systemaltered. SQL>selectsequence#,appliedfromv$archived_logorderbysequence#; SEQUENCE#APPLIED ------------------- 166NO SQL>executesys.dbms_backup_restore.resetCfileSection(11); PL/SQLproceduresuccessfullycompleted. SQL>selectsequence#,appliedfromv$archived_logorderbysequence#; norowsselected SQL>
扩展话题，单机实例可以用上，述办法操作，那么Oracle集群比如dg呢，分析master库、standby库
#master库上v$archived_log表记录数： SQL>selectcount(1)fromv$archived_log; COUNT(1) ---------- 623616 SQL> #standby库上v$archived_log表记录数： SQL>selectcount(1)fromv$archived_log; COUNT(1) ---------- 2226823 SQL>
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