Unique id for calling thread

Question

A stored proc can be called by any of the say 200 threads from within a pool of java connections that all sign on with say USER1. Another similar pool can call the same proc that are signed on with USER2. Inside the proc I need to store some SYS_CONTEXT info and retrive it within the same call. I cannot use a package HEADER variable beacuse this is not private to the thread. I cannot use a global variable in the package BODY because between storing the value in the BDY global variable and retrieving it another thread can call the same proc and access the BODY global variable.
I decide to store in the info ina SYS_CONTEXT using a unique identifier for this thread as the ATTRIBUTE and the info in the VALUE. To compose the unique id for this thread I can issue the following SQl. Which combo will guarantee me a unique id for tis thread that called the stored proc. The calls are synchronous meaning once a thread obtains a connection from the pool to call the stored proc it does not give it up until the proc completes and returns a result to the thread.
SELECT
SYS_CONTEXT('USERENV','SESSIONID')
,SYS_CONTEXT('USERENV','SESSION_USER')
,SYS_CONTEXT('USERENV','SESSION_USERID')
, ,SYS_CONTEXT('USERENV','SID')
,SYS_CONTEXT('USERENV','HOST')
,SYS_CONTEXT('USERENV','INSTANCE')
INTO
v_sessionid
,v_session_user
,v_session_userid
,v_host
,v_instance
FROM
DUAL
;

Answer 1

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