May someone tell me something about the thread

Question

The ODP.NET document seems to have little words about the thread,or maybe it is the database who deals with the thread. i have some question aboue it.
I define a variable in a package specification,
CREATE OR REPLACE PACKAGE TSTpkg
is
counter NUMBER DEFAULT 0;
END TSTpkg;
then deal with it in a function
FUNCTION addc RETURN NUMBER
AS
cnt NUMBER:=0;
BEGIN
LOOP
EXIT WHEN admin.tstpkg.counter>100;
tstpkg.counter:=admin.tstpkg.counter+1;
cnt:=cnt+1;
END LOOP;
RETURN cnt;
the cnt indicate the number the loop runs,in a single thread program,it will always return 100,for counter is default by 0.Then in C#, i wrote a methord to invoke the funciton"addc" and return the value the function"addc" returns.As far as I am concerned,the variable defined in the package specification should be seen as static element,so if two thread access it, there is just one counter,and the sum of the values return by the two methords invoked in two threads should be 100. But the result is each of the thread returns 100.
How does the database treat the variable defined in the package specification on the earh?And shouldn't I see it as static one ?
Who can tell me truth?3ks very much
(PS: I am Chinese, please forgive me poor engilsh)

Answer 1

Hi,
Each database session gets it's own copy of plsql package variables, they're not shared between sessions.
Cheers
Greg