ORA-12547: TNS:lost contact故障一例

一个朋友安装好aix平台11.2.0.4 rac，dbca创建库报ORA-12547错误.

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尝试sqlplus 登录数据库

$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Thu Nov 17 11:45:33 2022

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

ERROR:
ORA-12547: TNS:lost contact


Enter user-name: 


ERROR:
ORA-12547: TNS:lost contact


Enter user-name: ERROR:
ORA-12547: TNS:lost contact


SP2-0157: unable to CONNECT to ORACLE after 3 attempts, exiting SQL*Plus

使用truss跟踪sqlplus 执行过程,卡在kfork上面

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检查oracle二进制文件权限,正常

$ ls -l $ORACLE_HOME/bin/oracle
-rwsr-s--x    1 oracle   oinstall  309671362 Nov 17 03:13 /u01/app/oracle/product/11.2.0/db/bin/oracle

经过分析确认是oracle home权限异常

$ ls -ld $ORACLE_HOME
drwxrwxr-x   74 grid     oinstall       4096 Nov 17 02:59 /u01/app/oracle/product/11.2.0/db
$ exit
# chown oracle:oinstall /u01/app/oracle/product/11.2.0/db

sqlplus和dbca都正常

$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Thu Nov 17 11:46:32 2022

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> exit
Disconnected