Start, restart, stop and status stored procedure - howto?

First:
- this and other otn forums are awesome!
- apex is neat
Second:
- I have O'Reilly books: "Oracle pl/sql programming" and "Mastering Oracle SQL"
- Also tried to search / google best practices around stopping 'hanging stored procedures' and creating logics for such happening
Challenge:
I would like to implement simple solution for starting, stopping, restarting and maybe even getting status of stored procedures. Sounds like unix runlevels but in "userspace" without the sys rights.
Finally I would like to have this functionality in apex-application where predefines stored procedures could be started, restarted, stopped and maybe even status could be retrieved.
start - this is simple, start - but maybe check if such stored procedure is already started ( so this start will fail)
stop - send signal to certain procedure(s) that now it/they should exit immediately
restart - actually stop+start
status - maybe via status table indicating e.g. records_processed/records_to_be_processed
Mostly I need this stop so what would be the best way to write "exit" for stored procedure? I would like to avoid the following approach:
SELECT sid, serial# , username, schemaname, osuser FROM gv$session;
ALTER SYSTEM KILL SESSION '<sid>,<serial#>' IMMEDIATE;
/paavo
Edited by: paavo on Jul 13, 2009 11:35 AM - added status to subject :)

paavo wrote:
Thank you, very good references, but still I think my challenge persist on stop still because I try to do this without the rights to v$session etc. tables.
So what would be the best way to deliver stop-message to executing stored procedure. E.g.
- via table which is regularly checked by stored procedure (e.g. in loop it selects from the table)
/paavoI think for stopping such a procedure you have only two sensible possibilities.
First option is to kill the session. For this you or the logic that does the kill needs the appropriate rights to do it.
Second option would be to programm this behaviour. The procedure can listen to a kind of signal and if it gets that signal it is stopped. This signal can be a value in a parameter table, but it can also be a message in some pipe/advanced queue. However this means the procedure will stop only at certain defined points (whenever it checks for the stop signal).
Btw: You didn't mention what is the business case behind that technical request. Maybe you can elaborate a little on that too.

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Start, restart, stop and status stored procedure - howto?

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