Get Oracle SID in PL/SQL with out a query

Hi,
Is there any way where I can get ORACLE SID valuein
the PL/SQL layer with out actually querying
v$database tables.
I am looking for key word in PL/SQL which stores
currect SID name, just like how keyword 'user'stores
the current user who has logged in.Subtle correction ...
[url=http://download-east.oracle.com/docs/cd/B19306_01
/appdev.102/b14261/subprograms.htm#sthref1776]'user'
is a built-in function provided by Oracle. Why don't you create your own function to perform the
Select?
I know I can create a function but, I dont want to read the table everytime it is called. Knowing that Database sid is going to be constant for next couple of years.
The procedure in which I am going to use database sid is called for almost every transaction in the database. I am trying to avoid IO operation for a constant value. I cant declare a global constant as it is going to be different for each environment Dev, QA, Production etc..and we are looking to deploy same code for all the environments. We are anticipating to have multiple databases for production too.

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Get Oracle SID in PL/SQL with out a query

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