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环境
linux 6.8
oracle 11.2.0.4 rac 未打补丁

现象：
数据库日志中显示

datafilecopy header validation failure for file +DATA/orcl/datafile/file1.ora

原因
用rman的backup as copy 对数据文件进行了copy或者叫位置更改时候，在sqlplus中对文件名进行了rename，这个只是更新了v$datafile，而
v$datafile_copy中还未更新，正确的方式是使用rman的switch datafile all命令进行更改。

解决

1. Confirm the name of the current datafiles:RMAN>report schema;2. Confirm the name of the datafile copies (this will show the SAME list of datafiles):RMAN>list copy of database;3. Remove the datafilecopy entries from the rman repository (this will NOT remove the physical
files but simply update the rman repository):RMAN>change datafilecopy <key> uncatalog;You can get <key> value from the list copy of database output - do this for every datafile
that is 'duplicated' in the list copy output.4. Confirm that the copies have been removed:RMAN>list copy of database;