parallel_instances 

This parameter is only relevant if you are using the Parallel Server option. See ORACLE Databases and Parallel Server Option.

The instances running in parallel to the dedicated database instance are defined by this parameter.

Default value: none.

parallel_instances = <inst_beschr>|(<inst_beschr1>,<inst_beschr2>,...)

<inst_descr>: <ORACLE_SID>:<ORACLE_HOME>@<connect_string>

<ORACLE_SID>: ORACLE System ID of the parallel instance

<ORACLE_HOME>: ORACLE_HOME directory of the parallel instance

<connect_string>: ORACLE Connect-String to the parallel instance

parallel_instances = (C11_002:/oracle/C11@T:hs0002:C11_002,C11_003:/oracle/C11@T:hs0003:C11_003)