Oracle中获取会话信息的两个函数分享

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.

OPTION='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

3.与系统视图v$session组合使用可以获得更多信息(客户端所使用的应用程序等)

select * 

  from v$session se, 

       (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) base 

 where se.AUDSID = base.sessionid;