Oracle 常用环境变量查询

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;
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