RMAN 配置归档日志删除策略
Oracle 11g中对于归档日志的删除，除了遵循RMAN保留策略外，也可以通过RMAN来配置归档日志的删除策略，也就是归档日志何时可以被
Oracle 11g中对于归档日志的删除，，除了遵循RMAN保留策略外，也可以通过RMAN来配置归档日志的删除策略，也就是归档日志何时可以被删除。归档日志删除策略适用于所有归档位置(使用快速闪回区FRA/不使用FRA )。本文主要描述归档日志删除策略并给出了具体的演示。
1、关于归档日志删除策略
也就是哪些归档日志符合删除策略能够被删除，如前所述，归档位置适用于所有归档位置(使用快速闪回区FRA/不使用FRA)
当启用该策略后，如归档日志存在于FRA中，则Oracle会尽可能根据保留他们，一旦FRA空间告急，则Oracle会根据归档日志删除策略自动删除
对于不在FRA中的归档日志，需要手动使用delete obsolete或delete archivelog方式来删除日志
无论归档日志存在于FRA内或外，都可以通过BACKUP ... DELETE INPUT or DELETE ARCHIVELOG方式来删除
该策略不适用于使用LogMiner方式从主数据库传送到逻辑standby生成的外部归档日志文件，因为这些日志文件不能够在逻辑standy上备份或恢复
2、配置归档日志删除策略
使用下面的方式来配置归档日志删除策略
configure archivelog deletion policy to backed up 2 times to sbt;
configure archivelog deletion policy to backed up 1 times to device type disk;
configure archivelog deletion policy to applied on standby;
configure archivelog deletion policy to shipped on standby;
configure archivelog deletion policy clear;
对于Oracle 10g没有该特性，但有一个类似的用于配置归档日志被备份次数，如下；
configure archivelog backup copies for device type disk to ${archiveretention};
3、禁用归档日志删除策略
缺省情况下，该策略被设置为none。也就是说根据RMAN备份保留策略，对于FRA中的归档日志，被备份过一次(到磁盘或磁带)即符合条件被删除
如果Oracle不再需要当前的归档日志用于保证数据库时点恢复或数据库闪回，则RMAN备份保留策略认为当前日志为obsolete
在SYSDATE-'DB_FLASHBACK_RETENTION_TARGET'之后创建的归档日志是需要被保留的
4、启用归档日志删除策略
一旦启用该策略，则指定的归档日志被备份数量达到设定值后，这些归档日志能够被删除
BACKUP ARCHIVELOG 会在未超出指定备份数的情况下(比如设置为2)备份归档日志到指定位置，如超出2次，则RMAN会跳过这些备份过2次的归档日志
对于上述的情形，可以为BACKUP ARCHIVELOG适用force选项来强制备份归档日志
如果启用该策略且配置为APPLIED ON STANDBY子句，则所有强制standby位置被apply后，这些归档日志会被RMAN删除
如果启用该策略且配置为SHIPPED ON STANDBY子句，则所有强制standby位置被成功传送后，这些归档日志会被RMAN删除
更多详情见请继续阅读下一页的精彩内容：
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