Re: How do you set your dispatcher and server process parameters?
Date: 1996/01/11
Message-ID: <30F51928.317C_at_cincom.com>#1/1
Cherie Machler wrote:
>
> A section of a book I read about multi-threaded servers recommends
> that certain dispatcher and server process parameters be set
> "high" or "low" to allow for potential tuning. High and low are
> relative terms. Is high x + 10? Or x + 50? If so, what is x?
>
> Is low y - 5 or y - 10? If so, what is y?
>
> How do you set the following variables when you're setting up
> a multi-threaded server?
>
> MTS_MAX_DISPATCHER
> MTS_SERVERS
> MTS_MAX_SERVERS
On our system, which is currently a low usage system, we set MTS_MAX_DISPATCHERS and
MTS_MAX_SERVERS to 10, which I believe are just the defaults. MTS_SERVERS is set to
1, but should be higher if you have a busy system.
You then need to monitor your MTS statistics to see if things are operating efficiently or not. Here is a script I use to check things out. The first two queries show information about each dispatcher and dispatchers in each protocol, respectively. The last query shows information on each shared server.
I've not had much opportunity to interpret these results in a real system. But I think what you want to look for is a high busy rate on shared servers, indicating you may need more servers. And a high average wait per response on the dispatchers, indicating you need more dispatchers for that protocol.
Hope this all helps.
Brian
- File : MTS.SQL
- Purpose : Shows contention statistics for the multi-threaded server
- Params : None.
- Run As : SYS, SYSTEM or DBA account
SET PAGESIZE 999
SET FEEDBACK OFF
COLUMN network HEADING "PROTOCOL" FORMAT A8 COLUMN status FORMAT A10 COLUMN accept FORMAT A6 COLUMN idle HEADING "IDLE|(sec)" FORMAT 9,999,990.00 JUSTIFY LEFT COLUMN busy HEADING "BUSY|(sec)" FORMAT 9,999,990.00 JUSTIFY LEFT COLUMN busy_rate HEADING "Busy Rate|(%)" FORMAT 990.00 JUSTIFY LEFT
COLUMN connections HEADING "CONNECTIONS|(cur/total)" FORMAT A11 COLUMN avg_wait_time HEADING "Avg Wait Per Resp|(hundredths of secs)" FORMAT 990.00
PROMPT
PROMPT MTS Dispatcher Statistics
SELECT name, network, status, accept, owned || '/' || created AS connections,
(SUM(busy) / (SUM(busy) + SUM(idle))) * 100 AS busy_rate
FROM v$dispatcher
GROUP BY name, network, status, accept, owned, created
/
SELECT network,
DECODE(SUM(totalq), 0, 'No Response', SUM(wait) / SUM(totalq))
AS avg_wait_time
FROM v$queue q, v$dispatcher d
WHERE q.type = 'DISPATCHER' AND q.paddr = d.paddr GROUP BY network
/
- Begin Shared Server Statistics Section
COLUMN status FORMAT A16 COLUMN busy_pct HEADING "BUSY|(%)" FORMAT 990.00 JUSTIFY LEFT
PROMPT
PROMPT MTS Shared Server Statistics
SELECT name, status, circuit, idle / 100 AS idle, busy / 100 AS busy, requests,
(busy / (busy + idle)) * 100 AS busy_pct
FROM v$shared_server
/
CLEAR COLUMNS
CLEAR BREAKS
SET FEEDBACK ON
SET PAGESIZE 14
-- Brian M. Biggs mailto:bbiggs_at_cincom.com Cincom Systems, Inc. voice: (513) 677-7661 http://www.cincom.com/Received on Thu Jan 11 1996 - 00:00:00 CET