SYS_CONTEXT is an Oracle function which can be used to retrieve useful information about the Oracle environment. This can be used both in SQL and PL/SQL.
WITH user_environment(param, param_value) AS
(
select 'AUDITED_CURSORID', SYS_CONTEXT('USERENV','AUDITED_CURSORID') from dual UNION ALL
select 'AUTHENTICATED_IDENTITY' , SYS_CONTEXT('USERENV','AUTHENTICATED_IDENTITY') from dual UNION ALL
select 'AUTHENTICATION_DATA' , SYS_CONTEXT('USERENV','AUTHENTICATION_DATA') from dual UNION ALL
select 'AUTHENTICATION_METHOD' , SYS_CONTEXT('USERENV','AUTHENTICATION_METHOD') from dual UNION ALL
select 'BG_JOB_ID' , SYS_CONTEXT('USERENV','BG_JOB_ID') from dual UNION ALL
select 'CLIENT_IDENTIFIER' , SYS_CONTEXT('USERENV','CLIENT_IDENTIFIER') from dual UNION ALL
select 'CLIENT_INFO' , SYS_CONTEXT('USERENV','CLIENT_INFO') from dual UNION ALL
select 'CURRENT_BIND' , SYS_CONTEXT('USERENV','CURRENT_BIND') from dual UNION ALL
select 'CURRENT_EDITION_ID' , SYS_CONTEXT('USERENV','CURRENT_EDITION_ID') from dual UNION ALL
select 'CURRENT_EDITION_NAME' , SYS_CONTEXT('USERENV','CURRENT_EDITION_NAME') from dual UNION ALL
select 'CURRENT_SCHEMA' , SYS_CONTEXT('USERENV','CURRENT_SCHEMA') from dual UNION ALL
select 'CURRENT_SCHEMAID' , SYS_CONTEXT('USERENV','CURRENT_SCHEMAID') from dual UNION ALL
select 'CURRENT_SQL' , SYS_CONTEXT('USERENV','CURRENT_SQL') from dual UNION ALL
select 'CURRENT_SQLn' , SYS_CONTEXT('USERENV','CURRENT_SQLn') from dual UNION ALL
select 'CURRENT_SQL_LENGTH' , SYS_CONTEXT('USERENV','CURRENT_SQL_LENGTH') from dual UNION ALL
select 'CURRENT_USER' , SYS_CONTEXT('USERENV','CURRENT_USER') from dual UNION ALL
select 'CURRENT_USERID' , SYS_CONTEXT('USERENV','CURRENT_USERID') from dual UNION ALL
select 'DATABASE_ROLE' , SYS_CONTEXT('USERENV','DATABASE_ROLE') from dual UNION ALL
select 'DB_DOMAIN' , SYS_CONTEXT('USERENV','DB_DOMAIN') from dual UNION ALL
select 'DB_NAME' , SYS_CONTEXT('USERENV','DB_NAME') from dual UNION ALL
select 'DB_UNIQUE_NAME' , SYS_CONTEXT('USERENV','DB_UNIQUE_NAME') from dual UNION ALL
select 'DBLINK_INFO' , SYS_CONTEXT('USERENV','DBLINK_INFO') from dual UNION ALL
select 'ENTRYID' , SYS_CONTEXT('USERENV','ENTRYID') from dual UNION ALL
select 'ENTERPRISE_IDENTITY' , SYS_CONTEXT('USERENV','ENTERPRISE_IDENTITY') from dual UNION ALL
select 'FG_JOB_ID' , SYS_CONTEXT('USERENV','FG_JOB_ID') from dual UNION ALL
select 'GLOBAL_CONTEXT_MEMORY' , SYS_CONTEXT('USERENV','GLOBAL_CONTEXT_MEMORY') from dual UNION ALL
select 'GLOBAL_UID' , SYS_CONTEXT('USERENV','GLOBAL_UID') from dual UNION ALL
