在ORACLE 10g数据库还原过程遭遇RMAN-06023: no backup or copy of datafile x found to restore，具体情况如下所示
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File Name: /u03/flash_recovery_area/EPPS/archivelog/2015_01_26/o1_mf_1_10_bdcwsc6t_.arc
File Name: /u03/flash_recovery_area/EPPS/archivelog/2015_01_26/o1_mf_1_23_bdcxwwx6_.arc
File Name: /u03/flash_recovery_area/EPPS/archivelog/2015_01_26/o1_mf_1_16_bdcxwgmd_.arc
File Name: /u03/flash_recovery_area/EPPS/archivelog/2015_01_26/o1_mf_1_39_bdczfb6o_.arc
File Name: /u03/flash_recovery_area/EPPS/archivelog/2015_01_26/o1_mf_1_40_bdczzotd_.arc
File Name: /u03/flash_recovery_area/EPPS/archivelog/2015_01_26/o1_mf_1_19_bdcxwmoy_.arc
File Name: /u03/flash_recovery_area/EPPS/archivelog/2015_01_26/o1_mf_1_31_bdcyvsk0_.arc
using channel ORA_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 03/06/2015 21:56:26
RMAN-06026: some targets not found - aborting restore
RMAN-06023: no backup or copy of datafile 4 found to restore
RMAN-06023: no backup or copy of datafile 3 found to restore
RMAN-06023: no backup or copy of datafile 1 found to restore
RMAN>
在RMAN里面使用restore database validate验证备份时也报RMAN-06023错误
RMAN> list backup of datafile 1;
using target database control file instead of recovery catalog
List of Backup Sets
===================
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
46739 Full 1.75G DISK 00:16:07 05-MAR-15
BP Key: 50263 Status: AVAILABLE Compressed: YES Tag: TAG20150305T010709
Piece Name: /u03/flash_recovery_area/backup/backupsets/ora_df873514789_s46810_s1
List of Datafiles in backup set 46739
File LV Type Ckp SCN Ckp Time Name
---- -- ---- ---------- --------- ----
1 Full 17572554495 05-MAR-15 /u01/app/oracle/oradata/epps/system01.dbf
RMAN> list backup of datafile 3;
List of Backup Sets
===================
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
46736 Full 8.83G DISK 00:52:30 05-MAR-15
BP Key: 50260 Status: AVAILABLE Compressed: YES Tag: TAG20150305T010709
Piece Name: /u03/flash_recovery_area/backup/backupsets/ora_df873508030_s46807_s1
List of Datafiles in backup set 46736
File LV Type Ckp SCN Ckp Time Name
---- -- ---- ---------- --------- ----
3 Full 17571362089 05-MAR-15 /u01/app/oracle/oradata/epps/sysaux01.dbf
[oracle@getlnx01 archivelog]$ ls /u03/flash_recovery_area/backup/backupsets/ora_df873508030_s46807_s1
/u03/flash_recovery_area/backup/backupsets/ora_df873508030_s46807_s1
检查备份文件，发现都是存在的，根本没有问题。最后检查发现是incarnation的问题，因为中间我对该数据库做了一次不完全恢复，做了resetlogs操作。
RMAN> list incarnation;
List of Database Incarnations
DB Key Inc Key DB Name DB ID STATUS Reset SCN Reset Time
------- ------- -------- ---------------- --- ---------- ----------
1 1 EPPS 2179993557 PARENT 1 30-JUN-05
2 2 EPPS 2179993557 PARENT 446075 19-JUL-09
3 3 EPPS 2179993557 CURRENT 16926695161 23-JAN-15
解决方法：
重置数据库的incarnation到2，然后还原数据库，问题解决。关于incarnation的资料，可以参考官方资料7.6.2 Point-in-Time Recovery and Database Incarnations: Concepts
RMAN> reset database to incarnation 2;
database reset to incarnation 2
