Troubleshooting macOS

Test cx_Oracle in Python

Use the following instructions to test the installaion of cx_Oracle

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Open the “Python 3.5 (64-bit)” application from the windows start menu.

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Run the following commands in Python:

import cx_Oracle
con = cx_Oracle.connect('username/password@hostname/instance')
print con.version
# Expcect to see "12.1.0.2.0"
con.close()

ORA-21561: OID generation failed

In macOS, You might see the following error :

sqlalchemy.exc.DatabaseError: (cx_Oracle.DatabaseError) ORA-21561: OID generation failed

This is caused by the macOS hostname under “sharing” not matching the name in /etc/hosts

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Run hostname to get the name of the mac :

Synerty-256:build-web jchesney$ hostname
syn256.local

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Confirm that it matches the hostnames for 127.0.0.1 and ::1 in /etc/hosts :

Synerty-256:build-web jchesney$ cat /etc/hosts
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1       localhost syn256.local
255.255.255.255 broadcasthost
::1             localhost syn256.local