SYS_CONTEXT

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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  from dual