How do SchedOra connect to the Oracle databse?

SchedOra uses standard Oracle Client software (OCI) and TNS name.
There are two prerequisites you need to solve: TNS name (respectively alias) is the name of the entry in tnsnames.ora file which is kept in $ORACLE_HOME/network/admin. TNS name describe the connection to Oracle database with using host name, port and other connection arguments. Please read more about the Oracle Client and TNS records here: What is TNS name on community.oracle.com and here: Database Client Installation Guide on docs.oracle.com
Do not remember you have to install correct 32 or 64 Bit version of ShedOra in depend the Bit version of the Oracle Client you have installed!

I have installed Oracle Instant Client but where is located TNSNAMES.ORA file?

When you install the InstantClient binaries, you often want to use your existing TNSNAMES.ORA file containing all your databases. So how do you specify the location of your TNSNAMES.ORA file?

The Oracle website has the answer:
Always set the TNS_ADMIN environment variable or registry to the location of the tnsnames.ora file (full directory path only, do not include the file name). This practice will ensure that you are using the appropriate tnsnames.ora for your application when running with Instant Client. For UNIX and Linux systems set the variable TNS_ADMIN like so in your .profile or .bash_profile:
export TNS_ADMIN=/opt/oracle/instantclient_11_2/

On Windows systems, set the environment variables via the Advanced System properties:
  1. Open CMD, enter sysdm.cpl
  2. In the Advanced tab, select Environment Variables.
  3. Under “System Variables”, click on New… and enter “TNS_ADMIN” as the name and the path where your TNSNAMES.ORA resides as your value.

Now, you can use your TNS names for your InstantClient.

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