Report with sys_context/user_env context values.
Source: http://stackoverflow.com/questions/8114453/read-all-parameters-from-sys-context-userenv

Page

Name
	Page ID	1051
	Name	(PL)SQL - Sys_context

Region

Identification
	Sequence	10
	Title	Sys_context
	Type	Interactive Report
Source
	Source Type	DYNAMIC_QUERY
	Region Source	select res.* from ( select * from ( select sys_context ('userenv','ACTION') ACTION, sys_context ('userenv','AUDITED_CURSORID') AUDITED_CURSORID, sys_context ('userenv','AUTHENTICATED_IDENTITY') AUTHENTICATED_IDENTITY, sys_context ('userenv','AUTHENTICATION_DATA') AUTHENTICATION_DATA, sys_context ('userenv','AUTHENTICATION_METHOD') AUTHENTICATION_METHOD, sys_context ('userenv','BG_JOB_ID') BG_JOB_ID, sys_context ('userenv','CLIENT_IDENTIFIER') CLIENT_IDENTIFIER, sys_context ('userenv','CLIENT_INFO') CLIENT_INFO, sys_context ('userenv','CURRENT_BIND') CURRENT_BIND, sys_context ('userenv','CURRENT_EDITION_ID') CURRENT_EDITION_ID, sys_context ('userenv','CURRENT_EDITION_NAME') CURRENT_EDITION_NAME, sys_context ('userenv','CURRENT_SCHEMA') CURRENT_SCHEMA, sys_context ('userenv','CURRENT_SCHEMAID') CURRENT_SCHEMAID, sys_context ('userenv','CURRENT_SQL') CURRENT_SQL, sys_context ('userenv','CURRENT_SQLn') CURRENT_SQLn, sys_context ('userenv','CURRENT_SQL_LENGTH') CURRENT_SQL_LENGTH, sys_context ('userenv','CURRENT_USER') CURRENT_USER, sys_context ('userenv','CURRENT_USERID') CURRENT_USERID, sys_context ('userenv','DATABASE_ROLE') DATABASE_ROLE, sys_context ('userenv','DB_DOMAIN') DB_DOMAIN, sys_context ('userenv','DB_NAME') DB_NAME, sys_context ('userenv','DB_UNIQUE_NAME') DB_UNIQUE_NAME, sys_context ('userenv','DBLINK_INFO') DBLINK_INFO, sys_context ('userenv','ENTRYID') ENTRYID, sys_context ('userenv','ENTERPRISE_IDENTITY') ENTERPRISE_IDENTITY, sys_context ('userenv','FG_JOB_ID') FG_JOB_ID, sys_context ('userenv','GLOBAL_CONTEXT_MEMORY') GLOBAL_CONTEXT_MEMORY, sys_context ('userenv','GLOBAL_UID') GLOBAL_UID, sys_context ('userenv','HOST') HOST, sys_context ('userenv','IDENTIFICATION_TYPE') IDENTIFICATION_TYPE, sys_context ('userenv','INSTANCE') INSTANCE, sys_context ('userenv','INSTANCE_NAME') INSTANCE_NAME, sys_context ('userenv','IP_ADDRESS') IP_ADDRESS, sys_context ('userenv','ISDBA') ISDBA, sys_context ('userenv','LANG') LANG, sys_context ('userenv','LANGUAGE') LANGUAGE, sys_context ('userenv','MODULE') MODULE, sys_context ('userenv','NETWORK_PROTOCOL') NETWORK_PROTOCOL, sys_context ('userenv','NLS_CALENDAR') NLS_CALENDAR, sys_context ('userenv','NLS_CURRENCY') NLS_CURRENCY, 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','NLS_TERRITORY') NLS_TERRITORY, sys_context ('userenv','OS_USER') OS_USER, sys_context ('userenv','POLICY_INVOKER') POLICY_INVOKER, sys_context ('userenv','PROXY_ENTERPRISE_IDENTITY') PROXY_ENTERPRISE_IDENTITY, sys_context ('userenv','PROXY_USER') PROXY_USER, sys_context ('userenv','PROXY_USERID') PROXY_USERID, sys_context ('userenv','SERVER_HOST') SERVER_HOST, sys_context ('userenv','SERVICE_NAME') SERVICE_NAME, sys_context ('userenv','SESSION_EDITION_ID') SESSION_EDITION_ID, sys_context ('userenv','SESSION_EDITION_NAME') SESSION_EDITION_NAME, sys_context ('userenv','SESSION_USER') SESSION_USER, sys_context ('userenv','SESSION_USERID') SESSION_USERID, sys_context ('userenv','SESSIONID') SESSIONID, sys_context ('userenv','SID') SID, sys_context ('userenv','STATEMENTID') STATEMENTID, sys_context ('userenv','TERMINAL') TERMINAL from dual -- where sys_context ('userenv','SESSIONID') NOT in ('SYS', 'XDB') -- <<<<< filter by user ) unpivot include nulls ( val for name in (action, audited_cursorid, authenticated_identity, authentication_data, authentication_method, bg_job_id, client_identifier, client_info, current_bind, current_edition_id, current_edition_name, current_schema, current_schemaid, current_sql, current_sqln, current_sql_length, current_user, current_userid, database_role, db_domain, db_name, db_unique_name, dblink_info, entryid, enterprise_identity, fg_job_id, global_context_memory, global_uid, host, identification_type, instance, instance_name, ip_address, isdba, lang, language, module, network_protocol, nls_calendar, nls_currency, nls_date_format, nls_date_language, nls_sort, nls_territory, os_user, policy_invoker, proxy_enterprise_identity, proxy_user, proxy_userid, server_host, service_name, session_edition_id, session_edition_name, session_user, session_userid, sessionid, sid, statementid, terminal) ) ) res