1.现象
ora-12162:tns:net service name is incurrentlyspecified
2.原因

ora-12162:tns:net service name is incurrentlyspecified
oracle下的oracle_sid没设置环境变量

3.解决办法
vi ~/.bash_profile 添加:
export ORACLE_SID=ORCL
source ~/.bash_profile
再次登录sqlplus / as sysdba 成功

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