USERENV 和 SYS_CONTEXT

1、 USERENV(OPTION)
??　　返回当前的会话信息.
??　　OPTION='ISDBA'若当前是DBA角色,则为TRUE,否则FALSE.
??　　OPTION='LANGUAGE'返回数据库的字符集.
??　　OPTION='SESSIONID'为当前会话标识符.
??　　OPTION='ENTRYID'返回可审计的会话标识符.
??　　OPTION='LANG'返回会话语言名称的ISO简记.
??　　OPTION='INSTANCE'返回当前的实例.
??        PTION='terminal'返回当前计算机名
??　　SELECT USERENV('LANGUAGE') FROM DUAL;
??
??2、sys_context
??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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转载于:http://blog.itpub.net/785120/viewspace-220557/