Oracle RAC集群环境下删除归档日志
Oracle 10G、oracle11g、oracle 12C版本如果操作系统是AIX、HPUX、Linux下，一般都会采取ASM建库方式，特别是oracle 11g和oracle
归档日志存放形式主要存放方式有以下方式：
一、ASM方式
Oracle 10G、oracle11g、oracle 12C版本如果操作系统是AIX、HPUX、Linux下，，一般都会采取ASM建库方式，特别是oracle 11g和oracle12C，因为oracle已经不支持裸设备建库（手工建库还是可以裸设备），如果没有购买HACMP、HP MC软件，那一般开启归档，归档日志只能放在ASM上面，当然也可以放在本地磁盘上，那样子备份难度就增加，也麻烦。
Oracle RAC环境下归档日志的备份
Oracle 归档日志
Oracle 控制文件(CONTROLFILE)
Oracle 联机重做日志文件(ONLINE LOG FILE)
Linux/Unix shell 脚本中调用SQL,RMAN脚本
Linux/Unix shell 脚本清除归档日志文件
二、共享文件系统
AIX和HPUX可以用集群软件做成并发卷，采用共享文件系统存放，Linux可以oracle的OCFS共享集群文件系统。
三、本地磁盘文件系统
这个就很简单了，在本地文件系统创建目录，将归档路径指向各自节点的磁盘路径就可以。
这种方式的归档备份复杂，容易出错，不建议采用。
针对以上三种方式要删除归档日志，除了第一种有点复杂外，其他两种都是直接进入对应的路径下就可以进行删除操作，建议删除归档日志的顺序以最早的日志删除，不要删除最新的归档日志，下面着重介绍ASM下的归档日志删除。
切换到oracle的安装用户下，oracle10g一般只有一个用户如oracle，oracle11g以上一般会用grid这个用户。
root#su - oracle【root用户下】
oracle$export ORACLE_SID=rac1 【切换到oracle下】
oracle$asmcmd
asmcmd>
asmcmd>cd ARCH
asmcmd>cd arch1
asmcmd>pwd
+ARCH/arch1
asmcmd>rm 20140413*.dbf
这样子就能删除归档日志文件。
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