When SID=RACDB, the SYS system ora-27101:shared the error memory realm does not exist

One, System user [oracle@t1 ~]$ sqlplus SYSTEM/MANAGER@RACDB1
Sql*plus:release 10.2.0.1.0-production on Mon Sep 2 15:07:29 2013
Copyright (c) 1982, +, Oracle. All rights reserved.

Connected to:oracle Database 10g Enterprise Edition release 10.2.0.1.0-64bit Production and the partitioning, real App Lication clusters, OLAP and Data Mining options
Sql> Conn strmadmin/strmadmin error:ora-01034:oracle not available ora-27101:shared memory realm does not exist Li nux-x86_64 error:2: No such file or directory

Warning:you are no longer connected to ORACLE. Sql> Ho [oracle@t1 ~]$ env | grep ORA oracle_sid=racdb oracle_base=/u1/oracle oracle_home=/u1/oracle/product/10.2.0/db_1
Bash:exot:command not found

Second, sys user [oracle@t1 ~]$ sqlplus sys/sys@racdb1 as Sysdba
Sql*plus:release 10.2.0.1.0-production on Mon Sep 2 15:08:49 2013
Copyright (c) 1982, +, Oracle. All rights reserved.

Connected to:oracle Database 10g Enterprise Edition release 10.2.0.1.0-64bit Production and the partitioning, real App Lication clusters, OLAP and Data Mining options
Sql> Conn strmadmin/strmadmin error:ora-01034:oracle not available ora-27101:shared memory realm does not exist Li nux-x86_64 error:2: No such file or directory

Warning:you are no longer connected to ORACLE.

Sql> Conn strmadmin/strmadmin error:ora-01034:oracle not available ora-27101:shared memory realm does not exist Li nux-x86_64 error:2: No such file or directory

Warning:you are no longer connected to ORACLE. Sql> Conn strmadmin/strmadmin error:ora-01034:oracle not available ora-27101:shared memory realm does not exist Li nux-x86_64 error:2: No such file or directory

Sql> Show user ' "" Sql> exit above this method can solve the problem 1 export oracle_sid=racdb sqlplus system/manager@racdb1 error

2 [oracle@t1 ~]$ export ORACLE_SID=RACDB1 dba Conn strmadmin/strmadmin no error