I'm using Oracle Database 12c R2 on my Elementary OS 5.0. The install is complete without any error. Then I create listener and it started just fine.
When I create database using dbca it shows warning
ORA-12547: TNS:lost contact
( when I run tnsping 127.0.0.1 it returns OK (0 msec) )
After I click ignore, it shows this error
and the log is
[Thread-70] [ 2019-07-26 16:27:42.193 WIB ] [RMANEngine.readSqlOutput:988] Log RMAN Output=
[Thread-70] [ 2019-07-26 16:27:42.193 WIB ] [RMANEngine.readSqlOutput:988] Log RMAN Output=Recovery Manager: Release 12.2.0.1.0 - Production on Fri Jul 26 16:27:42 2019
[Thread-70] [ 2019-07-26 16:27:42.193 WIB ] [RMANEngine.readSqlOutput:988] Log RMAN Output=
[Thread-70] [ 2019-07-26 16:27:42.193 WIB ] [RMANEngine.readSqlOutput:988] Log RMAN Output=Copyright (c) 1982, 2017, Oracle and/or its affiliates. All rights reserved.
[Thread-70] [ 2019-07-26 16:27:42.764 WIB ] [RMANEngine.readSqlOutput:988] Log RMAN Output=
[Thread-70] [ 2019-07-26 16:27:42.765 WIB ] [RMANEngine.readSqlOutput:988] Log RMAN Output=RMAN>
[Thread-70] [ 2019-07-26 16:27:42.861 WIB ] [RMANEngine.readSqlOutput:988] Log RMAN Output=RMAN-00571: ===========================================================
[Thread-70] [ 2019-07-26 16:27:42.862 WIB ] [RMANEngine.readSqlOutput:988] Log RMAN Output=RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
[Thread-70] [ 2019-07-26 16:27:42.862 WIB ] [RMANEngine.readSqlOutput:988] Log RMAN Output=RMAN-00571: ===========================================================
[Thread-70] [ 2019-07-26 16:27:42.862 WIB ] [RMANEngine.readSqlOutput:988] Log RMAN Output=ORA-12547: TNS:lost contact
[Thread-70] [ 2019-07-26 16:27:42.877 WIB ] [RMANEngine.readSqlOutput:988] Log RMAN Output=
[Thread-70] [ 2019-07-26 16:27:42.878 WIB ] [RMANEngine.readSqlOutput:988] Log RMAN Output=RMAN>
[Thread-70] [ 2019-07-26 16:27:42.878 WIB ] [RMANEngine.readSqlOutput:988] Log RMAN Output=echo set on
[Thread-70] [ 2019-07-26 16:27:42.878 WIB ] [RMANEngine.readSqlOutput:988] Log RMAN Output=set echo off;
[Thread-70] [ 2019-07-26 16:27:42.878 WIB ] [RMANEngine.readSqlOutput:1031] hasError is true
[Thread-70] [ 2019-07-26 16:27:42.879 WIB ] [RMANEngine.readSqlOutput:1037] ERROR TRACE DETECTED
[Thread-70] [ 2019-07-26 16:27:42.879 WIB ] [RMANEngine.readSqlOutput:1044] m_errHdlr=null
[Thread-70] [ 2019-07-26 16:27:42.879 WIB ] [RMANEngine.readSqlOutput:1068] FATAL ERROR DETECTED
[Thread-70] [ 2019-07-26 16:27:42.879 WIB ] [RMANEngine.readSqlOutput:1132] Notifying writer to proceed because m_bInterrupted=falsebNotify=truem_bReaderDone=truem_bFatalErrorOccured=true
[Thread-63] [ 2019-07-26 16:27:42.892 WIB ] [RMANEngine.executeImpl:1333] Completed wait from reader
[Thread-63] [ 2019-07-26 16:27:42.892 WIB ] [RMANEngine.executeImpl:1348] Calling done as got exception
[Thread-63] [ 2019-07-26 16:27:42.892 WIB ] [RMANEngine.done:1654] Done called
[Thread-63] [ 2019-07-26 16:27:42.895 WIB ] [RMANEngine.executeImpl:1375] GOT FATAL Error=Recovery Manager: Release 12.2.0.1.0 - Production on Fri Jul 26 16:27:42 2019
Copyright (c) 1982, 2017, Oracle and/or its affiliates. All rights reserved.
RMAN>
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
ORA-12547: TNS:lost contact
RMAN>
echo set on
[Thread-63] [ 2019-07-26 16:27:42.895 WIB ] [RMANUtil.catalogBackup:741] Error while cataloging RMAN Backups: Cannot get RMANUtil
[Thread-63] [ 2019-07-26 16:27:42.896 WIB ] [RmanRestoreDatafilesStep.executeImpl:171] exception renaming datafiles oracle.sysman.assistants.util.rmanEngine.RMANFatalErrorException: Error while cataloging RMAN Backups
[Thread-63] [ 2019-07-26 16:27:42.896 WIB ] [BasicStep.configureSettings:383] messageHandler being set=oracle.sysman.assistants.util.InteractiveMessageHandler@6f449889
[Thread-70] [ 2019-07-26 16:27:42.901 WIB ] [RMANEngine.run:841] Return Value from readSqlOutput=null
[Thread-63] [ 2019-07-26 16:27:42.896 WIB ] [BasicStep.configureSettings:383] messageHandler being set=oracle.sysman.assistants.util.InteractiveMessageHandler@6f449889
[Thread-63] [ 2019-07-26 16:27:42.906 WIB ] [StepContext$ModeRunner.run:2961] Error while cataloging RMAN Backups
oracle.sysman.assistants.dbca.backend.RmanRestoreDatafilesStep.executeImpl(RmanRestoreDatafilesStep.java:172)
oracle.sysman.assistants.util.step.BasicStep.execute(BasicStep.java:278)
oracle.sysman.assistants.util.step.BasicStep.callStep(BasicStep.java:330)
oracle.sysman.assistants.dbca.backend.CloneRmanRestoreStep.executeImpl(CloneRmanRestoreStep.java:391)
oracle.sysman.assistants.util.step.BasicStep.execute(BasicStep.java:278)
oracle.sysman.assistants.util.step.Step.execute(Step.java:135)
oracle.sysman.assistants.util.step.StepContext$ModeRunner.run(StepContext.java:2941)
java.lang.Thread.run(Thread.java:745)
And the dbca closed. I'm still new to oracle DB and self-taught, so how do I solve this?