oracle instant client is database access binaries for data access. They are typically installed on machines where you need to query an oracle database.
I have never used this node but a quick bit of investigation lead me to this...
This specifies the directory containing the Oracle Client libraries. If
libDiris not specified, the default library search mechanism is used. If your client libraries are in a full Oracle Client or Oracle Database installation, such as Oracle Database “XE” Express Edition, then you must have previously set environment variables likeORACLE_HOMEbefore callinginitOracleClient(). On Windows, remember to double each backslash used as a directory separator. See Locating the Oracle Client Libraries.
So if you have not installed the oracle instant client, do so and make note of where it is installed. If you have already installed oracle instant client, then enter the directory path of where it is installed into the node config.
Thats all the help i can offer i'm afraid.
If you need more help, then try contacting the nodes author.
