RMAN中通过时间点不完全恢复报ORA-01841的解决办法
在Linux中，对数据库进行RMAN不完全恢复。执行recover database until time
在Linux中，对数据库进行RMAN不完全恢复。执行recover database until time 'xxxx' 时报错：
ORA-01841 (full) year must be between -4713 and +4713 / +9999 and must not be 0
怎么改格式都无效。
解决方法是，设置操作系统的NLS_LANG环境变量，，例如 export NLS_LANG=AMERICAN_AMERICA.AL32UTF8
附上该错误的一个相关bug，不过该bug已在Oracle 9i中修复：
Recovery Manager Tablespace Point in Time Recovery fails if the format used by
NLS_DATE_FORMAT does not lead with a month.
If NLS_DATE_FORMAT leads with a Year then ORA-01841 is returned.
If NLS_DATE_FORMAT leads with a Day then ORA-01858 is returned.
This bug only affects the Tablespace Point in Time Recovery feature.
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