The PDO_OCI Data Source Name (DSN) is composed of the following elements:
DSN prefix
The DSN prefix is oci:.
dbname (Oracle Instant Client)
The URI for the Oracle Instant Client connection takes the form of
dbname=//hostname:port-number/database.
If you are connecting to a database defined in
tnsnames.ora, use only the name of the database:
dbname=database.
charset
The client-side character set for the current environment handle.
Examples
Example 1. PDO_OCI DSN examples
The following examples show a PDO_OCI DSN for connecting to
Oracle databases: