$ netca
Oracle Net Services Configuration:
JVMDG217: Dump Handler is Processing Signal 11 - Please Wait.
JVMDG303: JVM Requesting Java core file
JVMDG304: Java core file written to /u01/app/oracle/product/10.2.0/db_1/network/tools/javacore21130.1432714051.txt
JVMDG215: Dump Handler has Processed Exception Signal 11.
/u01/app/oracle/product/10.2.0/db_1/bin/netca[190]: 21130 Segmentation fault(coredump)
原因：hosts裏面沒有配置主機名
解決方法：vi /etc/hosts
在最下方添加 ip地址 主機名
修改後立即生效