问题描述：重置incarnation时，报错ORA-19910，如下所示：
RMAN> list incarnation;

using target database control file instead of recovery catalog

List of Database Incarnations
DB Key  Inc Key DB Name  DB ID            STATUS  Reset SCN  Reset Time
------- ------- -------- ---------------- --- ---------- ----------
1       1       ORCL     1642676218       PARENT  1          24-AUG-13
2       2       ORCL     1642676218       PARENT  925702     08-SEP-22
3       3       ORCL     1642676218       CURRENT 938040     08-SEP-22

RMAN> reset database to incarnation 2;

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of reset database command on default channel at 09/09/2022 21:15:07
ORA-19910: can not change recovery target incarnation in control file
异常原因：重置到incarnation 2，需要到mount阶段执行.
RMAN> shutdown immediate

database closed
database dismounted
Oracle instance shut down

RMAN> startup mount;

connected to target database (not started)
Oracle instance started
database mounted

Total System Global Area    1586708480 bytes

Fixed Size                     2253624 bytes
Variable Size                989859016 bytes
Database Buffers             587202560 bytes
Redo Buffers                   7393280 bytes

RMAN> reset database to incarnation 2;

database reset to incarnation 2

RMAN> alter database open;

database opened