sys.database_name
SYS_CONTEXT('USERENV', 'CURRENT_SCHEMA')
SYS_CONTEXT('USERENV', 'HOST')
USER()
SYS_CONTEXT('USERENV', 'NLS_TERRITORY')
USERENV('LANG')
SYS_CONTEXT('USERENV', 'OS_USER')
SYS_CONTEXT('USERENV', 'NETWORK_PROTOCOL')
SYS_CONTEXT('USERENV', 'TERMINAL')
SYS_CONTEXT('USERENV', 'IP_ADDRESS')
SYS_CONTEXT('USERENV', 'DB_DOMAIN') 
SYS_CONTEXT('USERENV', 'ISDBA')
SYS_CONTEXT('USERENV', 'AUTHENTICATION_DATA')
SYS_CONTEXT('USERENV', 'AUTHENTICATION_TYPE')