In BI-Admin Tool, Look at SYSTEM SESSION VARIABLE = ‘RUNAS’
It has an Initialization Block = ‘Set_RUNAS’ (Select ‘dummy’ from dual)
In DNC_DW schema, table W_PROXY_ACTAS has 3 columns:
PROXY_USER_ID = ‘WEBLOGIC’
PROXY_TARGET_ID = ‘VC-XYZ’
PROXY_LEVEL = ‘FULL’
For more information see this: