ORA-01034: ORACLE not available / ORA-27101: shared memory realm does not exist

Your java program throws such an exception:

Stack Trace:
java.sql.SQLException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor

        at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:673)
        at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:715)
        at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:385)
        at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:30)
        at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:564)
        at java.sql.DriverManager.getConnection(DriverManager.java:664)
        at java.sql.DriverManager.getConnection(DriverManager.java:247)
        at com.xxx.dbase.DB.connectToDB(DB.java:111)

Caused by: oracle.net.ns.NetException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor

        at oracle.net.ns.NSProtocolStream.negotiateConnection(NSProtocolStream.java:272)
        at oracle.net.ns.NSProtocol.connect(NSProtocol.java:263)
        at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1360)
        at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:486)



When you try to log into sqlplus, you received these messages:

>$ sqlplus mydatabaseID/mydatabasePWD

SQL*Plus: Release 11.2.0.1.0 Production on Tue Aug 7 13:48:22 2018

Copyright (c) 1982, 2009, Oracle.  All rights reserved.

ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux-x86_64 Error: 2: No such file or directory
Process ID: 0
Session ID: 0 Serial number: 0


Enter user-name:


After looking into the system, it turns out that the root user has filled all the space and the system has no space available for oracle users. The problem is fixed by removing some of the files and contents from the system.

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