1. Check the major Oracle network files file location within Oracle Home List the file name Give the Oracle SID/Service ID, home name, port number, and protocol Run following command under command line, and post your results: Solution Overview of Oracle Net Listener Configuration File Oracle Net Listener configuration, stored in the listener.ora file, consists of the following elements: Name of the listener Protocol addresses that the listener is accepting connection requests on Database services Control parameters Dynamic service registration, eliminates the need for static configuration of supported services. However, static service configuration is required if you plan to use Oracle Enterprise Manager. By default, the listener.ora file is located in the ORACLE_HOME/network/admin directory. The listener.ora file can also be stored the following locations: The directory specified by the TNS_ADMIN environment variable or registry value On Linux and UNIX operating systems, the global configuration directory. For example, on the Solaris Operating System, this directory is /var/opt/oracle. Need to set ORACLE_SID of a database. What if the person who installed database can\'t remember what it was, is it the same as the instance_name in the init.ora file? ORACLE_SID is the instance name, check init.ora for instance_name parameter. Check /etc/oratab file (or depending on Oracle version /var/opt/oracle/oratab) for a list of instances on the server. ORACLE_SID MAY BE or MAY NOT BE the same as the database name, check init.ora for db_name parameter .

1. 1. Check the major Oracle network
files file location within Oracle Home
List the file name
Give the Oracle SID/Service ID, home name, port number, and protocol
Run following command under command line, and post your results:
Solution
Overview of Oracle Net Listener Configuration File
Oracle Net Listener configuration, stored in the listener.ora file, consists of the following
elements:
Name of the listener
Protocol addresses that the listener is accepting connection requests on
Database services
Control parameters
Dynamic service registration, eliminates the need for static configuration of supported services.
However, static service configuration is required if you plan to use Oracle Enterprise Manager.
By default, the listener.ora file is located in the ORACLE_HOME/network/admin directory. The
listener.ora file can also be stored the following locations:
The directory specified by the TNS_ADMIN environment variable or registry value
On Linux and UNIX operating systems, the global configuration directory. For example, on the
Solaris Operating System, this directory is /var/opt/oracle.

2. Need to set ORACLE_SID of a database.
What if the person who installed database can't remember what it was, is it the same as
the instance_name in the init.ora file?
ORACLE_SID is the instance name, check init.ora for instance_name parameter.
Check /etc/oratab file (or depending on Oracle version /var/opt/oracle/oratab) for a list of
instances on the server.
ORACLE_SID MAY BE or MAY NOT BE the same as the database name, check init.ora for
db_name parameter