An attempt was made to connect to the database using the SQLDBC_Connection::connect method, but no name was specified for the database instance.
Enter the name of the database instance in the properties of the SQLDBC_Connection::connect method:
f you want to establish the connection using the KEY property,
use the XUSER list
command to check whether
an XUSER entry exists for the database instance.
If you want to establish the connection using the KEY=SQLOPT property, check whether the -d <database_name> option was set in the SQLOPT environment variables.