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SnapSync Fails With ORA-12547: TNS:lost contact (KBA8873)

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KBA

KBA# 8873

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Major Release All Sub Releases
6.0 6.0.0.0, 6.0.1.0, 6.0.1.1, 6.0.2.0, 6.0.2.1, 6.0.3.0, 6.0.3.1, 6.0.4.0, 6.0.4.1, 6.0.4.2, 6.0.5.0, 6.0.6.0, 6.0.6.1, 6.0.7.0, 6.0.8.0, 6.0.8.1, 6.0.9.0, 6.0.10.0, 6.0.10.1, 6.0.11.0, 6.0.12.0, 6.0.12.1

5.3

 5.3.0.0, 5.3.0.1, 5.3.0.2, 5.3.0.3, 5.3.1.0, 5.3.1.1, 5.3.1.2, 5.3.2.0, 5.3.3.0, 5.3.3.1, 5.3.4.0, 5.3.5.0, 5.3.6.0, 5.3.7.0, 5.3.7.1, 5.3.8.0, 5.3.8.1, 5.3.9.0

5.2

5.2.2.0, 5.2.2.1, 5.2.3.0, 5.2.4.0, 5.2.5.0, 5.2.5.1, 5.2.6.0, 5.2.6.1

5.1

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5.0

5.0.1.0, 5.0.1.1, 5.0.2.0, 5.0.2.1, 5.0.2.2, 5.0.2.3, 5.0.3.0, 5.0.3.1, 5.0.4.0, 5.0.4.1, 5.0.5.0, 5.0.5.1, 5.0.5.2, 5.0.5.3, 5.0.5.4

Troubleshooting ORA-12547: TNS:lost contact during an Oracle SnapSync job

SnapSyncs of an Oracle dSource may fail with the following error displayed under the failed Actions tab in the Delphix GUI:

Error: Cannot connect to database due to: Exception occurred while getting connection: oracle.ucp.UniversalConnectionPoolException: Cannot get Connection from Datasource: java.sql.SQLException: ORA-12547: TNS:lost contact

Error Code: exception.oracle.accessor.database.failed.connection

Suggested Action: Make sure that the username provided has access rights to system views, and that the host server can be reached.

Diagnosing Information: Logged in through SSH from the Delphix Engine as "delphix_os" on host "nealrh8.acme.com".

Further review of the Delphix debug log, shows a detailed error like the following:

Recovery Manager: Release 19.0.0.0.0 - Production on Mon Feb 7 10:22:28 2022
Version 19.13.0.0.0

Copyright (c) 1982, 2019, 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>

Recovery Manager complete.

There are many possible reasons why this error may be raised (please refer to the links at the bottom of the article for additional suggestions). In this particular scenario there was an erroneous forward slash at the end of the ORACLE_HOME environment variable when the Oracle instance was started. If you try to connect to the Oracle instance from a different session without the extra forward slash in the ORACLE_HOME environment variable, the error will be raised.

We can demonstrate this outside of Delphix. In the following example, the Oracle instance was started with the erroneous forward slash appended to the end of the ORACLE_HOME environment variable. We can connect when our environment variable matches the error but not when the environment variable is defined correctly:

$ export ORACLE_HOME=/u01/app/oracle/product/19.7.0.0/dbhome_1/
$ sqlplus / as sysdba

SQL*Plus: Release 19.0.0.0.0 - Production on Tue Feb 8 12:20:58 2022
Version 19.7.0.0.0

Copyright (c) 1982, 2020, Oracle.  All rights reserved.


Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.7.0.0.0

SQL> Disconnected from Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.7.0.0.0


$ export ORACLE_HOME=/u01/app/oracle/product/19.7.0.0/dbhome_1
$ sqlplus / as sysdba

SQL*Plus: Release 19.0.0.0.0 - Production on Tue Feb 8 12:20:43 2022
Version 19.7.0.0.0

Copyright (c) 1982, 2020, Oracle.  All rights reserved.

ERROR:
ORA-12547: TNS:lost contact


Enter user-name:
$

Prerequisites 

If you have sufficient permission, you can examine the Oracle instance's environment variables to see if there is an erroneous slash. Commands to view a running process's environment variables vary by platform. On Linux, it can be done like this:

$ ps -ef | grep pmon
oracle    1515     1  0  2021 ?        00:12:58 ora_pmon_CDOMLOSRE2EC
oracle    1884     1  0  2021 ?        00:11:54 ora_pmon_CDOMSHSRB0B0
oracle    3024  2873  0 12:24 pts/1    00:00:00 grep --color=auto pmon
oracle   32567     1  0 11:42 ?        00:00:00 ora_pmon_DBOMSRB27546
$ strings -a /proc/32567/environ | grep ORACLE
ORACLE_SID=DBOMSRB27546
ORACLE_BASE=/u01/app/oracle
ORACLE_HOME=/u01/app/oracle/product/19.7.0.0/dbhome_1/
ORACLE_SPAWNED_PROCESS=1

Resolution

To resolve the "ORA-12547: TNS:lost contact" error:

  1. Shutdown the Oracle instance.
  2. Remove the erroneous forward slash from the environment variable, shell profiles, scripts used to start the database, the listener inside SRVCTL, /etc/oratab, et cetera.
  3. Restart the Oracle instance.
  4. Under the Delphix Manage > Environments menu, you may refresh the environment hosting the database. 
    This step is optional but recommended in case there are changes made to the environment that Delphix should be aware of.
  5. Run the SnapSync again from Delphix.

Related Articles

The following articles may provide more information or related information to this article: 

 

 

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