以前正常可以连接数据库，今天早上突然就报了个12547错误
oracle@iZhp3dgm1routfkh0o1dyqZ:/u01/oracle11g/product/11.2.0/dbhome_1/bin$ ./sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Tue Apr 16 10:56:10 2019
Copyright (c) 1982, 2009, Oracle. All rights reserved.
ERROR:
ORA-12547: TNS:lost contact
数据库未启动吧，看日志