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.274.9832027612    0        SYSAUX               ***     +DATA/jmrac/datafile/sysaux.275.9832027613    0        UNDOTBS1             ***     +DATA/jmrac/datafile/undotbs1.276.9832027614    0        USERS                ***     +DATA/jmrac/datafile/users.277.9832027615    0        EXAMPLE              ***     +DATA/orcl/datafile/example.285.9832028596    0        UNDOTBS2             ***     +DATA/orcl/datafile/undotbs2.286.983203157List of Temporary Files=======================File Size(MB) Tablespace           Maxsize(MB) Tempfile Name---- -------- -------------------- ----------- --------------------1    20       TEMP                 32767       +DATA/orcl/tempfile/temp.284.983202853RMAN> RMAN> CATALOG START WITH '+DATA/orcl';searching for all files that match the pattern +DATA/orclList of Files Unknown to the Database=====================================File Name: +data/ORCL/DATAFILE/SYSTEM.294.984744009File Name: +data/ORCL/DATAFILE/SYSAUX.295.984744009File Name: +data/ORCL/DATAFILE/EXAMPLE.277.984744009File Name: +data/ORCL/DATAFILE/UNDOTBS1.276.984744009File Name: +data/ORCL/DATAFILE/UNDOTBS2.275.984744009File Name: +data/ORCL/DATAFILE/USERS.274.984744009Do you really want to catalog the above files (enter YES or NO)? yescataloging files...cataloging doneList of Cataloged Files=======================File Name: +data/ORCL/DATAFILE/SYSTEM.294.984744009File Name: +data/ORCL/DATAFILE/SYSAUX.295.984744009File Name: +data/ORCL/DATAFILE/EXAMPLE.277.984744009File Name: +data/ORCL/DATAFILE/UNDOTBS1.276.984744009File Name: +data/ORCL/DATAFILE/UNDOTBS2.275.984744009File Name: +data/ORCL/DATAFILE/USERS.274.984744009RMAN> 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.294.9847440092    690      SYSAUX               ***     +DATA/orcl/datafile/sysaux.295.9847440093    95       UNDOTBS1             ***     +DATA/orcl/datafile/undotbs1.276.9847440094    36       USERS                ***     +DATA/orcl/datafile/users.274.9847440095    330      EXAMPLE              ***     +DATA/orcl/datafile/example.277.9847440096    50       UNDOTBS2             ***     +DATA/orcl/datafile/undotbs2.275.984744009List of Temporary Files=======================File Size(MB) Tablespace           Maxsize(MB) Tempfile Name---- -------- -------------------- ----------- --------------------1    20       TEMP                 32767       +DATA/orcl/tempfile/temp.284.983202853