探索Oracle之RMAN_04非一致性备份，操作非常的简单。只需要一条很短的命令即可完成，但是如果要创建一正式库的备份，一般不建议用在上一篇中提到了数据库的一致性备份（见探索Oracle之RMAN_03非一致性备份），，操作非常的简单。只需要一条很短的命令即可完成，但是如果要创建一正式库的备份，一般不建议用一致性备份，也不建议用很简单的名来完成。而是更多的采用脚本实现非一致性备份，这样将可通过backup+archive log+redo有效的将数据恢复到最近一次改变的状态，可以达到数据的丢失最小化。
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探索Oracle之RMAN_01概念探索Oracle之RMAN_02基本使用探索Oracle之RMAN_03非一致性备份探索Oracle之RMAN_04非一致性备份探索Oracle之RMAN_05增量备份探索Oracle之RMAN_06备份策略创建非一致性备份并且可以在数据库打开并不影响业务的情况下完成数据的备份工作；那么这样的备份将是不一致性的备份，那么如果要恢复可以通过backup+archive log+redo来恢复到最近一次日志切换时候的数据，而不是最后一次备份时候的数据。
1.1
检查归档状态：
SQL> archive log list;Database log modeNo Archive Mode Automaticarchival Disabled Archivedestination USE_DB_RECOVERY_FILE_DEST Oldest onlinelog sequence 9 Current logsequence 11 SQL>必须打开归档归档状态Databaseclosed.
Databasedismounted.
ORACLE instanceshut down.
SQL> startup mount;ORACLE instancestarted.
Total SystemGlobal Area 285212672 bytes Fixed Size 1218968 bytes VariableSize 79693416 bytes DatabaseBuffers 197132288 bytes RedoBuffers 7168000 bytes Databasemounted.
Databasealtered.
Databasealtered.
SQL> colinstance_name format a15 INSTANCE_NAME STATUS---------------------------------------WWL OPEN SQL>SQL> archive log list;------查看归档状态，已经是归档状态了Database log mode Archive Mode Automatic archival Enabled Archivedestination USE_DB_RECOVERY_FILE_DEST Oldest onlinelog sequence 9 Next logsequence to archive 11 Current logsequence 11 SQL>
1.2
执行备份(执行备份命令实际上是跟一致性备份是一样的)
1.2.1
备份数据库RMAN> backup database;Starting backupat 23-MAY-12 allocatedchannel: ORA_DISK_1 channelORA_DISK_1: sid=145 devtype=DISK channelORA_DISK_1: starting full datafile backupset channelORA_DISK_1: specifying datafile(s) in backupset input datafilefno=00001 name=/DBData/WWL/system01.dbf input datafilefno=00003 name=/DBData/WWL/sysaux01.dbf input datafilefno=00002 name=/DBData/WWL/undotbs01.dbf input datafilefno=00004 name=/DBData/WWL/users01.dbf channelORA_DISK_1: starting piece 1 at 23-MAY-12 channelORA_DISK_1: finished piece 1 at 23-MAY-12 piecehandle=/DBBak/bak_WWL_05_23_0anbmtkr_1_1 tag=TAG20120523T121210 comment=NONE channelORA_DISK_1: backup set complete, elapsed time: 00:01:46 Finished backupat 23-MAY-12 Starting ControlFile and SPFILE Autobackup at 23-MAY-12 piecehandle=/DBSoft/product/10.2.0/db_1/dbs/c-5520179-20120523-00 comment=NONE Finished ControlFile and SPFILE Autobackup at 23-MAY-12 RMAN>