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8/12/2019 Oracle Service Do Not Start
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25/11/13 One Can Succeed at Almost Anything For Which He Has Enthusiasm...: ORA-01034 & ORA-27101: Shared Memory Realm Does Not Exist
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One Can Succeed at Almost Anything For Which He HasEnthusiasm...
TUESDAY , FEBRUARY 7, 2012
ORA-01034 & ORA-27101: Shared Memory Realm Does Not Exist
ORA-27101 and ORA-01034 combined may occurs in various scenarios .One of the reason for this
error is that the database is not up. When we try to connect with oracle database or sometimes during
installation we may get this e rror . We may face this error in some other scenario's too . Here are few
poss ible scenario's ( some scenario's are from window platform and some are from Linux platform ) .
Case 1 : When try to connect with normal user we get the error as
C:\>sqlplus
SQL*Plus: Release 11.2.0.1.0 Production on Mon Feb 6 11:22:08 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Enter use r-name: scott
Enter password:
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Process ID: 0
Session ID: 0 Serial number: 0
To solve this issue , set the ORACLE_SID and start the database using the "sys" user as sysdba and
start the database ,
C:\ >set ORACLE_SID=noida
C:\ >sqlplus sys/xxxx@noida as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Mon Feb 6 11:25:13 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 535662592 bytes
Fixed Size 1375792 bytes
Variable Size 331350480 bytes
Database Buffers 197132288 bytes
Redo Buffers 5804032 bytes
Database mounted.
Database opened.
Case 2 : On a system with multiple IP addresses, when we connect with sqlplus locally on the server
(i.e. "sqlplus user/password") everything is OK, but connecting through a TNS alias, either from the
network or locally on the server, we get the the following errors :
$ sqlplus user/password@db_aliasERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
SVR4 Error: 2: No such file or directory
We need to Manua lly startup the database o r check whethe r the listener is started or not . So either
connect as
$export ORACLE_SID=noida
$ sqlplus sys/password as sysdba
SQL>startup
or
check the status of listener if not started then sta rt the listener as
$lsnrctl
lsnrctl> stop
lsnrctl>start
lsnrctl>exit
$export ORACLE_SID=noida$sqlplus sys/password@noida as sysdba
SQL> startup
Case 3 : Make sure while connecting, that the ORACLE_SID and ORACLE_HOME is correctly set . There
should not be trailing trash in ORACLE_HOME path . Remove the extra "/" from the end of
ORACLE_HOME
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8/12/2019 Oracle Service Do Not Start
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25/11/13 One Can Succeed at Almost Anything For Which He Has Enthusiasm...: ORA-01034 & ORA-27101: Shared Memory Realm Does Not Exist
neeraj-dba.blogspot.com.br/2012/02/ora-01034-ora-27101-shared-memory-realm.html 2/4
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Posted by NEERAJ VISHEN at Tuesday, February 07, 2012
Incorrect Home location: (ORACLE_HOME = /u01/app/oracle/product/11.2.0/)
Correct Home location : (ORACLE_HOME = /u01/app/oracle/product/9.2.0)
Once , we have correctly set the path then reload the listener and set or export ORACLE_SID
before connecting as :
Linux :
$export ORACLE_SID=noida
$sqlplus sys/xxxx@noida as sysdba
SQL> startup
Window :
C:\> set ORACLE_SID=noidaC:\> sqlplus sys/xxxx@noida as sysdba
C:\> startup
Case 4 : Sometimes in case of window , if event log is full , then we get this error . So delete the
event logs and try to connect again .
Case 5 : Sometimes , in case of window , we reso lve this issue by simply restart the oracle services .
so restart the window services as
start --> cmd --- > net stop oracleserviceXXXX
--- >> net start oracleservice .
Enjoy :-)
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3 comments:
Madhu Sudhana Reddy said...
good document
July 12, 2012 at 4:15 PM
Anonymous said...
Thanks a lot guru! You saved my day.
August 28, 2012 at 9:50 PM
Ewerton Costa said...When I execute the startup command I get TNS:listener does not currently know of service requested
in connect descriptor. Any hints?
October 29, 2012 at 9:56 PM
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