select 'HOST' , SYS_CONTEXT('USERENV','HOST') from dual UNION ALL
select 'IDENTIFICATION_TYPE' , SYS_CONTEXT('USERENV','IDENTIFICATION_TYPE') from dual UNION ALL
select 'INSTANCE' , SYS_CONTEXT('USERENV','INSTANCE') from dual UNION ALL
select 'INSTANCE_NAME' , SYS_CONTEXT('USERENV','INSTANCE_NAME') from dual UNION ALL
select 'IP_ADDRESS' , SYS_CONTEXT('USERENV','IP_ADDRESS') from dual UNION ALL
select 'ISDBA' , SYS_CONTEXT('USERENV','ISDBA') from dual UNION ALL
select 'LANG' , SYS_CONTEXT('USERENV','LANG') from dual UNION ALL
select 'LANGUAGE' , SYS_CONTEXT('USERENV','LANGUAGE') from dual UNION ALL
select 'MODULE' , SYS_CONTEXT('USERENV','MODULE') from dual UNION ALL
select 'NETWORK_PROTOCOL' , SYS_CONTEXT('USERENV','NETWORK_PROTOCOL') from dual UNION ALL
select 'NLS_CALENDAR' , SYS_CONTEXT('USERENV','NLS_CALENDAR') from dual UNION ALL
select 'NLS_CURRENCY' , SYS_CONTEXT('USERENV','NLS_CURRENCY') from dual UNION ALL
select 'NLS_DATE_FORMAT' , SYS_CONTEXT('USERENV','NLS_DATE_FORMAT') from dual UNION ALL
select 'NLS_DATE_LANGUAGE' , SYS_CONTEXT('USERENV','NLS_DATE_LANGUAGE') from dual UNION ALL
select 'NLS_SORT' , SYS_CONTEXT('USERENV','NLS_SORT') from dual UNION ALL
select 'NLS_TERRITORY' , SYS_CONTEXT('USERENV','NLS_TERRITORY') from dual UNION ALL
select 'OS_USER' , SYS_CONTEXT('USERENV','OS_USER') from dual UNION ALL
select 'POLICY_INVOKER' , SYS_CONTEXT('USERENV','POLICY_INVOKER') from dual UNION ALL
select 'PROXY_ENTERPRISE_IDENTITY' , SYS_CONTEXT('USERENV','PROXY_ENTERPRISE_IDENTITY') from dual UNION ALL
select 'PROXY_USER' , SYS_CONTEXT('USERENV','PROXY_USER') from dual UNION ALL
select 'PROXY_USERID' , SYS_CONTEXT('USERENV','PROXY_USERID') from dual UNION ALL
select 'SERVER_HOST' , SYS_CONTEXT('USERENV','SERVER_HOST') from dual UNION ALL
select 'SERVER_NAME' , SYS_CONTEXT('USERENV','SERVICE_NAME') from dual UNION ALL
select 'SESSION_EDITION_ID' , SYS_CONTEXT('USERENV','SESSION_EDITION_ID') from dual UNION ALL
select 'SESSION_EDITION_NAME' , SYS_CONTEXT('USERENV','SESSION_EDITION_NAME') from dual UNION ALL
select 'SESSION_USER' , SYS_CONTEXT('USERENV','SESSION_USER') from dual UNION ALL
select 'SESSION_USERID' , SYS_CONTEXT('USERENV','SESSION_USERID') from dual UNION ALL
select 'SESSIONID' , SYS_CONTEXT('USERENV','SESSIONID') from dual UNION ALL
select 'SID' , SYS_CONTEXT('USERENV','SID') from dual UNION ALL
select 'STATEMENTID' , SYS_CONTEXT('USERENV','STATEMENTID') from dual UNION ALL
select 'TERMINAL' , SYS_CONTEXT('USERENV','TERMINAL') from dual
)
---------
SELECT
param,
param_value
FROM user_environment;
Simply Oracle. 