Sometimes You can get “ORA-27101: shared memory realm does not exist ” error.
Details of error are as follows.
ORA-27101: shared memory realm does not exist
Cause: Unable to locate shared memory realm
Action: Verify that the realm is accessible
This error is related with Invalid ORACLE_HOME and ORACLE_SID or Database is really down.
Check your ORACLE_HOME and ORACLE_SID with echo command, or if database is down start it up again as follows.
SQL> startup ORACLE instance started. Total System Global Area 1224736768 bytes Fixed Size 1219112 bytes Variable Size 167773656 bytes Database Buffers 1040187392 bytes Redo Buffers 15556608 bytes Database mounted. Database opened.
Do you want to learn Oracle Database for Beginners, then read the following articles.
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