1，数据库异机恢复数据文件显示为0
解决方法：
CATALOG START WITH
SWITCH DATABASE TO COPY;
RMAN> report schema;
List of Permanent Datafiles
===========================
File Size(MB) Tablespace RB segs Datafile Name
---- -------- -------------------- ------- ------------------------
1 0 SYSTEM *** +DATA/jmrac/datafile/system.274.983202761
2 0 SYSAUX *** +DATA/jmrac/datafile/sysaux.275.983202761
3 0 UNDOTBS1 *** +DATA/jmrac/datafile/undotbs1.276.983202761
4 0 USERS *** +DATA/jmrac/datafile/users.277.983202761
5 0 EXAMPLE *** +DATA/orcl/datafile/example.285.983202859
6 0 UNDOTBS2 *** +DATA/orcl/datafile/undotbs2.286.983203157
List of Temporary Files
=======================
File Size(MB) Tablespace Maxsize(MB) Tempfile Name
---- -------- -------------------- ----------- --------------------
1 20 TEMP 32767 +DATA/orcl/tempfile/temp.284.983202853
RMAN>
RMAN> CATALOG START WITH '+DATA/orcl';
searching for all files that match the pattern +DATA/orcl
List of Files Unknown to the Database
=====================================
File Name: +data/ORCL/DATAFILE/SYSTEM.294.984744009
File Name: +data/ORCL/DATAFILE/SYSAUX.295.984744009
File Name: +data/ORCL/DATAFILE/EXAMPLE.277.984744009
File Name: +data/ORCL/DATAFILE/UNDOTBS1.276.984744009
File Name: +data/ORCL/DATAFILE/UNDOTBS2.275.984744009
File Name: +data/ORCL/DATAFILE/USERS.274.984744009
Do you really want to catalog the above files (enter YES or NO)? yes
cataloging files...
cataloging done
List of Cataloged Files
=======================
File Name: +data/ORCL/DATAFILE/SYSTEM.294.984744009
File Name: +data/ORCL/DATAFILE/SYSAUX.295.984744009
File Name: +data/ORCL/DATAFILE/EXAMPLE.277.984744009
File Name: +data/ORCL/DATAFILE/UNDOTBS1.276.984744009
File Name: +data/ORCL/DATAFILE/UNDOTBS2.275.984744009
File Name: +data/ORCL/DATAFILE/USERS.274.984744009
RMAN> SWITCH DATABASE TO COPY;
datafile 1 switched to datafile copy "+DATA/orcl/datafile/system.294.984744009"
datafile 2 switched to datafile copy "+DATA/orcl/datafile/sysaux.295.984744009"
datafile 3 switched to datafile copy "+DATA/orcl/datafile/undotbs1.276.984744009"
datafile 4 switched to datafile copy "+DATA/orcl/datafile/users.274.984744009"
datafile 5 switched to datafile copy "+DATA/orcl/datafile/example.277.984744009"
datafile 6 switched to datafile copy "+DATA/orcl/datafile/undotbs2.275.984744009"
RMAN> report schema;
List of Permanent Datafiles
===========================
File Size(MB) Tablespace RB segs Datafile Name
---- -------- -------------------- ------- ------------------------
1 810 SYSTEM *** +DATA/orcl/datafile/system.294.984744009
2 690 SYSAUX *** +DATA/orcl/datafile/sysaux.295.984744009
3 95 UNDOTBS1 *** +DATA/orcl/datafile/undotbs1.276.984744009
4 36 USERS *** +DATA/orcl/datafile/users.274.984744009
5 330 EXAMPLE *** +DATA/orcl/datafile/example.277.984744009
6 50 UNDOTBS2 *** +DATA/orcl/datafile/undotbs2.275.984744009
List of Temporary Files
=======================
File Size(MB) Tablespace Maxsize(MB) Tempfile Name
---- -------- -------------------- ----------- --------------------
1 20 TEMP 32767 +DATA/orcl/tempfile/temp.284.983202853
