執行環境：ubuntu+oracle 11.2.0
為了啟動oracle時間，出現ORA-12547: TNS:lost contact錯誤。
中午好好的納，下午就無論了。以為是鏈接失效，關機重新啟動后還是不行。然后google了一把，找到了以下的解決方法。
回憶了一下，引起的原因是權限的問題，中午的時候不小心該了oracle安裝文件夾的文件夾的權限。看來oracle的權限不能隨便修改。
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
上述步驟完成，重新開始oracle上ok該
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