SELECT SYS_CONTEXT ('USERENV', 'TERMINAL') TERMINAL,
SYS_CONTEXT ('USERENV', 'LANGUAGE') LANGUAGE,
SYS_CONTEXT ('USERENV', 'SESSIONID') SESSIONID,
SYS_CONTEXT ('USERENV', 'INSTANCE') INSTANCE,
SYS_CONTEXT ('USERENV', 'ENTRYID') ENTRYID,
SYS_CONTEXT ('USERENV', 'ISDBA') ISDBA,
SYS_CONTEXT ('USERENV', 'NLS_TERRITORY') NLS_TERRITORY,
SYS_CONTEXT ('USERENV', 'NLS_CURRENCY') NLS_CURRENCY,
SYS_CONTEXT ('USERENV', 'NLS_CALENDAR') NLS_CALENDAR,
SYS_CONTEXT ('USERENV', 'NLS_DATE_FORMAT') NLS_DATE_FORMAT,
SYS_CONTEXT ('USERENV', 'NLS_DATE_LANGUAGE') NLS_DATE_LANGUAGE,
SYS_CONTEXT ('USERENV', 'NLS_SORT') NLS_SORT,
SYS_CONTEXT ('USERENV', 'CURRENT_USER') CURRENT_USER,
SYS_CONTEXT ('USERENV', 'CURRENT_USERID') CURRENT_USERID,
SYS_CONTEXT ('USERENV', 'SESSION_USER') SESSION_USER,
SYS_CONTEXT ('USERENV', 'SESSION_USERID') SESSION_USERID,
SYS_CONTEXT ('USERENV', 'PROXY_USER') PROXY_USER,
SYS_CONTEXT ('USERENV', 'PROXY_USERID') PROXY_USERID,
SYS_CONTEXT ('USERENV', 'DB_DOMAIN') DB_DOMAIN,
SYS_CONTEXT ('USERENV', 'DB_NAME') DB_NAME,
SYS_CONTEXT ('USERENV', 'HOST') HOST,
SYS_CONTEXT ('USERENV', 'OS_USER') OS_USER,
SYS_CONTEXT ('USERENV', 'EXTERNAL_NAME') EXTERNAL_NAME,
SYS_CONTEXT ('USERENV', 'IP_ADDRESS') IP_ADDRESS,
SYS_CONTEXT ('USERENV', 'NETWORK_PROTOCOL') NETWORK_PROTOCOL,
SYS_CONTEXT ('USERENV', 'BG_JOB_ID') BG_JOB_ID,
SYS_CONTEXT ('USERENV', 'FG_JOB_ID') FG_JOB_ID,
SYS_CONTEXT ('USERENV', 'AUTHENTICATION_TYPE') AUTHENTICATION_TYPE,
SYS_CONTEXT ('USERENV', 'AUTHENTICATION_DATA') AUTHENTICATION_DATA,
SYS_CONTEXT ('USERENV', 'CURRENT_SQL') CURRENT_SQL,
SYS_CONTEXT ('USERENV', 'CLIENT_IDENTIFIER') CLIENT_IDENTIFIER,
SYS_CONTEXT ('USERENV', 'GLOBAL_CONTEXT_MEMORY') GLOBAL_CONTEXT_MEMORY
FROM DUAL;

Bu script 11gR1 ve 11gR2 ‘de test edilmiştir. Lütfen scriptleri üretim ortamında çalıştırmadan önce test sunucularınızda test ediniz.