when plus archivelog is specified ,rman performs the follow actions in sequential order;
1.runs ALTER SYSTEM ARCHIVE LOG CURRENT.
2.runs BACKUP ARCHIVELOG ALL.
3.backup the files specified in the BACKUP COMMAND.
4.runs ALTER SYSTEM ARCHIVE LOG CURRENT.
5.backup any remaining archived redo logs generated during backup.

If backup optimization is enabled, then RMAN skips backups of archived logs that have already been backed up to the allocated devi

os: redhat linux as 3 + u3
db: oracle 10.1.0.4 rac

PLUS ARCHIVELOG方式的备份RMAN执行如下步骤的操作：
1)运行一个ALTER SYSTEM ARCHIVELOG CURRENT命令
2)运行BACKUP ARCHIVELOG ALL命令。注意如果备份优化被启用，RMAN只会备份未备份过的日志
3)备份BACKUP命令中定义的文件
4)运行ALTER SYSTEM ARCHIVELOG CURRENT命令
5)备份所有的剩下的归档日志
BACKUP incremental level 0
format '/opt/rman/orcl/%d_LVL0_%T_%u_s%s_p%p'
database PLUS ARCHIVELOG format '/opt/rman/orcl/%d_AL_%T_%u_s%s_p%p'
delete input;

ITPub博客

当指定PLUS ARCHIVELOG RMAN做了哪些动作？

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