执行emctl报错“perl: warning: Setting locale failed”

dbrac1:oracle:orcl1 > emctl status dbconsole
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LC_ALL = (unset),
        LC__FASTMSG = "true",
        LANG = "AMRICAN"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
Oracle Enterprise Manager 11g Database Control Release 11.1.0.6.0
Copyright (c) 1996, 2007 Oracle Corporation.  All rights reserved.

Oracle Enterprise Manager 11g is running.
------------------------------------------------------------------
Logs are generated in directory /u01/app/oracle/product/11.1.0/db/dbrac1_orcl1/sysman/log

根据报错的提示信息，设置相关环境变量
dbrac1:oracle:orcl1 > export LC_ALL=C
dbrac1:oracle:orcl1 > echo $LC_ALL
C
dbrac1:oracle:orcl1 > echo $LC__FASTMSG
true
dbrac1:oracle:orcl1 > echo $LANG
AMRICAN

再次执行emctl命令，发现报错信息消失了。
dbrac1:oracle:orcl1 > emctl status dbconsole
Oracle Enterprise Manager 11g Database Control Release 11.1.0.6.0
Copyright (c) 1996, 2007 Oracle Corporation.  All rights reserved.

Oracle Enterprise Manager 11g is running.
------------------------------------------------------------------
Logs are generated in directory /u01/app/oracle/product/11.1.0/db/dbrac1_orcl1/sysman/log

从命令执行的结果来看，该报错信息不影响emctl命令的正常运行。