Userenv () in Oracle

1.USEREVN ()

To return information about the current user environment, opt can be:
Entryid,sessionid,terminal,isdba,lable,language,client_info,lang,vsize

1.ISDBA See if the current user is a DBA if yes returns true
Sql> Select Userenv (' Isdba ') from dual;

Useren
------
FALSE

2.SESSION Return to Session flag

Sql> Select Userenv (' SessionID ') from dual;

USERENV (' SESSIONID ')
--------------------
152

4.ENTRYID Return session population flag

Sql> Select Userenv (' EntryID ') from dual;

USERENV (' ENTRYID ')
------------------
0

5.INSTANCE returns the current INSTANCE flag
Sql> Select Userenv (' instance ') from dual;

USERENV (' INSTANCE ')
-------------------
1

6.LANGUAGE returns the current environment variable
Sql> Select Userenv (' language ') from dual;

USERENV (' LANGUAGE ')
----------------------------------------------------
Simplified Chinese_china. Zhs16gbk

7.LANG returns the abbreviation for the language of the current environment
Sql> Select Userenv (' Lang ') from dual;

USERENV (' LANG ')
----------------------------------------------------
ZHS

8.TERMINAL return the logo of the user's Terminal or machine
Sql> Select Userenv (' Terminal ') from dual;

USERENV (' Termina
----------------
GAO

9.VSIZE (x) returns the size (in bytes) of X
Sql> Select Vsize (user), user from dual;

Vsize (user) User
----------- ------------------------------
6 SYSTEM

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;

Userenv () in Oracle