今天登錄一臺服務器用roote用戶登錄的,在切換到oracle用戶，執行sqlplus sys/ as sysdba進入數據庫提示如下錯誤：
SP2-0750: You may need to set ORACLE_HOME to your Oracle software directory
在/home/oracle目錄下查看文件.bash_profile，它是隱藏文件。
$ cat .bash_profile # .bash_profile # Get the aliases and functions if [ -f ~/.bashrc ]; then . ~/.bashrc fi # User specific environment and startup programs PATH=$PATH:$HOME/bin export PATH export ORACLE_BASE=/u01/app/oracle export ORACLE_HOME=/u01/app/oracle/product/11.1.0/db_1 export ORACLE_SID=orcl export PATH=$ORACLE_HOME/bin:$PATH export LD_LIBRARY_PATH=$ORACLE_HOME/lib LANG=zh_CN.UTF-8; export LANG NLS_LANG='SIMPLIFIED CHINESE_CHINA.AL32UTF8'; export NLS_LANG
[oracle@localhost ~]$ cd $ORACLE_HOME
-bash: cd: /u01/app/oracle/product/11.1.0/db_1: 沒有那個文件或目錄
發現oracle安裝定義的家目錄是在/u01/app/oracle/product/11.1.0/db_1目錄下的 u01目錄是root用戶的權限，在切回到root用戶，執行如下命令： [root@localhost ~]# cd $ORACLE_HOME [root@localhost dbhome_1]# pwd /u01/app/oracle/product/11.2.0/dbhome_1 [root@localhost dbhome_1]# sqlplus / as sysdba 或是 [root@localhost dbhome_1]# cd bin [root@localhost dbhome_1]# pwd /u01/app/oracle/product/11.2.0/dbhome_1/bin [root@localhost bin]# ./sqlplus / as sysdba SQL*Plus: Release 11.2.0.4.0 Production on Thu Oct 12 17:20:48 2017 Copyright (c) 1982, 2013, Oracle. All rights reserved. Enter password: Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL>
問題解決！