在命令启动oracle时，出现ora-12547: tns:lost contact错误。中午好好的纳，下午就不管了。以为是链接失效，关机重启后还是不行。
运行环境：ubuntu+oracle 11.2.0
在命令启动oracle时，出现ora-12547: tns:lost contact错误。中午好好的纳，下午就不管了。以为是链接失效，，关机重启后还是不行。然后google了一把，找到了下面的解决方法。回想了一下，引起的原因是权限的问题，中午的时候不小心该了oracle安装目录的文件夹的权限，看来oracle的权限不能随便改动。
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cause
1. this could be due to kernel parameters settings
2. incorrect permissions on the oracle executable
solution
to implement the solution, please execute the following steps:
1.
 this could be due to kernel parameters settings
 please check the notes below that provide the required settings for kernel parameters
 note 169706.1 oracle database on aix,hp-ux,linux,macosx,solaris,tru64
 note 201021.1 solaris: quick start guide - 9.2.0 rdbms installation
2.
 this could be due to incorrect permissions on the oracle.exe
 the 'ls' command should show permissions 6751 (as follows)
please check the following:
$ cd $oracle_home/bin
 $ ls -l oracle
the output should be
 -rwsr-s--x 1 oracle dba
if not then please execute the following
 $ chmod 6751 oracle
please also verify if the following are correct
echo $oracle_home
 echo $oracle_sid
 echo $ld_library_path
 echo $path
3.
 if the above does not resolve i suggest that you shutdown the database and listener and then
 relink all
 note 131321.1 how to relink oracle database software on unix
 完成以上步骤，再次启动oracle就ok了
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